The amount of slates you need per square metre (m2) depends on which slate size you’re using. For example, if you’re using a 20" × 10" slate (500mmx250mm), you will require 21 slate per m2. A 24" × 12" slate (600mmx300mm) requires only 13 slate per m2. These figures tend to be slightly different throughout the industry, but we, along with all of our roofing merchants, believe the following figures to be the most accurate:
- 14" x 10"
- 14" x 12"
- 16" × 8" (400mmx200mm) = 29 slate per m2
- 16" × 9"
- 16×10 (400mmx250mm) = 27 slate per m2
- 16" × 12" (400mmx200mm)
- 16" × 14" (400mmx200mm)
- 18×9 (450mmx250mm)
- 18×10 (450mmx250mm) = 23 slate per m2
- 18×12 (450mmx250mm) =
- 20×10 (500mmx250mm) = 21 slate per m2
- 20×12 (500mmx250mm) =
- 24×12 (600mmx300mm) = 13 slate per m2
If you know the surface area of your roof, you can use our simple email our roofing specialist team to give you the exact amount of slates you require to complete the job.
Welsh Tonner Slate
Westmorland Roofing Slate
Yorkshire Stone Greys Roof Slate
Please Note: These figures do not allow for any wastage, therefore we recommend adding a further 5%-10% on top of your order to account for this.
