The rise and the length.
Slate tile roof pitch.
Roof pitch is a term used in the roofing industry to describe the angle slope of a roofing structure.
Higher exposure or different sized slates necessitated a greater roof pitch of 22 5 or more.
Conventional low pitch slate roofs are recommended down to a minimum of 20 in areas of sheltered or moderate exposure providing a 500x300mm slate is used and a headlap of 115mm.
Slate tile requires a pitch of 4 12 or greater.
The pitch of a roof is determined by 2 numbers.
When slating with a shallow pitch a wide slate is highly recommended for maximum side lap or lateral lap side overlaps.
For tile shingle slate and metal roofing.
In order to provide you with the opportunity to specify low pitched slate roofs below 20 with confidence siga commissioned the bre to carry out a set of tests.
Most commonly a roof pitch will be from 0 flat to 12 45.
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.
Traditionally a minimum roof pitch of 20 was recommended in bs 5534 but modern tiles and slates have now been designed for applications as low as 15.