Rep. Norm Thurston — Voting Record

Bill

Number

H.B. 54 (2020GS)

Sponsor

Rep. Snider, C.

Final action

Governor Signed 3/24/2020

Outcome

Became law — signed by Gov. Gary R. Herbert

Summary

What it does

• This bill:
• amends the definition of the State Construction Code to include standards for the use of mass timber products;
• enacts building standards for the use of mass timber products for residential and commercial building construction; and
• makes technical and conforming changes.

Every vote on this bill

Bill text

BUILDING CONSTRUCTION AMENDMENTS
GENERAL SESSION
STATE OF UTAH
Chief Sponsor: Casey Snider
Senate Sponsor: 
Curtis S. Bramble
LONG TITLE
General Description:
This bill amends the State Construction and Fire Codes Act and enacts provisions
regarding the use of mass timber products.
Highlighted Provisions:
This bill:
▸ amends the definition of the State Construction Code to include standards for the
use of mass timber products;
▸ enacts building standards for the use of mass timber products for residential and
commercial building construction; and
▸ makes technical and conforming changes.
Money Appropriated in this Bill:
None
Other Special Clauses:
None
Utah Code Sections Affected:
AMENDS:
15A-1-102
, as enacted by Laws of Utah 2011, Chapter 14
15A-2-101
, as enacted by Laws of Utah 2011, Chapter 14
15A-2-102
, as last amended by Laws of Utah 2016, Chapter 249
ENACTS:
15A-2a-101
, Utah Code Annotated 1953
15A-2a-102
, Utah Code Annotated 1953
15A-2a-201
, Utah Code Annotated 1953
15A-2a-202
, Utah Code Annotated 1953
15A-2a-203
, Utah Code Annotated 1953
15A-2a-204
, Utah Code Annotated 1953
15A-2a-301
, Utah Code Annotated 1953
15A-2a-302
, Utah Code Annotated 1953
15A-2a-401
, Utah Code Annotated 1953
Be it enacted by the Legislature of the state of Utah:
Section 1. Section 
15A-1-102
 is amended to read:
15A-1-102.
Definitions.
As used in this title:
(1) "Board" means the Utah Fire Prevention Board created in Section 
53-7-203
.
(2) "Division" means the Division of Occupational and Professional Licensing created
in Section 
58-1-103
, except as provided in:
(a) Part 4, State Fire Code Administration Act; and
(b) Chapter 5, State Fire Code Act.
(3) "State Construction Code" means the State Construction Code adopted by:
(a) Chapter 2, Adoption of State Construction Code;
(b) Chapter 2a, Tall Wood Buildings of Mass Timber Construction Incorporated as
Part of State Construction Code;
[
(b)
] 
(c)
 Chapter 3, Statewide Amendments Incorporated as Part of State Construction
Code; [
and
]
[
(c)
] 
(d)
 Chapter 4, Local Amendments Incorporated as Part of State Construction
Code[
.
]
; and
(e) Chapter 6, Additional Construction Requirements.
(4) "State Fire Code" means the State Fire Code adopted by Chapter 5, State Fire Code
Act.
(5) "Utah Code" means the Utah Code Annotated (1953), as amended.
Section 2. Section 
15A-2-101
 is amended to read:
15A-2-101.
Title -- Adoption of code.
(1) This chapter is known as the "Adoption of State Construction Code."
(2) In accordance with Chapter 1, Part 2, State Construction Code Administration Act,
the Legislature repeals the State Construction Code in effect on July 1, 2010, and adopts the
following as the State Construction Code:
(a) this chapter;
(b) Chapter 2a, Tall Wood Buildings of Mass Timber Construction Incorporated as
Part of State Construction Code;
[
(b)
] 
(c)
 Chapter 3, Statewide Amendments Incorporated as Part of State Construction
Code; [
and
]
[
(c)
] 
(d)
 Chapter 4, Local Amendments Incorporated as Part of State Construction
Code[
.
]
; and
(e) Chapter 6, Additional Construction Requirements.
Section 3. Section 
15A-2-102
 is amended to read:
15A-2-102.
Definitions.
As used in this chapter [
and
]
, Chapter 2a, Tall Wood Buildings of Mass Timber
Construction Incorporated as Part of State Construction Code,
 Chapter 3, Statewide
Amendments Incorporated as Part of State Construction Code, and Chapter 4, Local
Amendments Incorporated as Part of State Construction Code:
(1) "HUD Code" means the Federal Manufactured Housing Construction and Safety
Standards Act, as issued by the Department of Housing and Urban Development and published
in 24 C.F.R. Parts 3280 and 3282 (as revised April 1, 1990).
(2) "IBC" means the edition of the International Building Code adopted under Section
15A-2-103
.
(3) "IEBC" means the edition of the International Existing Building Code adopted
under Section 
15A-2-103
.
(4) "IECC" means the edition of the International Energy Conservation Code adopted
under Section 
15A-2-103
.
(5) "IFGC" means the edition of the International Fuel Gas Code adopted under
Section 
15A-2-103
.
(6) "IMC" means the edition of the International Mechanical Code adopted under
Section 
15A-2-103
.
(7) "IPC" means the edition of the International Plumbing Code adopted under Section
15A-2-103
.
(8) "IRC" means the edition of the International Residential Code adopted under
Section 
15A-2-103
.
(9) "NEC" means the edition of the National Electrical Code adopted under Section
15A-2-103
.
(10) "UWUI" means the edition of the Utah Wildland Urban Interface Code adopted
under Section 
15A-2-103
.
Section 4. Section 
15A-2a-101
 is enacted to read:
CHAPTER 2a. TALL WOOD BUILDINGS OF MASS TIMBER CONSTRUCTION
INCORPORATED AS PART OF STATE CONSTRUCTION CODE
Part 1. General Provisions
 15A-2a-101.
Title.
(1) This chapter is known as "Tall Wood Buildings of Mass Timber Construction
Incorporated as Part of State Construction Code."
(2) This chapter establishes building standards for the use of mass timber products in
residential and commercial building construction and is applicable statewide.
(3) Where this chapter replaces a section of the IBC that Chapter 3, Statewide
Amendments Incorporated as Part of State Construction Code, or Chapter 4, Local
Amendments Incorporated as Part of State Construction Code, amends, the amendment in
Chapter 3 or 4 shall apply to the IBC replacement in this chapter.
Section 5. Section 
15A-2a-102
 is enacted to read:
 15A-2a-102.
Definitions.
As used in this chapter:
(1) "Mass timber" means a structural element of Type IV construction primarily of
solid, built-up, panelized or engineered wood products that meet minimum cross section
dimensions of Type IV construction.
(2) "Non-combustible protection" (for mass timber) means non-combustible material in
