14B-15-1504 Performance requirements.

The provisions of Section 1504 of IBC are adopted by reference with the following modifications:

1.   Revise Section 1504.1.1 to read:

"1504.1.1 Wind resistance of asphalt shingles.

Asphalt shingles shall be tested in accordance with ASTM D7158 and have a classification of D, G or H. Asphalt shingle packaging shall bear a label to indicate compliance with ASTM D7158 and the required classification.

Exception: Asphalt shingles not included in the scope of ASTM D7158 shall be tested and labeled in accordance with ASTM D3161 and have a classification of A, D or F. Asphalt shingle packaging shall bear a label to indicate compliance with ASTM D3161 and the required classification."

1.1.   Delete Table 1504.1.1.

1.2.   Revise Section 1504.4 to read:

"1504.4 Ballasted low-sloped roof systems.

Ballasted low-sloped roof single-ply roof system coverings installed in accordance with Sections 1507.12 and 1507.13 shall be designed in accordance with Section 1504.8 and ANSI/SPRI RP-4."

2.   Revise Section 1504.5 to read:

"1504.5 Edge securement for low-sloped roofs.

Low-sloped roof built-up, modified bitumen and single-ply roof system metal edge securement, except gutters, shall be designed and installed for wind loads in accordance with Chapter 16 and tested for resistance in accordance with Test Methods RE-1, RE-2 and RE-3 of ANSI/SPRI ES-1, except basic design wind speed, V, shall be determined from Section 1609.3."

3.   Revise Section 1504.6 to read:

"1504.6 Physical properties.

Roof coverings installed on low-sloped roofs in accordance with Section 1507 shall demonstrate physical integrity over the working life of the roof based on 2,000 hours of exposure to accelerated weathering tests conducted in accordance with ASTM G152, ASTM G154 or ASTM G155. Those roof coverings that are subject to cyclical flexural response due to wind loads shall not demonstrate any significant loss of tensile strength for unreinforced membranes or breaking strength for reinforced membranes when tested as herein required."

4.   Revise Section 1504.7 to read:

"1504.7 Impact resistance.

Roof coverings installed on low-sloped roofs in accordance with Section 1507 shall resist impact damage based on the results of tests conducted in accordance with ASTM D3746, ASTM D4272 or the "Resistance to Foot Traffic Test" in Section 5.5 of FM 4470."

5.   Revise Section 1504.8 to read:

"1504.8 Surfacing and ballast materials.

For a building with a mean roof height exceeding that permitted by Table 1504.8 based on the exposure category, the following materials shall not be used on the roof:

1.   Aggregate used as surfacing for roof coverings.

2.   Aggregate, gravel or stone used as ballast."

6.   Replace Table 1504.8 as shown:

TABLE 1504.8
MAXIMUM ALLOWABLE MEAN ROOF HEIGHT PERMITTED FOR BUILDINGS WITH AGGREGATE ON THE ROOF

 

RISK CATEGORY b	MEAN ROOF HEIGHT (ft) a
	Exposure category c
	B	C	D
I or II	55	55	30
III	55	40	20
IV	55	25	NP

 

For SI: 1 foot = 304.8 mm

NP = gravel and stone not permitted for any roof height.

a.   Mean roof height as defined in ASCE 7.

b.   Risk category shall be determined in accordance with Section 1604.5.

c.   Exposure category shall be determined in accordance with Section 1609.4.3.

(Amend Coun. J. 2-19-20, p. 14473, Art. II, § 66)

14B-15-1505 Fire classification.

The provisions of Section 1505 of IBC are adopted by reference with the following modifications:

1.   Revise Section 1505.2 by replacing "approved testing agency" with "approved agency."

2.   Revise the exceptions to 1505.2 by replacing "decks" with "roof decks."

3.   Revise Table 1505.1 by changing the value for IIB from "C c" to "B."

4.   Revise the notes to Table 1505.1 to read:

"a.   Unless otherwise required due to the location of the building within a fire district in accordance with Appendix D.

b.   Class C roof coverings shall be allowed on buildings of Group R-3, R-4, R-5 and Group U occupancies, where there is a minimum fire-separation distance of 6 feet measured from the leading edge of the roof.

c.   Buildings that are not more than two stories above grade plane and having not more than 6,000 square feet of projected roof area and where there is a minimum 10-foot fire separation distance from the leading edge of the roof to an abutting property line on all sides of the building, shall be allowed to have roofs of fire- retardant-treated wood shingles and shakes constructed in accordance with Section 1505.6 or No. 1 cedar or redwood shakes and No. 1 shingles constructed in accordance with Section 1505.7."

5.   Revise Section 1505.3 by replacing "approved testing agency" with "approved agency."

6.   Revise Section 1505.4 by replacing "approved testing agency" with "approved agency."

7.   Delete Section 1505.5.

8.   Revise Section 1505.10 to read:

"1505.10 Vegetative roofs, roof gardens and landscaped roofs.

Vegetative roofs, roof gardens and landscaped roofs shall comply with Sections 1507.16 and 1514."

