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Standard Sizing for Slate Shingles

Standards 3/16-1/4″ 650-800 lbs./square
Quarters 1/4-3/8″ 800-1200 lbs./square
Heavies 3/8-1/2″ 1200-1800 lbs./square
Extra Heavies 1/2-3/4″ 1800-2500 lbs./square

 

SCHEDULE OF STANDARD SIZES
Slate size Inches Pieces per square at 3″ headlap Exposure at 3″ headlap
24 x 12 115 10.5″
22 x 12 126 9.5″
22 x 11 137
20 x 14 121 8.5″
20 x 12 141
20 x 11 154
20 x 10 170
18 x 14 137 7.5″
18 x 12 160
18 x 11 175
18 x 10 192
18 x  9 213  “
16 x 14 158 6.5″
16 x 12 185  “
16 x 11 201
16 x 10 222  “
16 x  9 246  “
16  x  8 277
14 x 12 218 5.5″
14 x 11 238
14 x 10 262
14  x  9 291
14  x 8 327
14  x  7 374
12 x 10 320 4.5″
12 x  8 400
12  x  6 534

PDFs