Although bs 5534 recommends a minimum pitch of 20 ssq has developed a successful slate roofing system that allows the roof s pitch to be reduced to 17 5 generally and under some circumstances as low as 15 in areas considered to be unexposed.
Slating a low pitch roof.
Size of the lap.
As low as 1 38 1 15.
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.
When slating with a shallow pitch a wide slate is highly recommended for maximum side lap or lateral lap side.
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Mineral surfaced roll roofing requires a minimum roof pitch of 1 12 or greater.
Wood shakes require a minimum roof pitch of 3 12 or greater.
Wood shingles require a minimum roof pitch of 3 12 or greater.
As low as 1 20 1 00.
The best tiles and slates to cover low pitched roofs.
Built up roofs require a minimum roof pitch of 1 4 12 or greater.
Siga 65 slate roofs installed to the correct specification would attract the usual 30 year warranty.
For low pitch slate roofs you should specify siga 65slates from our commercial range sized at 500x300mm and supplied unholed for hook fixing.
Type of slate being used.
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Marley mendip tile 123.
Marley wessex tile 106.
As low as 2 10 1 75.
Size of the slate.
Pitch of the roof.
Slate and slate type shingles require a minimum roof pitch of 4 12 or greater.
Easy slate vastly improves the performance of the slates enabling roof pitches as low as 12 degrees.