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TABLE 1 - Shingle Coverage
LENGTH AND THICKNESS Approximate coverage, in square feet, of one square (four bundles) of shingles based on following weather exposures
3½"
4"
4½"
5"
5½"
6"
6½"
7"
7½"
16" X 5/2"
70
80
90
100*
18" X 5/2.25"
72½
81½
90½
100*
24" x 4/2"
73½
80
86½
93
100*
Note: *Maximum exposure recommended for roofs

TABLE 2 - Shingle Exposure
SLOPE
3:12 to 4:12
4:12 and steeper
Maximum exposure recommended for roofs
LENGTH
NUMBER ONE BLUE LABEL NUMBER TWO
RED LABEL 		NUMBER THREE
BLACK LABEL
16"
18"
24"
3¾"
4¼"
5¾"
5"
5½"
7½"
16"
18"
24"
3½"
4"
5½"
4"
4½"
6½"
16"
18"
24"
3"
3½"
5"
3½"
4"
5½"

TABLE 3 - Shake Coverage see footnote (f) below
SHAKE TYPE, LENGTH AND THICKNESS Approximate coverage (in sq. ft.) of one square, when shakes are applied with an average½" spacing, at the following weather exposures, in inches (d):
5"
5½"
7½"
8½"
10"
18" x½" Handsplit-and-Resawn Mediums (a)*
-
75(b,f)
100(f,c)
-
-
18" x 3/4" Handsplit-and-Resawn Heavies (a)*
-
75(b,f)
100(f,c)
-
-
18" x 5/8" Tapersawn*
-
Approx 75(b)
100(f,c)
-
-
24" x 3/8" Handsplit
-
-
75(e)
-
-
24" x½" Handsplit-and-Resawn Mediums
-
-
75(b)
85
100 (c)
24" x 3/4" Handsplit-and-Resawn Heavies
-
-
75 (b)
85
100 (c)
24" x½" Tapersawn
-
-
75 (b)
85
100 (c)
24" x½" Tapersplit
-
-
75 (b)
85
100 (c)
18" x 3/8" Straight-Split
-
65 (b)
90 (c)
-
-
24" x 3/8" Straight-Split
-
-
75 (b)
85
100 (c)
15" Starter-Finish Course
Use supplementary with shakes applied not over 10" weather exposure

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 12 courses each side (12/12) they may be packed 9/9 . This will alter the number of bundles required to cover one square. For example:
18" shake bundles 12/12 packshould cover 100 square feet at 7 1/2" exposure. 9/9 pack should give 75% coverage of a square. Check with your supplier to confirm specific packaging (bundle size) used for your order.

*100 sq. ft. coverage is based on 12/12 pack, 5 bundle square, at 7½" exposure.
 
 

TABLE 4 - Shake Exposure
SLOPE
Maximum exposure recommended for roofs
LENGTH
 
4:12 and steeper
18"
24"
7½"
10" (a)
(a) 24 x 3/8" handsplit shakes limited to 7½" maximum weather exposure per UBC and IBC

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.