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(Amended by Ord. No. 187,719, Eff. 1/23/23.)
Section 1507 of the CBC is adopted by reference, except Table 1507.3.7 of the CBC is not adopted and, in lieu, Los Angeles Municipal Code Table 1507.3.7 is added.
CLAY AND CONCRETE TILE ATTACHMENT a, b, c
(Amended by Ord. No. 181,758, Eff. 8/8/11.)
GENERAL – CLAY OR CONCRETE ROOF TILE | |||
Maximum basic wind speed (mph) | Mean roof height (feet) | Roof slope up to <3:12 | Roof slope 3:12 and over |
85 | 0-60 | Two fasteners per tile. | Two fasteners per tile. |
100 | 0-40 | ||
100 | >40-60 | The head of all tiles shall be nailed. The nose of all eave tiles shall be fastened with approved clips. All rake tiles shall be nailed with two nails. The nose of all ridge, hip and rake tiles shall be set in a bead of roofer’s mastic. | |
110 | 0-60 | The fastening system shall resist the wind forces in CBC Section 1609.5.3. | |
120 | 0-60 | The fastening system shall resist the wind forces in CBC Section 1609.5.3. | |
130 | 0-60 | The fastening system shall resist the wind forces in CBC Section 1609.5.3. | |
All
| >60 | The fastening system shall resist the wind forces in CBC Section 1609.5.3. | |
INTERLOCKING CLAY OR CONCRETE ROOF TILE WITH PROJECTING ANCHOR LUGS d, e (Installations on solid sheathing with battens) | ||||
Maximum basic wind speed (mph) | Mean roof height (feet) | Roof slope up to < 5:12 | Roof slope 5:12 < 12:12 | Roof slope 12:12 and over |
85 | 0-60 | Minimum slope is 4:12. One fastener per tile. | One fastener per tile. Tiles with installed weight less than 9 lbs./sq. ft. require a minimum of one fastener per tile. | One fastener required for every tile. Tiles with installed weight less than 9 lbs./sq. ft. require a minimum of one fastener per tile. |
100 | 0 - 40 | |||
100 | >40-60 | The head of all tiles shall be nailed. The nose of all eave tiles shall be fastened with approved clips. All rake tiles shall be nailed with two nails. The nose of all ridge, hip and rake tiles shall be set in a bead of roofer’s mastic. | ||
110 | 0-60 | The fastening system shall resist the wind forces in CBC Section 1609.5.3. | ||
120 | 0-60 | The fastening system shall resist the wind forces in CBC Section 1609.5.3. | ||
130 | 0-60 | The fastening system shall resist the wind forces in CBC Section 1609.5.3. | ||
All | >60 | The fastening system shall resist the wind forces in CBC Section 1609.5.3. | ||
INTERLOCKING CLAY OR CONCRETE ROOF TILE WITH PROJECTING ANCHOR LUGS (Installations on solid sheathing without battens) | ||||
Maximum basic wind speed (mph) | Mean roof height (feet) | Minimum roof slopes 4 units vertical in 12 units horizontal Maximum slope 7 units vertical in 12 units horizontal | ||
85 | 0-60 | One fastener per tile. | ||
100 | 0-40 | One fastener per tile. | ||
100 | >40-60 | The head of all tiles shall be nailed. The nose of all eave tiles shall be fastened with approved clips. All rake tiles shall be nailed with two nails The nose of all ridge, hip and rake tiles shall be set in a bead of roofer’s mastic. | ||
110 | 0-60 | The fastening system shall resist the wind forces in CBC Section 1609.5.3. | ||
120 | 0-60 | The fastening system shall resist the wind forces in CBC Section 1609.5.3. | ||
130 | 0-60 | The fastening system shall resist the wind forces in CBC Section 1609.5.3. | ||
All | >60 | The fastening system shall resist the wind forces in CBC Section 1609.5.3. | ||
For SI: one inch = 25.4 mm, one foot = 304.8 mm, one mile per hour = 0.447 m/s, one pound per square foot= 4.882 kg/m2.
