What headlap should we use?

The headlap (or lap) required for your roof is dependent on the size of slate, pitch of roof, and location of the site in the UK. The more exposed the site and the lower the pitch of the roof, the greater the lap needs to be.

Follow our guidance in the Knowledge Base post ‘Design a Natural Slate Roof – Start Here’ to find out the exposure grading of your site and from there calculate the required headlap.