Maximum Pitch For Slate Roof

What is the maximum roof pitch for a roof tile.

Maximum pitch for slate roof.

It is agreed that the roof pitch should be a minimum of 20 degrees preferably a bit 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. 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. Our suggestion is not to contemplate using slates on roofs with a pitch less than 20 degrees and then only for big format slates eg 500x300mm.

You consider some alternative solutions. Higher exposure or different sized slates necessitated a greater roof pitch of 22 5 or more. 11 august 2015 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. The slope of a roof is often referred to as the roof s pitch.

Roof tiles and slates are very versatile products and can be used on a variety of roof pitches. Tiles or slates can be used at pitches up to 90 degrees vertical provided a clip is available to securely clip the tail of the tile available for most tiles.