TABLE 1 – SHINGLE COVERAGE

LENGTH AND THICKNESSMaximum exposure recommended for roofs Length
Exposure3 ½”4”4 ½”5”5 ½”6”6 ½”7”7 ½”
16″ X 5/2″708090100*
18″ X 5/2.25″72 ½81 ½90 ½100*
24″ x 4/2″73 ½8086 ½93100*
Note: *Maximum exposure recommended for roofs

TABLE 2 – SHINGLE EXPOSURE

LENGTH AND THICKNESSMaximum exposure recommended for roofs Length
NUMBER ONE BLUE LABELNUMBER TWO
RED LABEL
NUMBER THREE
BLACK LABEL
SLOPE16”18”24”16”18”24”16”18”24”
3:12 to 4:123 ¾”4 ¼”5 ¾”3 ½”4”5 ½”3”3 ½”5”
4:12 and steeper5”5 ½”7 ½”4”4 ½”6 ½”3 ½”4”5 ½”

TABLE 3 – SHAKE COVERAGE (F)

SHAKE TYPE, LENGTH AND THICKNESSApproximate 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)100(f,c)
18″ x 3/4″ Handsplit-and-Resawn Heavies (a)*55(b)75(f,c)
18″ x 5/8″ Tapersawn*Approx 75(b)100(f,c)
24″ x 3/8″ Handsplit75(e)
24″ x½” Handsplit-and-Resawn Mediums75(b)85100(c)
24″ x 3/4″ Handsplit-and-Resawn Heavies75(b)85100(c)
24″ x½” Tapersawn75(b)85100(c)
24″ x½” Tapersplit75(b)85100(c)
18″ x 3/8″ Straight-Split65(b)90(c)
24″ x 3/8″ Straight-Split75(b)85100(c)
15″ Starter-Finish CourseUse 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 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

SLOPEMaximum exposure recommended for roofs Length
18”24”
4:12 and steeper7 ½”10” (a)
(a) 24 x 3/8” hand-split shakes limited to 7 ½” 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.