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ROOF COVERAGE AND EXPOSURE TABLES
TABLE 1 - Shingle Coverage
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LENGTH AND THICKNESS
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Approximate coverage, in square feet, of one square (four bundles) of shingles based on following weather exposures
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Exposure
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3 ½”
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4”
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4 ½”
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5”
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5 ½”
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6”
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6 ½”
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7”
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7 ½”
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16" X 5/2"
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70
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80
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90
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100*
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18" X 5/2.25"
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72 ½
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81 ½
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90 ½
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100*
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24" x 4/2"
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73 ½
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80
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86 ½
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93
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100*
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Note: *Maximum exposure recommended for roofs
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TABLE 2 - Shingle Exposure
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Maximum exposure recommended for roofs
LENGTH
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NUMBER ONE BLUE LABEL
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NUMBER TWO
RED LABEL
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NUMBER THREE
BLACK LABEL
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SLOPE
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16”
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18”
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24”
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16”
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18”
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24”
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16”
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18”
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24”
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3:12 to 4:12
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3 ¾”
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4 ¼”
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5 ¾”
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3 ½”
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4”
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5 ½”
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3”
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3 ½”
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5”
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4:12 and steeper
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5”
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5 ½”
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7 ½”
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4”
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4 ½”
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6 ½”
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3 ½”
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4”
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5 ½”
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TABLE 3 - Shake Coverage (f)
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SHAKE TYPE, LENGTH AND THICKNESS
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Approximate coverage (in sq. ft.) of one square, when shakes are applied with an average½" spacing, at the following weather exposures, in inches (d):
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5"
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5½"
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7½"
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8½"
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10"
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18" x½" Handsplit-and-Resawn Mediums (a)*
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-
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75(b)
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100(f,c)
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-
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-
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18" x 3/4" Handsplit-and-Resawn Heavies (a)*
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-
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55(b)
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75(f,c)
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-
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-
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18" x 5/8" Tapersawn*
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-
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Approx 75(b)
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100(f,c)
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-
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-
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24" x 3/8" Handsplit
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-
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-
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75(e)
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-
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-
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24" x½" Handsplit-and-Resawn Mediums
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-
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-
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75(b)
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85
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100(c)
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24" x 3/4" Handsplit-and-Resawn Heavies
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-
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-
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75(b)
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85
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100(c)
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24" x½" Tapersawn
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-
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-
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75(b)
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85
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100(c)
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24" x½" Tapersplit
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-
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-
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75(b)
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85
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100(c)
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18" x 3/8" Straight-Split
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-
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65(b)
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90(c)
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-
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-
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24" x 3/8" Straight-Split
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-
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-
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75(b)
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85
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100(c)
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15" Starter-Finish Course
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Use supplementary with shakes applied not over 10" weather exposure
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TABLE 3 NOTES:
a) Five bundles will cover 100 sq. ft. of roof area when used as starter-finish course at 10" exposure; see footnote (d).
b) Maximum recommended weather exposure for 3-ply roof construction.
c) Maximum recommended weather exposure for two-ply roof construction.
d) All coverage based on an average½" spacing between shakes.
e) Maximum recommended weather exposure.
f) While most shakes are packed in bundles of nine courses each side (9/9) they may be packed 12/12 or 15/15. This will alter the number of bundles required to cover one square. For example:
18" shake bundles 9/9 pack = 7 bundles per square, 12/12 pack = 5 bundles per square, 15/15 pack = 4 bundles per square. When ordering, check with your supplier to confirm bundle size.
*100 sq. ft. coverage is based on 12/12 pack, 5 bundle square, at 7½" exposure.
TABLE 4 - Shake Exposure
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SLOPE
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Maximum exposure recommended for roofs
LENGTH
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18”
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24”
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4:12 and steeper
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7 ½”
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10” (a)
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(a) 24 x 3/8” hand-split shakes limited to 7 ½” maximum weather exposure per UBC and IBC
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Formula for calculating material at reduced exposures:
Square footage divided by reduced coverage = total material required
Example: you are estimating a roof that measures 3200 square feet (32 squares). You have decided to put 16" Certigrade shingles (No. 1 Blue Label or No. 2 Red Label) at 4" exposure. The above coverage table (Table 1) tells you that a 4-bundle square at 4" exposure covers 80 square feet. 3200 divided by 80 = 40 squares of material.
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