How many slates per square metre (m2)?
This table shows the required number of slates per square metre for effective coverage.
The number of roof slates that are needed depends on the slate size and the headlap in mm.
For example; If we are using a 600 x 300mm slate (24″ x 12″) with a headlap of 90 mm we would need 13 slates tiles per m2.
| Quantity of Slates | ||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Slate Size | Lap mm | |||||||||||
| (Nominal) mm | 50 | 65 | 75 | 80 | 90 | 100 | 110 | 115 | 120 | 130 | 140 | 150 |
| 600 x 300 | 12.1 | 12.5 | 12.7 | 12.8 | 13.1 | 13.3 | 13.6 | 13.7 | 13.9 | 14.2 | 14.5 | 14.8 |
| 500 x 300 | 14.8 | 15.3 | 15.7 | 15.9 | 16.3 | 16.7 | 17.1 | 17.3 | 17.5 | 18.0 | 18.5 | 19.0 |
| 500 x 250 | 17.8 | 18.4 | 18.8 | 19.0 | 19.5 | 20.0 | 20.5 | 20.8 | 21.0 | 21.6 | 22.2 | |
| 450 x 300 | 16.7 | 17.3 | 17.8 | 18.0 | 18.5 | 19.0 | 19.6 | 19.9 | 20.2 | 20.8 | 21.5 | |
| 400 x 250 | 20.2 | 20.8 | 21.3 | 21.6 | 22.2 | 22.9 | 23.5 | 23.9 | 24.2 | 25.0 | 25.8 | |
| 450 x 230 | 21.7 | 22.6 | 23.2 | 23.5 | 24.2 | 24.8 | 25.6 | 26.0 | 26.3 | 27.2 | 28.1 | |
| 400 x 300 | 19.0 | 19.9 | 20.5 | 20.8 | 21.5 | 22.2 | 23.0 | 23.4 | 23.8 | |||
| 400 x 250 | 22.9 | 23.9 | 24.6 | 25.0 | 25.8 | 26.7 | 27.6 | 28.1 | 28.6 | |||
| 400 x 200 | 28.6 | 29.9 | 30.8 | 31.3 | 32.3 | 33.3 | 34.5 | 35.1 | 35.7 | |||
| 350 x 300 | 22.2 | 23.4 | 24.2 | 24.7 | 25.6 | 26.7 | 27.8 | |||||
| 350 x 250 | 26.7 | 28.1 | 29.1 | 29.6 | 30.8 | 32.0 | 33.3 | |||||
| 350 x 200 | 33.3 | 35.1 | 36.4 | 37.0 | 38.5 | 40.0 | 41.7 | |||||
| 320 x 220 | 33.7 | 35.7 | 37.1 | 37.9 | 39.5 | 41.3 | 43.3 | |||||
| 320 x 180 | 41.2 | 43.6 | 45.4 | 46.3 | 48.3 | 50.5 | 53.0 | |||||
| 300 x 200 | 40.0 | 42.6 | 44.4 | 45.5 | 47.6 | 50.0 | ||||||
| 300 x 150 | 53.3 | 56.7 | 59.3 | 60.6 | 63.5 | 66.7 | ||||||
