Slate Roof Minimum Pitch Uk

With regards to the pitch the building standard code bs 5534 recommends a minimum pitch of 20 0 for slate roofs.

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. 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. 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. 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. 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. Low pitches are often found on extensions to properties where the angle of the roof is limited due to obstructions such as. Some tiles and slates incorporate design features allowing them to be laid at a low minimum pitch.

Higher exposure or different sized slates necessitated a greater roof pitch of 22 5 or more. The minimum pitch for each product can be found in the table below and in the product brochure or within the products pages.