§ 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" destination-id="JD_Table13-60-100">13-60-100 as set out following this section and Section 13-60-110" destination-id="JD_13-60-110">13-60-110.

(Prior code § 49-8; Amend Coun. J. 12-7-84, p. 11597)

13-60-100" name="Table 13-60-100"/>Table 13-60-100REQUIRED HOURS OF FIRE RESISTANCE FOR TYPES OF CONSTRUCTION

Type I Fire-Resistive Type II Noncom- bustible Type III Exterior Protected Type IV Combustible Frame
Heavy Timber Ordinary
Description 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" destination-id="JD_13-84-130">13-84-130.
(g) See Sections 15-8-120" destination-id="JD_15-8-120">15-8-120 to 15-8-250" destination-id="JD_15-8-250">15-8-250, inclusive.
(h) See Section 13-60-050" destination-id="JD_13-60-050">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
(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) In I-A construction fire-resistance of floor construction may be reduced from three hours to two hours when the building is equipped throughout with an approved automatic sprinkler system which is supervised and provided with a two- source water supply, one of which shall be provided with an emergency power supply as defined in Section 15-16-180" destination-id="JD_15-16-180">15-16-180.
(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.

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