accordance with IBC Section 703.5, designed to increase the fire-resistance rating and delay the
combustion of mass timber.
(3) "Wall, load-bearing" means any wall meeting either of the following classifications:
(a) any metal or wood stud wall that supports more than 100 pounds per linear foot
(1459 N/m) of vertical load in addition to its own weight; or
(b) any masonry or concrete, or mass timber wall that supports more than 200 pounds
per linear foot (2919 N/m) of vertical load in addition to its own weight.
Section 6. Section 
15A-2a-201
 is enacted to read:
Part 2. Statewide Amendments to International Building Code
 15A-2a-201.
Amendments to Chapter 4 of IBC.
In IBC, Section 403.3.2, is deleted and replaced with the following: "403.3.3 Water
supply to required fire pumps. In all buildings that are more than 420 feet (128m) in building
height, and buildings of Type IV-A and IV-B construction that are more than 120 feet in
building height, required fire pumps shall be supplied by connections to not fewer than two
water mains located in different streets. Separate supply piping shall be provided between each
connection to the water main and the pumps. Each connection and the supply piping between
the connection and the pumps shall be sized to supply the flow and pressure required for the
pumps to operate.
Exception: Two connections to the same main shall be permitted provided that the main
is valved such that an interruption can be isolated so that the water supply will continue
without interruption through not fewer than one of the connections."
Section 7. Section 
15A-2a-202
 is enacted to read:
 15A-2a-202.
Amendments to Chapter 5 of IBC.
(1) In IBC, Table 504.3, is deleted and replaced with the following: "Table 504.3
ALLOWABLE BUILDING HEIGHT IN FEET ABOVE GRADE PLANE
OCCUPANCY
CLASSIFICATION
TYPE OF CONSTRUCTION
SEE
FOOTNOTES
TYPE I
TYPE
II
TYPE
III
TYPE IV
TYPE V
A
B
A
B
A
B
A
B
C
HT
A
B
A, B, E, F, M, S, U
NS
b
UL
S
UL
H-1, H-2, H-3, H-5
NS
c, d
UL
S
H-4
NS
c, d
UL
S
UL
I-1 Condition 1, I-3
NS
d, e
UL
S
UL
I-1 Condition 2, I-2
NS
d, e, f
UL
S
UL
I-4
NS
d, g
UL
S
UL
R
h
NS
d
UL
S13D
S13R
S
UL
F
or SI: 1 foot = 304.8 mm
UL = Unlimited; NS = Buildings not equipped throughout with an automatic sprinkler
system; S = Buildings equipped throughout with an automatic sprinkler system installed in
accordance with Section 903.3.1.1; S13R = Buildings equipped throughout with an automatic
sprinkler system installed in accordance with Section 903.3.1.2; S13D = Buildings equipped
throughout with an automatic sprinkler system installed in accordance with Section 903.3.1.3.
a. See Chapters 4 and 5 for specific exceptions to the allowable height in this chapter.
b. See Section 903.2 for the minimum thresholds for protection by an automatic
sprinkler system for specific occupancies.
c. New Group H occupancies are required to be protected by an automatic sprinkler
system in accordance with Section 903.2.5.
d. The NS value is only for use in evaluation of existing building area in accordance
with the IEBC.
e. New Group I-1 and I-3 occupancies are required to be protected by an automatic
sprinkler system in accordance with Section 903.2.6. For new Group I-1 occupancies,
Condition 1, see Exception 1 of Section 903.2.6.
f. New and existing Group I-2 occupancies are required to be protected by an automatic
sprinkler system in accordance with Section 903.2.6 and Section 1103.5 of the International
Fire Code.
g. New Group I-4 occupancies see Exceptions 2 and 3 of Section 903.2.6.
h. New Group R occupancies are required to be protected by an automatic sprinkler
system in accordance with Section 903.2.8."
(2) In IBC, Table 504.4, "Allowable Number of Stories Above Grade Plane
a, b
" delete
Type IV and replace it with the following, in relation to the occupancy classification and
footnotes as indicated:
OCCUPANCY CLASSIFICATION
TYPE OF CONSTRUCTION
SEE FOOTNOTES
TYPE IV
A
B
C
HT
A-1
NS
S
A-2
NS
S
A-3
NS
S
A-4
NS
S
A-5
NS
UL
S
UL
UL
UL
UL
B
NS
S
E
NS
S
F-1
NS
S
F-2
NS
S
H-1
NS
c, d
NP
NP
NP
S
H-2
NS
c, d
S
H-3
NS
c, d
S
H-4
NS
c, d
S
H-5
NS
c, d
S
I-1 Condition 1
NS
d, e
S
I-1 Condition 2
NS
d, e
S
I-2
NS
d, f
NP
NP
NP
S
I-3
NS
d, e
S
I-4
NS
d, g
S
M
NS
S
R-1
h
NS
d
S13R
S
R-2
h
NS
d
S13R
S
R-3
h
NS
d
S13D
S13R
S
R-4
h
NS
d
S13D
S13R
S
S-1
NS
S
S-2
NS
S
U
NS
S
UL = Unlimited; NP = Not Permitted; NS = Buildings not equipped throughout with an
automatic sprinkler system; S = Buildings equipped throughout with an automatic sprinkler
system installed in accordance with Section 903.3.1.1; S13R = Buildings equipped throughout
with an automatic sprinkler system installed in accordance with Section 903.3.1.2; S13D =
Buildings equipped throughout with an automatic sprinkler system installed in accordance with
Section 903.3.1.3.
a. See Chapters 4 and 5 for specific exceptions to the allowable height in this chapter.
b. See Section 903.2 for the minimum thresholds for protection by an automatic
sprinkler system for specific occupancies.
c. New Group H occupancies are required to be protected by an automatic sprinkler
system in accordance with Section 903.2.5.
d. The NS value is only for use in evaluation of existing building height in accordance
with the IEBC.
e. New Group I-1 and I-3 occupancies are required to be protected by an automatic
sprinkler system in accordance with Section 903.2.6. For new Group I-1 occupancies,
Condition 1, see Exception 1 of Section 903.2.6.
f. New and existing Group I-2 occupancies are required to be protected by an automatic
sprinkler system in accordance with Sections 903.2.6 and 1103.5 of the International Fire
Code.
g. For new Group I-4 occupancies, see Exceptions 2 and 3 of Section 903.2.6.
h. New Group R occupancies are required to be protected by an automatic sprinkler
system in accordance with Section 903.2.8."
(3) In IBC, Table 506.2, "Allowable Area Factor (A
t
 = NS, S1, S13R, S13D or SM, as
applicable) in Square Feet
a, b
" delete Type IV and replace it with the following, in relation to the
occupancy classification and footnotes as indicated:
"OCCUPANCY
CLASSIFICATION
SEE
FOOTNOTES
TYPE OF CONSTRUCTION
TYPE IV
A
B
C
HT
A-1
NS
45,00
30,000
18,750
15,000
S1
180,0
120,000
75,000
60,000
SM
135,0
90,000
56,250
45,000
A-2
NS
45,00
30,000
18,750
15,000
S1
180,0
120,000
75,000
60,000
SM
135,0
90,000
56,250
45,000
A-3
NS
45,00
30,000
18,750
15,000
S1
180,0
120,000
75,000
