Minimum recommended headlaps roofing the recommendations for minimum pitches and laps for slate tiles apply to normal situations.
Minimum pitch for blue slate roof.
The slope of a roof is often referred to as the roof s pitch.
But since there is still a wide variety of slate roofing systems there are occasions when the minimum pitch can go down to as low as 15 0 depending on the uniqueness of the roof.
Slate and slate type shingles require a minimum roof pitch of 4 12 or greater.
What are the minimum pitches for clay or concrete tiles.
Mineral surfaced roll roofing requires a minimum roof pitch of 1 12 or greater.
Size of the lap.
The recommendations shown above are based on a maximum height to eave of 12m and a maximum rafter length of 9m in moderate exposure and 6m in severe exposure.
With regards to the pitch the building standard code bs 5534 recommends a minimum pitch of 20 0 for slate roofs.
Minimum roof pitch for shingles.
Guidance on these components can be found in british standard bs 5534 2014 the code of practice for slating and tiling.
You consider some alternative solutions.
Size of the slate.
A couple of likely slate suppliers are consulted and they confirm that they are happy to supply 600x300mm slates for a minimum roof pitch of 20 degrees assuming a minimum lap of 125mm.
It is agreed that the roof pitch should be a minimum of 20 degrees preferably a bit more.
Minimum pitch for slate roof when considering the minimum pitch for a slated roof it is necessary to establish the exposure of the site the length of rafter and the height of the building.
As per the nrca roofing and waterproofing manual fifth edition they recommend that roof deck slopes intended for the application of steep slope materials at 4 12 18 degrees or greater page 405.
Generally a slate roof is not installed on a pitch less than 4 12.
Wood shakes require a minimum roof pitch of 3 12 or greater.
Higher exposure or different sized slates necessitated a greater roof pitch of 22 5 or more.
Wood shingles require a minimum roof pitch of 3 12 or greater.
There are some manufacturers that can go slightly lower such as the siga 56m natural slate which can go down to 20 in some instances if used with slate hook systems.
Pitch of the roof.
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.
Type of slate being used.
Our melodie interlocking clay pantile can be used in roof pitches as low as a 12 5 our wessex and mendip concrete roof tiles can be used down to a minimum 15 pitch.
In general the recommendations apply to rafter lengths of not more than 9m in driving rain exposures of less than 56l m2 per spell and 6m in driving rain exposures greater than 56 l m2 per spell.
The general recommendation for the minimum pitch for natural slate is 25.
