How many slates do you need per square?

High x With	Pieces per square
24 x 14	98
24 x 12	115
22 x 14	108
22 x 12	126
22 x 11	137
20 x 14	121
20 x 12	141
20 x 11	154
20 x 10	170
18 x 14	137
18 x 12	160
18 x 11	175
18 x 10	192
18 x 09	213
16 x 14	158
16 x 12	185
16 x 10	222
16 x 09	246
16 x 08	277
14 x 14	187
14 x 12	218
14 x 10	262
14 x 09	290
14 x 08	327
14 x 07	374
13 x 09	320
12 x 12	267
12 x 10	320
12 x 09	355
12 x 08	400
12 x 07	457
12 x 06	534

Slate Definition | Roofing slate maintenance | SLATE natural benefits