60,000
SM
135,0
90,000
56,250
45,000
A-4
NS
45,00
30,000
18,750
15,000
S1
180,0
120,000
75,000
60,000
SM
135,0
90,000
56,250
45,000
A-5
NS
UL
UL
UL
UL
S1
SM
B
NS
108,0
72,000
45,000
36,000
S1
432,0
288,000
180,000
144,000
SM
324,0
216,000
135,000
108,000
E
NS
76,50
51,000
31,875
25,500
S1
306,0
204,000
127,500
102,000
SM
229,5
153,000
95,625
76,500
F-1
NS
100,5
67,000
41,875
33,500
S1
402,0
268,000
167,500
134,000
SM
301,5
201,000
125,625
100,500
F-2
NS
151,5
101,000
63,125
50,500
S1
606,0
404,000
252,500
202,000
SM
454,5
303,000
189,375
151,500
H-1
NS
c
10,50
10,500
10,500
10,500
S1
H-2
NS
c
10,50
10,500
10,500
10,500
S1
SM
H-3
NS
c
25,50
25,500
25,500
25,500
S1
SM
H-4
NS
c, d
72,00
54,000
40,500
36,000
S1
288,0
216,000
162,000
144,000
SM
216,0
162,000
121,500
108,000
H-5
NS
c, d
72,00
54,000
40,500
36,000
S1
288,0
216,000
162,000
144,000
SM
216,0
162,000
121,500
108,000
I-1
NS
d, e
54,00
36,000
18,000
18,000
S1
216,0
144,000
72,000
72,000
SM
162,0
108,000
54,000
54,000
I-2
NS
d, f
36,00
24,000
12,000
12,000
S1
144,0
96,000
48,000
48,000
SM
108,0
72,000
36,000
36,000
I-3
NS
d, e
36,00
24,000
12,000
12,000
S1
144,0
96,000
48,000
48,000
SM
108,0
72,000
36,000
36,000
I-4
NS
d, g
76,50
51,000
25,500
25,500
S1
306,0
204,000
102,000
102,000
SM
229,0
153,000
76,500
76,500
M
NS
61,50
41,000
25,625
20,500
S1
246,0
164,000
102,500
82,000
SM
184,5
123,000
76,875
61,500
R-1
h
NS
d
61,50
41,000
25,625
20,500
S13R
S1
246,0
164,000
102,500
82,000
SM
184,5
123,000
76,875
61,500
R-2
h
NS
d
61,50
41,000
25,625
20,500
S13R
S1
246,0
164,000
102,500
82,000
SM
184,5
123,000
76,875
61,500
R-3
h
NS
d
UL
UL
UL
UL
S13D
S13R
S1
SM
R-4
h
NS
d
61,50
41,000
25,625
20,500
S13D
S13R
S1
246,0
164,000
102,500
82,000
SM
184,5
123,000
76,875
61,500
S-1
NS
76,50
51,000
31,875
25,500
S1
306,0
204,000
127,500
102,000
SM
229,5
153,000
95,625
76,500
S-2
NS
115,5
77,000
48,125
38,500
S1
462,0
308,000
192,500
154,000
SM
346,5
308,000
144,375
115,500
U
NS
i
54,00
36,000
22,500
18,000
S1
216,0
144,000
90,000
72,000
SM
162,0
108,000
67,500
54,000
For SI: 1 square foot = 0.0929 m
.
UL = Unlimited; NP = Not Permitted; NS = Buildings not equipped throughout with an
automatic sprinkler system; S1 = Buildings a maximum of one story above grade plane
equipped throughout with an automatic sprinkler system installed in accordance with Section
903.3.1.1; SM = Buildings two or more stories above grade plane equipped throughout with an
automatic sprinkler system installed in accordance with Section 903.3.1.1; S13R = Buildings
equipped throughout with an automatic sprinkler system installed in accordance with Section
903.3.1.2; S13D = Buildings equipped throughout with an automatic sprinkler system installed
in accordance with Section 903.3.1.3.
a. See Chapters 4 and 5 for specific exceptions to the allowable height in this chapter.
b. See Section 903.2 for the minimum thresholds for protection by an automatic
sprinkler system for specific occupancies.
c. New Group H occupancies are required to be protected by an automatic sprinkler
system in accordance with Section 903.2.5.
d. The NS value is only for use in evaluation of existing building area in accordance
with the IEBC.
e. New Group I-1 and I-3 occupancies are required to be protected by an automatic
sprinkler system in accordance with Section 903.2.6. For new Group I-1 occupancies,
Condition 1, see Exception 1 of Section 903.2.6.
f. New and existing Group I-2 occupancies are required to be protected by an automatic
sprinkler system in accordance with Section 903.2.6 and Section 1103.5 of the International
Fire Code.
g. For New Group I-4 occupancies see Exceptions 2 and 3 of Section 903.2.6.
h. New Group R occupancies are required to be protected by an automatic sprinkler
system in accordance with Section 903.2.8.
i. The maximum allowable area for a single-story nonsprinklered Group U greenhouse
is permitted to be 9,000 square feet, or the allowable area shall be permitted to comply with
Table C102.1 of Appendix C."
(4) In IBC, Section 508.4.4 is deleted and replaced with the following: "508.4.4
Separation. Individual occupancies shall be separated from adjacent occupancies in accordance
with Table 508.4."
(5) In IBC, Section 508.4.4.1 is deleted and replaced with the following: "508.4.4.1
Construction. Required separations shall be fire barriers constructed in accordance with Section
or horizontal assemblies constructed in accordance with Section 711, or both, so as to
completely separate adjacent occupancies. Mass timber elements serving as fire barriers or
horizontal assemblies to separate occupancies in Type IV-B or IV-C construction shall be
separated from the interior of the building with an approved thermal barrier consisting of a
minimum of 1/2 inch (12.7 mm) gypsum board or a material that is tested in accordance with
and meets the acceptance criteria of both the Temperature Transmission Fire Test and the
Integrity Fire Test of NFPA 275."
(6) In IBC, Section 509, a new section is added as follows: "509.4.1.1 Type IV-B and
IV-C construction. Where Table 509 specifies a fire-resistance-rated separation, mass timber
elements serving as fire barriers or a horizontal assembly in Type IV-B or IV-C construction
shall be separated from the interior of the incidental use with an approved thermal barrier
consisting of a minimum of 1/2 inch (12.7 mm) gypsum board or a material that is tested in
accordance with and meets the acceptance criteria of both the Temperature Transmission Fire
Test and the Integrity Fire Test of NFPA 275."
Section 8. Section 
15A-2a-203
 is enacted to read:
 15A-2a-203.
Amendments to Chapter 6 of IBC.
(1) In IBC, Table 601 is deleted and replaced with the following:
"TABLE 601 FIRE-RESISTANCE RATING REQUIREMENTS FOR BUILDING
ELEMENTS (HOURS)
BUILDING ELEMENT
TYPE I
TYPE II
TYPE III
TYPE IV
TYPE V
A
B
A
B
A
B
A
B
C
HT
A
B
Primary structural frame
f
(see Section 202)
a, b
a, b
1b
1b
3a
2a
2a
HT
1b
Bearing walls
Exterior
e, f
Interior
a
a
1/HT
Nonbearing walls and
partitions Exterior
See Table 602
Nonbearing walls and
partitions Interior
d
See
Section
2304.1
1.2
Floor construction and
associated secondary
members (see Section
202)
HT
Roof construction and
associated secondary
members (see Section
202)
1/
b
b, c
b, c
c
b, c
1/2
HT
b, c
F
or SI: 1 foot = 304.8 mm.
a. Roof supports: Fire-resistance ratings of primary structural frame and bearing walls
