13-60-090 Fire-resistive values.

   The degree of fire resistance of materials, assemblies and construction shall be measured in terms of the number of hours of satisfactory performance as determined by the requirements of Sections 15-12-060 and 15-12-090.

(Prior code § 49-7; Amend Coun. J. 6-14-95, p. 2841)

13-60-100 Types of construction – Fire-resistive requirements.

   The fire-resistive values required for the various elements for each type of construction shall be as established in Table 13-60-100 as set out following this section and Section 13-60-110.

Table 13-60-100
Required Hours of Fire Resistance for Types of Construction

	Description	Type I Fire-Resistive			Type II Noncom- bustible	Type III Exterior Protected			Type IV Combustible Frame
						Heavy Timber	Ordinary
		Type I-A	Type I-B	Type I-C		Type III-A	Type III-B	Type III-C	Type IV-A	Type IV-B
1	Exterior Bearing Walls	4(d)	3(d)	2	N.C.	4(d)	3(d)	3(d)	1	1/2(e)
2	Exterior Nonbearing Wall
	Outside Exposure	2(d)	2(d)	2(d)	N.C.	2(d)	2(d)	2(d)	1
	Inside Exposure (a)	4	3	2	N.C.	2	2	2	1	1/2(e)
	Inside Exposure (b)	3	2	2	N.C.	2	2	2	1	1/2(e)
	Inside Exposure (c)	2	2	1	N.C.	1	1	1	1	1/2(e)
3	Interior Bearing Walls	4	3	2	N.C.	3	1(j)	1/2(e)	1	1/2(e)
4	Interior Nonbearing Walls & Partitions	(g)	(g)	(g)	(g)	(g)	1/2(e)	1/2(e)	(g)	1/2(e)(l)
5	Exterior Columns	4(p)(o)	3(p) (o)	2(p)(o)	N.C.	4	2	2	1	1/2(e)
6	Interior Columns
	Supporting Roofs Only	3(k)(p)	2(k)(p)	1(k)(p)	N.C.	(h)	1/2(f)	1/2(f)	1/2(f)	1/2(f)
	Other Columns	4	3	2	N.C.	(h)	1	1/2(e)	1	1/2(e)
7	Beams, Girders & Trusses
	Supporting Roofs Only	2(k)(o) (p)	2(k)(p)(o)	1(k)(o)(p)	N.C.	(h)	1	1/2(f)	1/2(f)	1/2(f)
	Other Beams, Girders & Trusses	3(o)	2(o)	1(o)	N.C.	(h)	1	1/2(e)	1	1/2(e)
8	Floor Construction	3(o)	2(o)	1(o)	N.C.	(h)	1	1/2(e)	1	1/2(e)
9	Roof Construction	2(k)(o) (p)	2(k)(p)(o)	1(k)(o)(p)	N.C.	(h)	1/2(f)	1/2(f)	1/2(f)	1/2(f)(l)
Notes Pertaining to Table 13-60-100
N.C. – Noncombustible.
(a)   Storage. industrial and hazardous occupancies.
(b)   Business and mercantile occupancies.
(c)   Residential, institutional and assembly occupancies.
(d)   When exterior walls face a street, public open space, yard or court not less than 30 feet in width, such walls may be of noncombustible materials providing fire-resistance from outside exposure as follows:
(1)   Exterior bearing walls of buildings of Types I-A and III-A construction – three hours.
(2)   Exterior bearing walls of buildings of Types I-B, III-B and III-C construction – two hours.
(3)   Exterior nonbearing walls of buildings of Types I-A, I-B, I-C, III-A, III-B and III-C construction – one hour.
(e)   Fire-resistive protection shall be required in all buildings except in one-story industrial and storage units, private garages and the various buildings and structures listed in Chapter 13-116. For single-family residential units, interior facings on wood framings of exterior walls, or ceilings under nonhabitable spaces, shall be of material providing not less than 15 minutes' protection.
(f)   Fire protection of roof construction and columns supporting such roof construction only shall not be required in one- story buildings of assembly, business, mercantile. industrial and storage occupancies except as provided in Section 13-84-130.
(g)   See Sections 15-8-120 to 15-8-250, inclusive.
(h)   See Section 13-60-050.
(j)    The use of combustible construction other than heavy timber construction for load-bearing walls or load- bearing partitions shall be limited to the support of not more than two floors and a roof unless the building is protected by an automatic sprinkler system in accordance with Chapter 15-16.
(k)   Fire protection shall not be required for construction located at a distance of 20 feet or more above any floor, mezzanine or balcony. One-hour construction only shall be required for construction located 14 feet or more above any floor, mezzanine or balcony.
(l)   In single family residential units not over one story high, having a floor area not exceeding 1,000 square feet. nonbearing partitions may be of such materials as will have a fire-resistance rating not less than a wood stud partition covered on both sides with one-half inch exterior grade plywood which will have a flame spread rating of not to exceed 30, and which will withstand an impact equivalent to 60 pounds at three and one-half feet. Ceiling material may be similar, with a fire-resistance rating equivalent to such covering on one side of said studs.
(m)   In open plan schools not exceeding three stories in height and equipped throughout with a standard sprinkler system as defined in Chapter 15-16 of this code, the required fire-resistance rating specified for various structural members under Types IA and I-B construction classes may each be decreased one hour below that required in the above table except that a minimum of one hour shall be required in each case.
(n)   [Reserved.]
(o)   Fire protection shall not be required for exterior structural members of business, residential and assembly (other than exhibition halls) occupancies when the building is equipped with a supervised standard automatic sprinkler system as defined in Chapter 15-16 of this code and does not exceed 55 feet in height. Fire protection shall not be required for exterior columns or portions of beams or girders which are outside of the building envelope, face a public way not less than 30 feet in width and do not support exterior floors or walkways intended for normal human occupancy.
(p)   Fire protection shall not be required for roof construction including columns. beams, girders, and trusses supporting the roof only of areas classified per Chapter 15-16 as “light hazard occupancy” in business, residential and assembly (other than exhibition halls) occupancies in buildings equipped with a supervised standard automatic sprinkler system as defined in Chapter 15-16 of this code.

 

(Prior code § 49-8; Amend Coun. J. 12-7-84, p. 11597; Amend Coun. J. 9-6-17, p. 55278, Art. VII, § 1; Amend Coun. J. 3-28-18, p. 74459, Art. V, § 8)

13-60-110 Exception to fire protection.

   Fire protection requirements as established in Section 13-60-100 shall be under the conditions provided in Sections 13-60-120 to 13-60-160, inclusive.

(Prior code § 49-9)

13-60-120 Supporting members – Fire-resistive value.

   The fire-resistive value of any structural member shall be not less than the required fire-resistive rating of construction supported by such member.

(Prior code § 49-9.1)

13-60-130 Elevator framing – Exception to fire protection.

   Structural members or frames for elevators, located wholly within elevator shaft enclosures or in penthouses, shall not be required to be fire protected.

(Prior code § 49-9.2)

13-60-140 Lintels – Exception to fire protection.

   Lintels over masonry wall openings not exceeding five feet in clear width shall not be required to be fire protected.

(Prior code § 49-9.3)

13-60-150 Supporting wall facing – Fire protection provisions.

   Members, supporting wall facing which is not more than four and one-half inches in thickness and securely anchored or bonded to backing, shall not be required to be fire protected, provided that such members are properly supported by spandrel beams or lintels which are fire protected as required in Section 13-60-100.

(Prior code § 49-9.4)