How many slates do you need per m2?

The number of slates required per m2 will vary depending on the slate size and the headlap used and can therefore vary considerably.

For example:

• 400mm x 200mm = approximately 31/m2
• 400mm x 250mm = approximately 25/m2
• 500mm x 250mm = approximately 19/m2

If you know the size and headlap you can use our coverage tables to calculate the exact number directly.

To find out what size and headlap you require, follow our guidance on the Knowledge Base post ‘Design a Natural Slate Roof – Start Here’.