(Amend Coun. J. 2-19-20, p. 14473, Art. II, § 67)

14B-15-1506 Materials.

The provisions of Section 1506 of IBC are adopted by reference with the following modification:

1.   Revise Section 1506.3 by replacing "approved testing agency" with "approved agency."

(Amend Coun. J. 2-19-20, p. 14473, Art. II, § 68)

14B-15-1507 Requirements for roof coverings.

The provisions of Section 1507 of IBC are adopted by reference with the following modifications:

1.   Revise Tables 1507.1.1(1), 1507.1.1(2) and 1507.1.1(3) by changing the title of the third column to "INSTALLATION STANDARD" and deleting the fourth column.

2.   Revise the first sentence of Section 1507.1.2 to read:

"At eaves, an ice barrier shall be installed for asphalt shingles, metal roof shingles, mineral-surfaced roll roofing, slate and slate-type shingles, wood shingles and wood shakes."

3.   Revise Table 1507.2.8.2 to delete the rows for lead, lead-coated copper, lead-coated high-yield copper, and painted terne.

4.   Revise Section 1507.4.2 by deleting "approved."

5.   Revise Table 1507.4.3(1) to delete the rows for hard lead, lead-coated copper, soft lead, and terne and terne coated stainless.

6.   Revise Section 1507.4.4 to replace "approved manufacturer’s" with "manufacturer’s recommended."

7.   Revise the title of Section 1507.4.5 to "Underlayment."

8.   Revise Section 1507.5.6 by deleting "approved."

9.   Revise Table 1507.8 by deleting "(Type 316 for coastal areas)."

10.   Revise Section 1507.8.9 by replacing "approved grading or inspection bureau or agency" with "approved agency."

11.   Revise Section 1507.9.10 by replacing "approved grading or inspection bureau or agency" with "approved agency."

12.   Revise Section 1507.11 and its subsections by replacing each instance of "modified bitumen roofing" with "modified bitumen roof covering."

13.   Revise Section 1507.12.2 by deleting "ASTM D5019."

14.   Revise Section 1507.12.3 to read:

"1507.12.3 Ballasted thermoset low-sloped roofs.

Ballasted thermoset low-sloped roofs shall be installed in accordance with this section and Section 1504.4. Stone used as ballast shall comply with ASTM D448 or ASTM D7655."

15.   Revise Section 1507.13.3 to read:

"1507.13.3 Ballasted thermoplastic low-sloped roofs.

Ballasted thermoplastic low-sloped roofs shall be installed in accordance with this section and Section 1504.4. Stone used as ballast shall comply with ASTM D448 or ASTM D7655."

16.   Revise Section 1507.15 to read:

"1507.15 Liquid-applied roofing.

The installation of cold and hot applied liquid-applied roofing shall comply with the provisions of this section."

17.   Revise Section 1507.15.2 to read:

"1507.15.2 Material standards.

Liquid-applied roofing shall comply with ASTM C836, ASTM C957, ASTM D1227 or ASTM D3468, ASTM D6083, ASTM D6694, ASTM D6947 or other approved material standard."

18.   Revise Section 1507.16 to read:

"1507.16 Vegetative roofs, roof gardens and landscaped roofs.

Vegetative roofs, roof gardens and landscaped roofs shall comply with the requirements of this chapter and Section 1607.13.3."

19.   Revise Section 1507.17.2 to read:

"1507.17.2 Deck slope.

Photovoltaic shingles shall not be installed on low-sloped roofs."

20.   Revise Section 1507.18.2 to read:

"1507.18.2 Deck slope.

BIPV roof panels shall not be used on low-sloped roofs."

21.   Revise Section 1507.18.4.2, excluding the exception, to read:

"1507.18.4.2 Ice barrier.

An ice barrier consisting of not fewer than two layers of underlayment cemented together or of a self-adhering polymer/modified bitumen sheet shall be used instead of normal underlayment and extend from the lowest edges of all roof surfaces to a point not less than 24 inches (610 mm) inside the exterior wall line of the building."

(Amend Coun. J. 2-19-20, p. 14473, Art. II, § 69)

14B-15-1508 Roof insulation.

The provisions of Section 1508 of IBC are adopted by reference with the following modification:

1.   Revise Section 1508.1 to read:

"1508.1 General.

The use of above-deck thermal insulation shall be permitted provided that such insulation is covered with a roof covering and passes the tests of NFPA 276 or UL 1256 when tested as an assembly.

Exceptions:

1.   Foam plastic insulation shall conform to the material and installation requirements of Chapter 26.

2.   Where a concrete roof deck is used and the above-deck thermal insulation is covered with a roof covering."

14B-15-1509 Radiant barriers installed above deck.

The provisions of Section 1509 of IBC are adopted by reference with the following modifications:

1.   Revise Section 1509.1 to replace "deck" with "roof deck."

2.   Revise Section 1509.2 to replace "decks" with "roof decks" and "an approved" with "a."

3.   Revise Section 1509.4 to replace ""deck" with "roof deck."