It is agreed that the roof pitch should be a minimum of 20 degrees preferably a bit more.
Minimum pitch for blue slate roof.
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.
Slate and slate type shingles require a minimum roof pitch of 4 12 or greater.
You consider some alternative solutions.
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.
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.
Minimum roof pitch for shingles.
Pitch of the roof.
Mineral surfaced roll roofing requires a minimum roof pitch of 1 12 or greater.
Higher exposure or different sized slates necessitated a greater roof pitch of 22 5 or more.
Wood shakes require a minimum roof pitch of 3 12 or greater.
Guidance on these components can be found in british standard bs 5534 2014 the code of practice for slating and tiling.
Size of the slate.
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.
The slope of a roof is often referred to as the roof s pitch.
Built up roofs require a minimum roof pitch of 1 4 12 or greater.
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.
With regards to the pitch the building standard code bs 5534 recommends a minimum pitch of 20 0 for slate roofs.
What are the minimum pitches for clay or concrete tiles.
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.
Generally a slate roof is not installed on a pitch less than 4 12.
Type of slate being used.
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.
Minimum recommended headlaps roofing the recommendations for minimum pitches and laps for slate tiles apply to normal situations.
And our brand new mendip 12 5 can be used at an even lower pitch of 12 5 restrictions on rafter length may apply.
The general recommendation for the minimum pitch for natural slate is 25.
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.
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.
