Minimum Pitch For Natural Slate Roof Uk

For exposed sites wide slates with a greater lap should be used whereas in sheltered areas roof pitches as low as 20 degrees can be achieved using a hook fixing system.

Minimum pitch for natural slate roof uk.

In order to provide you with the opportunity to specify low pitched slate roofs below 20 with confidence siga commissioned the bre to carry out a set of tests. The minimum recommended pitch for natural slate is 25 although this can be lowered down to 20 with products like the siga 56m natural slate and is also dependent on slate size. The minimum recommended pitch for a natural slate roof is 20 degrees under sheltered or. 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.

How easy is natural slate to install. The total weight of slates on roof can be found from the formula. Roof slate is strong and resistant to acid and frost. 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.

Installing natural slate is a more specialist job than most other kinds of roof covering. 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. 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. What is the minimum pitch for natural slate.

The slate coverage per m2 can be found from table 2 23 9. 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. Roof pitch 40 roof area m 2 150 length of roof slope m 9 5 the headlap can be found from table 1 by reference to slate size roof pitch and exposure 65 mm. Higher exposure or different sized slates necessitated a greater roof pitch of 22 5 or more.

It lasts up to 400 years as a roofing material.