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SEC. 91.1507.  REQUIREMENTS FOR ROOF COVERINGS.
   (Amended by Ord. No. 182,850, Eff. 1/3/14.)
 
      Section 1507 of the CBC is adopted by reference, except Sections 1507.3.1 and Table 1507.3.7 of the CBC are not adopted and, in lieu, LAMC Subdivision 91.1507.3.1 and Table 1507.3.7 are added.  (Amended by Ord. No. 185,587, Eff. 7/16/18.)
 
91.1507.3.1.  Deck Requirements.  Concrete and clay tile shall be installed only over solid sheathing.  (Amended by Ord. No. 180.,619, Eff. 5/12/09.)
 
TABLE 1507.3.7
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.