are permitted to be reduced by 1 hour where supporting a roof only.
b. Except in Group F-1, H, M and S-1 occupancies, fire protection of structural
members in roof construction shall not be required, including protection of primary structural
frame members, roof framing and decking where every part of the roof construction is 20 feet
or more above any floor immediately below. Fire-retardant-treated wood members shall be
allowed to be used for such unprotected members.
c. In all occupancies, heavy timber complying with Section 2304.11 shall be allowed
where a 1-hour or less fire-resistance rating is required.
d. Not less than the fire-resistance rating required by other sections of this code.
e. Not less than the fire-resistance rating based on fire separation distance (see Table
602).
f. Not less than the fire-resistance rating as referenced in Section 704.10."
(2) In IBC, Table 602 is deleted and replaced with the following:
"TABLE 602 FIRE-RESISTANCE RATING REQUIREMENTS FOR EXTERIOR WALLS
BASED ON FIRE SEPARATION DISTANCE 
a, d, g
Fire Separation
Distance = X
(feet)
TYPE OF
CONSTRUCTI
ON
OCCUPANC
Y GROUP He
OCCUPANCY
GROUP F-1, M,
S-1f
OCCUPANCY
GROUP A, B,
F-2, I, R
i
, S-2,
U
h
 < 5b
All
≤ X < 10
IA, IVA
Others
≤ X < 30
IA, IB, IVA,
IVB
IIB, VB
Others
c
c
X ≥ 30
All
F
or SI: 1 foot = 304.8 mm.
a. Load-bearing exterior walls shall also comply with the fire-resistance rating
requirements of Table 601.
b. See Section 706.1.1 for party walls.
c. Open parking garages complying with Section 406 shall not be required to have a
fire-resistance rating.
d. The fire-resistance rating of an exterior wall is determined based upon the fire
separation distance of the exterior wall and the story in which the wall is located.
e. For special requirements for Group H occupancies, see Section 415.6.
f. For special requirements for Group S aircraft hangars, see Section 412.3.1.
g. Where Table 705.8 permits nonbearing exterior walls with unlimited area of
unprotected openings, the required fire-resistance rating for the exterior walls is 0 hours.
h. For a building containing only a Group U occupancy private garage or carport, the
exterior wall shall not be required to have a fire-resistance rating where the fire separation
distance is 5 feet (1523 mm) or greater.
i. For a Group R-3 building of Type II-B or Type V-B construction, the exterior wall
shall not be required to have a fire-resistance rating where the fire separation distance is 5 feet
(1523 mm) or greater."
(3) In IBC, Section 602.4 is deleted and replaced with the following: "602.4 Type IV.
Type IV construction is that type of construction in which the building elements are mass
timber or non-combustible materials and have fire-resistance ratings in accordance with Table
601. Mass timber elements shall meet the fire-resistance rating requirements of this section
based on either the fire-resistance rating of the non-combustible protection, the mass timber, or
a combination of both and shall be determined in accordance with Section 703.2 or 703.3. The
minimum dimensions and permitted materials for building elements shall comply with the
provisions of this section and Section 2304.11. Mass timber elements of Types IV-A, IV-B and
IV-C construction shall be protected with non-combustible protection applied directly to the
mass timber in accordance with Sections 602.4.1 through 602.4.3. The time assigned to the
non-combustible protection shall be determined in accordance with Section 703.8 and comply
with Section 722.7.
Cross-laminated timber shall be labeled as conforming to PRG 320-18 as referenced in
Section 2303.1.4.
Exterior load-bearing walls and nonload-bearing walls shall be mass timber
construction, or shall be of non-combustible construction.
Exception: Exterior load-bearing walls and nonload-bearing walls of Type IV-HT
Construction in accordance with Section 602.4.4.
The interior building elements, including nonload-bearing walls and partitions, shall be
of mass timber construction or of non-combustible construction.
Exception: Interior building elements and nonload-bearing walls and partitions of Type
IV-HT Construction in accordance with Section 602.4.4.
Combustible concealed spaces are not permitted except as otherwise indicated in
Sections 602.4.1 through 602.4.4. Combustible stud spaces within light frame walls of Type
IV-HT construction shall not be considered concealed spaces, but shall comply with Section
718.
In buildings of Type IV-A, B, and C, construction with an occupied floor located more
than 75 feet above the lowest level of fire department access, up to and including 12 stories or
feet above grade plane, mass timber interior exit and elevator hoistway enclosures shall be
protected in accordance with Section 602.4.1.2. In buildings greater than 12 stories or 180 feet
above grade plane, interior exit and elevator hoistway enclosures shall be constructed of
non-combustible materials."
(4) In IBC, Section 602.4.1 is deleted and replaced with the following: "602.4.1 Type
IV-A. Building elements in Type IV-A construction shall be protected in accordance with
Sections 602.4.1.1 through 602.4.1.6. The required fire-resistance rating of non-combustible
elements and protected mass timber elements shall be determined in accordance with Section
703.2 or Section 703.3."
(5) In IBC, Section 602, a new section is added as follows: "602.4.1.1 Exterior
Protection. The outside face of exterior walls of mass timber construction shall be protected
with non-combustible protection with a minimum assigned time of 40 minutes as determined
in Section 722.7.1. All components of the exterior wall covering shall be on non-combustible
material except water resistive barriers having a peak heat release rate of less than 150 kW/m
,
a total heat release of less than 20 MJ/m
 and an effective heat of combustion of less than 18
MJ/kg as determined in accordance with ASTM E1354 and having a flame spread index of 25
or less and a smoke-developed index of 450 or less as determined in accordance with ASTM
E84 or UL723. The ASTM E1354 test shall be conducted on specimens at the thickness
intended for use, in the horizontal orientation and at an incident radiant heat flux of 50
kW/m
."
(6) In IBC, Section 602, a new section is added as follows: "602.4.1.2 Interior
Protection. Interior faces of all mass timber elements, including the inside faces of exterior
