Coverage & 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
 
3½"
4"
4½"
5"
5½"
6"
6½"
7"
7½"
16" X 5/2"
70
80
90
100*
         
18" X 5/2¼"
 
72½
81½
90½
100*
       
24" x 4/2"
       
73½
80
86½
93
100*

Note: *Maximum exposure recommended for roofs

Table 2 - Shingle Exposure

    Maximum exposure recommended for roofs        
 LENGTH        
 SLOPE  Number One Blue Label  Number 2 Red Label  Number 3 Black Label
   16"  18"  24"  16"  18"  24"  16"  18"  24"
  3:12 to 4:12  3¾"  4¼"  5¾"  3½"  4"  5½"  3"  3½"  5"
 4:12 and steeper  5"  5½"  7½"  4"  4½"  6½"  3½"  4"  5½"

Table 3 - Shake Coverage

  Approximate coverage (in sq. ft.) of one square, when shakes are applied with an average½" spacing, at the following weather exposures, in inches (d):
SHAKE TYPE, LENGTH & THICKNESS
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" x ½" Handsplit-and-Resawn Mediums
-
-
75 (b)
85
100 (c)
24" x 3/4" Handsplit-and-Resawn Heavies
-
-
75 (b)
85
100 (c)
24" x 5/8" Tapersawn
-
-
75 (b)
85
100 (c)
24" x ½" 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" weather exposure; 7 bundles will cover 100 sq.ft. roof area at 7½" weather exposure; see footnote (d).
  • b) Maximum recommended weather exposure for 3-ply roof construction.
  • c) Maximum recommended weather exposure for 2-ply roof construction.
  • d) All coverage based on an average ½" 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 pack should cover 100 square feet at 7½" 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

   Maximum exposure recommended for roofs
 
 SLOPE  LENGTH 
   18"  24"
  4:12 and steeper  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.