Minimum Angle For Slate Roof

There is no maximum pitch up to 90 degrees.

Minimum angle for slate roof.

You consider some alternative solutions. Roof pitch refers to the measurement of the slope of a roof and you express this as a ratio. Slate shingles can only be installed on roof slopes of 4 12 or greater 33 slope. 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.

It is agreed that the roof pitch should be a minimum of 20 degrees preferably a bit more. When slating with a shallow pitch a wide slate is highly recommended for maximum side lap or lateral lap side overlaps. 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. 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.

Higher exposure or different sized slates necessitated a greater roof pitch of 22 5 or more. It is uncommon to find a roof below 15 but for those very low pitch applications there are interlocking clay pantiles available suitable for use down to 12 5. Also redland cambrian interlocking slate which is very realistic will go down to 15 degrees. 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.

This means for every 12 horizontal units the roof must rise a minimum of 4 vertical units. 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. With regards to the pitch the building standard code bs 5534 recommends a minimum pitch of 200 for slate roofs.