What roof pitch do i need for what slate size generally speaking 20 degrees is the lowest advisable pitch for a slate roof depending on the size of the slates and how much that the roof is exposed to moderate weather conditions.
How to set out a slate roof.
Although a slate roof is initially quite costly it will often last for a lifetime and beyond.
Alternatively you could use a 12 inch high starter slate thereby guaranteeing a 3 5 inch headlap on the starter course and an 8 5 inch exposure on all field slates.
This can be carried out cheaply and it s work you can comfortably undertake yourself.
Roof battens and gauge the gauge is the space between the roof battens this will set the overlap of your chosen slate in most cases.