Slate Roof Minimum Pitch Uk

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. The general recommendation for the minimum pitch for natural slate is 25. 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.

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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.

Slate roof minimum pitch uk.

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. Low pitches are often found on extensions to properties where the angle of the roof is limited due to obstructions such as. 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. Higher exposure or different sized slates necessitated a greater roof pitch of 22 5 or more.

With regards to the pitch the building standard code bs 5534 recommends a minimum pitch of 20 0 for slate roofs. The minimum pitch for each product can be found in the table below and in the product brochure or within the products pages. 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. 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.

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. Some tiles and slates incorporate design features allowing them to be laid at a low minimum pitch.