a Minimum fastener size. Hot dipped galvanized ring shank or other corrosion-resistant nails not less than No. 11 gage with 5/16-inch head. Fasteners shall be long enough to penetrate into the sheathing 0.75 inch or through the thickness of the sheathing, whichever is less. Attaching wire for clay and concrete tile shall not be smaller than 0.083 inch and shall be copper, brass or stainless steel.
b Snow areas. A minimum of two fasteners per tile are required or battens and one fastener.
c Roof slopes greater than 24:12. The nose of all tiles shall be securely fastened.
d Horizontal battens. Battens shall be not less than one-inch by two-inch nominal. Provisions shall be made for drainage by a minimum of 1/8-inch riser at each nail or by four-foot-long battens with at least a 0.5-inch separation between battens. Horizontal battens are required for slopes over 7:12.
e Perimeter fastening areas include three tile courses but not less than 36 inches from either side of hips or ridges and edges of eaves and gable rakes.
(Amended by Ord. No. 187,719, Eff. 1/23/23.)
Section 1511 of the CBC is adopted by reference, except CBC Sections 1512.2.1 and 1512.3 are not adopted and, in lieu, Los Angeles Municipal Code Subsections 91.1512.2.1 and 91.1512.3 are added.
1. Where the new roof covering is installed in accordance with the roof covering manufacturer’s approved instructions.
2. Complete and separate roofing systems, such as standing-seam metal roof panel systems, that are designed to transmit the roof loads directly to the building’s structural system and that do not rely on existing roofs and roof coverings for support, shall not require the removal of existing roof coverings.
3. The application of a new protective coating over an existing spray polyurethane foam roofing system shall be permitted without tear off of existing roof coverings.
91.1512.3. Roof Recovering. Roof covering may be applied over existing roofing in accordance to Los Angeles Municipal Code Table 1512.1.
EXISTING ROOFING | NEW OVERLAY ROOFING | |||||
BUILT UP | ASPHALT SHINGLE | TILE ROOF | METAL ROOF | MODIFIED BITUMEN | SPRAY POLY- URETHANE FORM | |
EXISTING ROOFING | NEW OVERLAY ROOFING | |||||
BUILT UP | ASPHALT SHINGLE | TILE ROOF | METAL ROOF | MODIFIED BITUMEN | SPRAY POLY- URETHANE FORM | |
Built Up | Yes | Yes (2:12) | Yes (2.5:12) | Yes | Yes | Yes |
Asphalt Shingle | NP | Yes | Yes (2.5:12) | Yes | Yes | NP |
Asphalt over Asphalt | NP | Yes | Yes | Yes | Yes | NP |
Tile Roof | NP | NP | NP | NP | NP | NP |
Metal Roof | NP | NP | NP | Yes | NP | NP |
Modified Bitumen | Yes | Yes | Yes (2.5:12) | Yes | Yes | NP |
NP = Not Permitted.
Note: (Minimum Roof Slope)
(Amended by Ord. No. 187,719, Eff. 1/23/23.)
Section 1603 of the CBC is adopted by reference and Los Angeles Municipal Code Subsection 91.1603.1.10 is added.
91.1603.1.10. Systems and Components Requiring Special Inspections for Seismic Resistance. Construction documents or specifications shall be prepared for those systems and components requiring special inspection for seismic resistance as specified in CBC Section 1705.13 by the registered design professional responsible for their design and shall be submitted for approval in accordance with LAMC Subsection 91.106.3.3. Reference to seismic standards in lieu of detailed drawings is acceptable.
(Amended by Ord. No. 182,850, Eff. 1/3/14.)
Section 1609 of the CBC is adopted by reference, and LAMC Paragraph 91.1609.1.1.2 is added as follows: (Amended by Ord. No. 185,587, Eff. 7/16/18.)
91.1609.1.1.2. High Wind Velocity Areas. The Superintendent of Building may designate certain areas of the City as “high wind velocity areas” when evidence or studies indicate that the wind velocity results in damage to structures conforming to the minimum requirements of this Code. The Superintendent of Building may specify additional requirements over and above those required by this Code with respect to the following:
1. Glazing of openings in exterior walls;
2. Anchorage of post and beam construction;
3. Cantilever overhangs; and
4. Roofing and roof framing.
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