mass timber walls and mass timber roofs, shall be protected with materials complying with
Section 703.5."
(7) In IBC, Section 602, a new section is added as follows: "602.4.1.2.1 Protection
Time. Non-combustible protection shall contribute a time equal to or greater than times
assigned in Table 722.7.1(1), but not less than 80 minutes. The use of materials and their
respective protection contributions listed in Table 722.7.1(2) shall be permitted to be used for
compliance with Section 722.7.1."
(8) In IBC, Section 602, a new section is added as follows: "602.4.1.3 Floors. The floor
assembly shall contain a non-combustible material not less than one inch in thickness above the
mass timber. Floor finishes in accordance with Section 804 shall be permitted on top of the
non-combustible material. The underside of floor assemblies shall be protected in accordance
with Section 602.4.1.2."
(9) In IBC, Section 602, a new section is added as follows: "602.4.1.4 Roofs. The
interior surfaces of roof assemblies shall be protected in accordance with Section 602.4.1.2.
Roof coverings in accordance with Chapter 15 shall be permitted on the outside surface of the
roof assembly."
(10) In IBC, Section 602, a new section is added as follows: "602.4.1.5 Concealed
spaces. Concealed spaces shall not contain combustibles other than electrical, mechanical, fire
protection, or plumbing materials and equipment permitted in plenums in accordance with
Section 602 of the IMC, and shall comply with all applicable provisions of Section 718.
Combustible construction forming concealed spaces shall be protected in accordance with
Section 602.4.1.2."
(11) In IBC, Section 602, a new section is added as follows: "602.4.1.6 Shafts. Shafts
shall be permitted in accordance with Sections 713 and 718. Both the shaft side and room side
of mass timber elements shall be protected in accordance with Section 602.4.1.2."
(12) In IBC, Section 602.4.2 is deleted and replaced with the following: "602.4.2 Type
IV-B. Building elements in Type IV-B construction shall be protected in accordance with
Sections 602.4.2.1 through 602.4.2.6. The required fire resistance rating of non-combustible
elements or mass timber elements shall be determined in accordance with Section 703.2 or
Section 703.3."
(13) In IBC, Section 602, a new section is added as follows: "602.4.2.1 Exterior
protection. The outside face of exterior walls of mass timber construction shall be protected
with non-combustible protection with a minimum assigned time of 40 minutes as determined
in Section 722.7.1. All components of the exterior wall covering shall be of non-combustible
material except water resistive barriers having a peak heat release rate of less than 150 kW/m
,
a total heat release of less than 20 MJ/m
 and an effective heat of combustion of less than
18MJ/kg as determined in accordance with ASTM E1354, and having a flame spread index of
or less and a smoke-developed index of 450 or less as determined in accordance with
ASTM E84 or UL 723. The ASTM E1354 test shall be conducted on specimens at the
thickness intended for use, in the horizontal orientation and at an incident radiant heat flux of
kW/m
."
(14) In IBC, Section 602, a new section is added as follows: "602.4.2.2 Interior
protection. Interior faces of all mass timber elements, including the inside face of exterior mass
timber walls and mass timber roofs, shall be protected, as required by this section, with
materials complying with Section 703.5."
(15) In IBC, Section 602, a new section is added as follows: "602.4.2.2.1 Protection
time. Non-combustible protection shall contribute a time equal to or greater than times
assigned in Table 722.7.1(1), but not less than 80 minutes. The use of materials and their
respective protection contributions listed in Table 722.7.1(2) shall be permitted to be used for
compliance with Section 722.7.1."
(16) In IBC, Section 602, a new section is added as follows: "602.4.2.2.2 Protected
area. All interior faces of all mass timber elements shall be protected in accordance with
Section 602.4.2.2.1, including the inside face of exterior mass timber walls and mass timber
roofs.
Exceptions: Unprotected portions of mass timber ceilings and walls complying with
Section 602.4.2.2.4 and the following:
1. Unprotected portions of mass timber:
(a) ceilings, including attached beams, shall be permitted and shall be limited to an
area equal to 20% of the floor area in any dwelling unit or fire area;
(b) walls, including attached columns, shall be permitted and shall be limited to an area
equal to 40% of the floor area in any dwelling unit or fire area; or
(c) walls and ceilings, including attached columns and beams, in any dwelling unit or
fire area shall be permitted in accordance with Section 602.4.2.2.3.
2. Mass timber columns and beams which are not an integral portion of walls or
ceilings, respectively, shall be permitted to be unprotected without restriction of either
aggregate area or separation from one another."
(17) In IBC, Section 602, a new section is added as follows: "602.4.2.2.3 Mixed
unprotected areas. In each dwelling unit or fire area, where both portions of ceilings and
portions of walls are unprotected, the total allowable unprotected area shall be determined in
accordance with Equation 6-1.
(Utc/Ua c) + (Utw/Ua w) 1 (Equation 6-1) where:
Utc = Total unprotected mass timber ceiling areas
Ua c = Allowable unprotected mass timber ceiling area conforming to Section 
 602.4.2.2.2, Exception 1
Utw = Total unprotected mass timber wall areas
Ua w = Allowable unprotected mass timber wall area conforming to Section 
 602.4.2.2.2, Exception 2."
(18) In IBC, Section 602, a new section is added as follows: "602.4.2.2.4 Separation
distance between unprotected mass timber elements. In each dwelling unit or fire area,
unprotected portions of mass timber walls and ceilings shall be not less than 15 feet from
unprotected portions of other walls and ceilings, measured horizontally along the ceiling and
from other unprotected portions of walls measured horizontally along the floor."
(19) In IBC, Section 602, a new section is added as follows: "602.4.2.3 Floors. The
floor assembly shall contain a non-combustible material not less than one inch in thickness
above the mass timber. Floor finishes in accordance with Section 804 shall be permitted on top
