Slate International

Care should be taken in the selection of shingle size. Small differences of as little as an inch or two in length or width can significantly affect availability or price. Extreme sizes, large or small, can be difficult to fabricate and may not always be available. Generally, larger slates cost more and take longer to produce. It behooves the slate purchaser to be flexible in the selection of slate size as this can allow purchase from inventory, securing the best availability. Certain sizes and colors can require several weeks, even months, to produce. Inquire early to be sure your slate will be on hand when you need it.

Certain colors are available in optimal sizes -- sizes which are easier to produce, according to the particular properties of the quarry and stone. To learn more, click on colors/shapes, then click on the picture of the color that interests you.

The following table shows standardized US sizes of slate shingles (not all sizes are available in all colors):

TABLE 1

SCHEDULE OF STANDARD ROOFING SIZES
Standard thickness 3/16 inch;
Other thicknesses available

sizes of
slate, in.

no. in
each sq.

exposure
with
3 in. lap

approximate
nails needed
per square

lbs.

ozs.

24x16

24x14

24x13

24x12

24x11

106

114

125

10½ in.

1	0
1	2
1	3
1	5
1	7

22x14

22x13

22x12

22x11

22x10

108

117

126

138

152

9½ in.

1	4
1	5
1	7
1	9
1	12

20x14

20x13

20x12

20x11

20x10

20x 9

121

132

141

154

170

189

8½ in.

1	6
1	8
1	10
1	12
1	15
2	3

18x14

18x13

18x12

18x11

18x10

18x 9

137

148

160

175

192

213

7½ in.

1	9
1	11
1	13
2	0
2	3
2	7

16x14

16x12

16x11

16x10

16x 9

16x 8

160

184

201

222

246

277

6½ in.

1	13
2	2
2	6
2	8
2	13
3	2

14x12

14x11

14x10

14x 9

14x 8

14x 7

218

238

261

291

327

374

5½ in.

2	8
2	11
3	3
3	5
3	12
4	4

12x10

12x 9

12x 8

12x 7

12x 6

320

355

400

457

533

4½ in.

3	10
4	1
4	9
5	3
6	1

TABLE 2

WEIGHTS

3/16"-1/4"	650-1000 lbs. per square
1/4"-3/8"	1000-1500 lbs. per square
3/8"-1/2"	1500-2000 lbs. per square
1/2"-3/4"	2000-3000 lbs. per square

Notice: All information is thought to be accurate but is not guaranteed and is subject to change without notice.