Coverage & Exposure Tables

ROOF COVERAGE AND EXPOSURE TABLES

TABLE 1 - Shingle Coverage

LENGTH AND THICKNESS	Approximate coverage, in square feet, of one square (four bundles) of shingles based on following weather exposures
Exposure	3 ½”	4”	4 ½”	5”	5 ½”	6”	6 ½”	7”	7 ½”
16" X 5/2"	70	80	90	100*
18" X 5/2.25"		72 ½	81 ½	90 ½	100*
24" x 4/2"					73 ½	80	86 ½	93	100*
*Note: Maximum exposure recommended for roofs**

TABLE 2 - Shingle Exposure

Maximum exposure recommended for roofs
LENGTH

NUMBER ONE BLUE LABEL

NUMBER TWO
RED LABEL

NUMBER THREE
BLACK LABEL

SLOPE

16”

18”

24”

16”

18”

24”

16”

18”

24”

3:12 to 4:12

3 ¾”

4 ¼”

5 ¾”

3 ½”

4”

5 ½”

3”

3 ½”

5”

4:12 and steeper

5”

5 ½”

7 ½”

4”

4 ½”

6 ½”

3 ½”

4”

5 ½”

TABLE 3 - Shake Coverage (f)

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)	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" 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 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

SLOPE

Maximum exposure recommended for roofs
LENGTH

18”

24”

4:12 and steeper

7 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.