of the non-combustible material. The underside of floor assemblies shall be protected in
accordance with Section 602.4.1.2."
(20) In IBC, Section 602, a new section is added as follows: "602.4.2.4 Roofs. The
interior surfaces of roof assemblies shall be protected in accordance with Section 602.4.2.2
except, in non-occupiable spaces, they shall be treated as a concealed space with no portion left
unprotected. Roof coverings in accordance with Chapter 15 shall be permitted on the outside
surface of the roof assembly."
(21) In IBC, Section 602, a new section is added as follows: "602.4.2.5 Concealed
spaces. Concealed spaces shall not contain combustibles other than electrical, mechanical, fire
protection, or plumbing materials and equipment permitted in plenums in accordance with
Section 602 of the IMC, and shall comply with all applicable provisions of Section 718.
Combustible construction forming concealed spaces shall be protected in accordance with
Section 602.4.1.2."
(22) In IBC, Section 602, a new section is added as follows: "602.4.2.6 Shafts. Shafts
shall be permitted in accordance with Section 713 and Section 718. Both the shaft side and
room side of mass timber elements shall be protected in accordance with Section 602.4.1.2."
(23) In IBC, Section 602.4.3 is deleted and replaced with the following: "602.4.3 Type
IV-C. Building elements in Type IV-C construction shall be protected in accordance with
Sections 602.4.3.1 through 602.4.3.6. The required fire-resistance rating of building elements
shall be determined in accordance with Section 703.2 or Section 703.3."
(24) In IBC, Section 602, a new section is added as follows: "602.4.3.1 Exterior
Protection. The exterior side of walls of combustible construction shall be protected with
non-combustible protection with a minimum assigned time of 40 minutes as determined in
Section 722.7.1. All components of the exterior wall covering shall be of non-combustible
material except water resistive barriers having a peak heat release rate of less than 150 kW/m
,
a total heat release of less than 20 MJ/m
 and an effective heat of combustion of less than
18MJ/kg as determined in accordance with ASTM E1354 and having a flame spread index of
or less and a smoke-developed index of 450 or less as determined in accordance with
ASTM E84 or UL723. The ASTM E1354 test shall be conducted on specimens at the thickness
intended for use, in the horizontal orientation and at an incident radiant heat flux of 50
kW/m
."
(25) In IBC, Section 602, a new section is added as follows: "602.4.3.2 Interior
protection. Mass timber elements are permitted to be unprotected."
(26) In IBC, Section 602, a new section is added as follows: "602.4.3.3 Floors. Floor
finishes in accordance with Section 804 shall be permitted on top of the floor construction."
(27) In IBC, Section 602, a new section is added as follows: "602.4.3.4 Roofs. Roof
coverings in accordance with Chapter 15 shall be permitted on the outside surface of the roof
assembly."
(28) In IBC, Section 602, a new section is added as follows: "602.4.3.5 Concealed
spaces. Concealed spaces shall not contain combustibles other than electrical, mechanical, fire
protection, or plumbing materials and equipment permitted in plenums in accordance with
Section 602 of the IMC, and shall comply with all applicable provisions of Section 718.
Combustible construction forming concealed spaces shall be protected with non-combustible
protection with a minimum assigned time of 40 minutes as determined in Section 722.7.1."
(29) In IBC, Section 602, a new section is added as follows: "602.4.3.6 Shafts. Shafts
shall be permitted in accordance with Section 713 and Section 718. Shafts and elevator
hoistway and interior exit stairway enclosures shall be protected with non-combustible
protection with a minimum assigned time of 40 minutes as determined in Section 722.7.1, on
both the inside of the shaft and the outside of the shaft."
(30) In IBC, Section 602, a new section is added as follows: "602.4.4 Type IV-HT.
Type IV construction (Heavy Timber, HT) is that type of construction in which the exterior
walls are of non-combustible materials and the interior building elements are of solid wood,
laminated heavy timber or structural composite lumber (SCL), without concealed spaces. The
minimum dimensions for permitted materials including solid timber, glued-laminated timber,
structural composite lumber (SCL) and cross laminated timber (CLT) and details of Type IV
construction shall comply with the provisions of this section and Section 2304.11. Exterior
walls complying with Section 602.4.4.1 or 602.4.4.2 shall be permitted. Interior walls and
partitions not less than one-hour fire-resistance rating or heavy timber conforming with Section
2304.11.2.2 shall be permitted."
(31) In IBC, Section 602, a new section is added as follows: "602.4.4.1
Fire-retardant-treated wood in exterior walls. Fire-retardant-treated wood framing and
sheathing complying with Section 2303.2 shall be permitted within exterior wall assemblies
not less than 6 inches (152 mm) in thickness with a two-hour rating or less."
(32) In IBC, Section 602, a new section is added as follows: "602.4.4.2
Cross-laminated timber in exterior walls. Cross-laminated timber complying with Section
2303.1.4 shall be permitted within exterior wall assemblies not less than 6 inches (152 mm) in
thickness with a two-hour rating or less, provided the exterior surface of the cross-laminated
timber is protected by one the following:
1. fire-retardant-treated wood sheathing complying with Section 2303.2 and not less
than 15/32 inch (12 mm) thick;
2. gypsum board not less than 1/2 inch (12.7 mm) thick; or
3. a non-combustible material."
(33) In IBC, Section 602, a new section is added as follows: "602.4.4.3 Exterior
structural members. Where a horizontal separation of 20 feet (6096 mm) or more is provided,
wood columns and arches conforming to heavy timber sizes complying with Section 2304.11
shall be permitted to be used externally."
Section 9. Section 
15A-2a-204
 is enacted to read:
 15A-2a-204.
Amendments to Chapter 7 of IBC.
(1) In IBC, Section 703, a new section is added as follows: "703.8 Determination of
non-combustible protection time contribution. The time, in minutes, contributed to the
fire-resistance rating by the non-combustible protection of mass timber building elements,
components, or assemblies, shall be established through a comparison of assemblies tested
using procedures set forth in ASTM E119 or UL263. The test assemblies shall be identical in
construction, loading, and materials, other than the non-combustible protection. The two test
assemblies shall be tested to the same criteria of structural failure.
(a) Test Assembly 1 shall be without protection.
(b) Test Assembly 2 shall include the representative non-combustible protection. The
protection shall be fully defined in terms of configuration details, attachment details, joint
sealing details, accessories and all other relevant details.
The non-combustible protection time contribution shall be determined by subtracting
the fire-resistance time, in minutes, of Test Assembly 1 from the fire-resistance time, in
minutes, of Test Assembly 2."
(2) In IBC, Section 703, a new section is added as follows: "703.9 Sealing of adjacent
mass timber elements. In buildings of Type IV-A, IV-B, and IV-C construction, sealant or
adhesive shall be provided to resist the passage of air in the following locations:
1. At abutting edges and intersections of mass timber building elements required to be
fire-resistance-rated.
2. At abutting intersections of mass timber building elements and building elements of
other materials where both are required to be fire-resistance-rated.
Sealants shall meet the requirements of ASTM C920. Adhesives shall meet the
requirements of ASTM D3498.
Exception: Sealants or adhesives need not be provided where they are not a required
component of a tested fire-resistance-rated assembly."
(3) In IBC, Section 718.2.1 is deleted and replaced with the following: "718.2.1
Fireblocking materials. Fireblocking shall consist of the following materials:
1. Two-inch (51 mm) nominal lumber.
2. Two thicknesses of 1-inch (25 mm) nominal lumber with broken lap joints.
3. One thickness of 0.719-inch (18.3 mm) wood structural panels with joints backed by
0.719-inch (18.3 mm) wood structural panels.
4. One thickness of 0.75-inch (19.1 mm) particleboard with joints backed by 0.75-inch
(19 mm) particleboard.
5. 1/2 inch (12.7 mm) gypsum board.
6. 1/4 inch (6.4 mm) cement-based millboard.
7. Batts or blankets of mineral wool, mineral fiber or other approved materials installed
in such a manner as to be securely retained in place.
8. Cellulose insulation installed as tested for the specific application.
9. Mass timber complying with Section 2304.11."
(4) In IBC, Section 722, a new section is added as follows: "722.7 Fire-Resistance
rating of mass timber. The required fire resistance of mass timber elements in Section 602.4
shall be determined in accordance with Section 703.2 or Section 703.3. The fire-resistance
rating of building elements shall be as required in Tables 601 and 602 and as specified
elsewhere in this code. The fire-resistance rating of the mass timber elements shall consist of
the fire-resistance of the unprotected element added to the protection time of the
non-combustible protection."
(5) In IBC, Section 722, a new section is added as follows: "722.7.1 Minimum required
protection. Where required by Sections 602.4.1 through 602.4.3, non-combustible protection
shall be provided for mass timber building elements in accordance with Table 722.7.1(1). The
rating, in minutes, contributed by the non-combustible protection of mass timber building
elements, components, or assemblies, shall be established in accordance with Section 703.8.
The protection contributions indicated in Table 722.7.1(2) and Section 722.7.2 shall be deemed
to comply with this requirement when installed and fastened in accordance with Section
722.7.2."
(6) In IBC, Section 722, a new table is added as follows: "TABLE 722.7.1(1)
PROTECTION REQUIRED FROM NON-COMBUSTIBLE COVERING MATERIAL
Required Fire Resistance Rating of
Building Element per Tables 601 and 602
(hours)
Minimum Protection Required from
Non-combustible
or more
120"
(7) In IBC, Section 722, a new table is added as follows: "TABLE 722.7.1(2)
PROTECTION PROVIDED BY NON-COMBUSTIBLE COVERING MATERIAL
Non-combustible Protection
Protection
(minutes)
1/2 inch Type X Gypsum
/8 inch Type X Gypsum
Board
40"
(8) In IBC, Section 722, a new section is added as follows: "722.7.2 Installation of
gypsum board non-combustible protection. Gypsum board complying with Table 722.7.1(2)
shall be installed in accordance with this section."
(9) In IBC, Section 722, a new section is added as follows: "722.7.2.1 Interior surfaces.
Layers of Type X gypsum board serving as non-combustible protection for interior surfaces of
wall and ceiling assemblies determined in accordance with Table 722.7.1(1) shall be installed
in accordance with the following:
1. Each layer shall be attached with Type S drywall screws of sufficient length to
penetrate the mass timber at least 1 inch when driven flush with the paper surface of the
gypsum board.
Exception: The third layer, where determined necessary by Section 722.7, shall be
permitted to be attached with 1 inch #6 Type S drywall screws to furring channels in
accordance with ASTM C645.
2. Screws for attaching the base layer shall be 12 inches on center in both directions.
3. Screws for each layer after the base layer shall be 12 inches on center in both
directions and offset from the screws of the previous layers by 4 inches in both directions.
4. All panel edges of any layer shall be offset 18 inches from those of the previous
layer.
5. All panel edges shall be attached with screws sized and offset as in items 1 through
above and placed at least 1 inch but not more than 2 inches from the panel edge.
6. All panels installed at wall-to-ceiling intersections shall be installed such that ceiling
panels are installed first and the wall panels are installed after the ceiling panel has been
installed and is fitted tight to the ceiling panel. Where multiple layers are required, each layer
shall repeat this process.
7. All panels installed at a wall-to-wall intersection shall be installed such that the
panels covering an exterior wall or a wall with a greater fire resistance rating shall be installed
first and the panels covering the other wall shall be fitted tight to the panel covering the first
wall. Where multiple layers are required, each layer shall repeat this process.
8. Panel edges of the face layer shall be taped and finished with joint compound.
Fastener heads shall be covered with joint compound.
9. Panel edges protecting mass timber elements adjacent to unprotected mass timber
elements in accordance with Section 602.4.2.2 shall be covered with 1-1/4 inch metal corner
bead and finished with joint compound."
(10) In IBC, Section 722, a new section is added as follows: "722.7.2.2 Exterior
surfaces. Layers of Type X gypsum board serving as non-combustible protection for the outside
of the exterior heavy timber walls determined in accordance with Table 722.7.1(1) shall be
fastened 12 inches on center each way and 6 inches on center at all joints or ends. All panel
edges shall be attached with fasteners located at least 1 inch but not more than 2 inches from
the panel edge. Fasteners shall comply with one of the following:
1. Galvanized nails of minimum 12 guage with a 7/16 inch head of sufficient length to
penetrate the mass timber a minimum of 1 inch.
2. Screws which comply with ASTM C1002 (Type S, Type W, or Type G) of sufficient
length to penetrate the mass timber a minimum of 1 inch."
(11) In IBC, Section 1705, a new section is added as follows: "1705.19 Sealing of mass
timber. Periodic special inspections of sealants or adhesives shall be conducted where sealant
or adhesive required by Section 703.9 is applied to mass timber building elements as
designated in the approved construction documents."
(12) In IBC, Section 3102.3 is deleted and replaced with the following: "3102.3 Type
of construction. Non-combustible membrane structures shall be classified as Type IIB
construction. Non-combustible frame or cable-supported structures covered by an approved
membrane in accordance with Section 3102.3.1 shall be classified as Type IIB construction.
Heavy timber frame-supported structures covered by an approved membrane in accordance
with Section 3102.3.1 shall be classified as Type IV-HT construction. Other membrane
structures shall be classified as Type V construction.
Exception: Plastic less than 30 feet (9144 mm) above any floor used in greenhouses,
where occupancy by the general public is not authorized, and for aquaculture pond covers is
not required to meet the fire propagation performance criteria of Test Method 1 or Test Method
2, as appropriate, of NFPA 701."
(13) In IBC, Section 3102.6.1.1 is deleted and replaced with the following: "3102.6.1.1
Membrane. A membrane meeting the fire propagation performance criteria of Test Method 1 or
Test Method 2, as appropriate, of NFPA 701 shall be permitted to be used as the roof or as a
skylight on buildings of Type IIB, III, IV-HT and V construction, provided that the membrane
is not less than 20 feet (6096 mm) above any floor, balcony or gallery."
Section 10. Section 
15A-2a-301
 is enacted to read:
Part 3. Statewide Amendments to International Fire Code
 15A-2a-301.
Amendments to Chapter 7 of IFC.
In IFC, Section 701.6 is deleted and replaced with the following: "701.6 Owner's
responsibility. The owner shall maintain an inventory of all required fire-resistance-rated
construction, construction installed to resist the passage of smoke and the construction included
in Sections 703 through 707 and Sections 602.4.1 and 602.4.2 of the International Building
Code. Such construction shall be visually inspected by the owner annually and properly
repaired, restored or replaced where damaged, altered, breached or penetrated. Records of
inspections and repairs shall be maintained. Where concealed, such elements shall not be
required to be visually inspected by the owner unless the concealed space is accessible by the
removal or movement of a panel, access door, ceiling tile or similar movable entry to the
space."
Section 11. Section 
15A-2a-302
 is enacted to read:
 15A-2a-302.
Amendments to Chapters 9 and 33 of IFC.
(1) In IFC, Section 914.3.1.2 is deleted and replaced with the following: "914.3.1.2
Water supply to required fire pumps. In all buildings that are more than 420 feet (128m) in
building height, and buildings of Type IV-A and IV-B construction that are more than 120 feet
in building height, required fire pumps shall be supplied by connections to not fewer than two
water mains located in different streets. Separate supply piping shall be provided between the
connection and the pumps shall be sized to supply the flow and pressure required for the pumps
to operate.
Exception: Two connections to the same main shall be permitted provided that the main
is valved such that an interruption can be isolated so that the water supply will continue
without interruption through not fewer than one of the connections."
(2) In IFC, Section 3308, a new section is added as follows: "3308.9 Fire safety
requirements for buildings of Types IV-A, IV-B, and IV-C construction. Buildings of Types
IV-A, IV-B, and IV-C construction designed to be greater than six stories above grade plane
shall comply with the following requirements during construction unless otherwise approved
by the fire code official:
1. Standpipes shall be provided in accordance with Section 3313.
2. A water supply for fire department operations, as approved by the fire code official
and the fire chief.
3. Where building construction exceeds six stories above grade plane, at least one layer
of non-combustible protection where required by Section 602.4 of the International Building
Code shall be installed on all building elements more than 4 floor levels, including mezzanines,
below active mass timber construction before erecting additional floor levels.
Exception: Shafts and vertical exit enclosures shall not be considered a part of the
active mass timber construction.
4. Where building construction exceeds six stories above grade plane required exterior
wall coverings shall be installed on all floor levels more than 4 floor levels, including
mezzanines, below active mass timber construction before erecting additional floor level.
Exception: Shafts and vertical exit enclosures shall not be considered a part of the
active mass timber construction."
Section 12. Section 
15A-2a-401
 is enacted to read:
Part 4. Reference Standards
 15A-2a-401.
Reference Standards.
ASTM
D3498-03(2011): Standard Specification for Adhesives for Field-Gluing Plywood to
Lumber Framing for Floor Systems
ASTM International
Barr Harbor Drive,
P.O. Box C700
West Conshohocken, PA 19428-2959