Minimum Pitch For Slate Roof Uk

Size nominal minimum rafter pitch mm 600 x 350 600 x 300 550 x 300 500 x 300 500 x 250 450 x 300 450 x 250 400 x 300 400 x.

Minimum pitch for slate roof uk.

Slates 450mm long or less should not be used at pitches of 27 5 degrees or less moderate severe exposure bs 5534 2014 page 45. Our melodie interlocking clay pantile can be used in roof pitches as low as a 12 5 our wessex and mendip concrete roof tiles can be used down to a minimum 15 pitch. And our brand new mendip 12 5 can be used at an even lower pitch of 12 5 restrictions on rafter length may apply. 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.

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 20 0 for slate roofs. Low pitches are often found on extensions to properties where the angle of the roof is limited due to obstructions such as. The slate coverage per m2 can be found from table 2 23 9.

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. Some tiles and slates incorporate design features allowing them to be laid at a low minimum pitch. What are the minimum pitches for clay or concrete tiles. Unlike many other roofing products welsh slate is entirely produced in the uk.

Higher exposure or different sized slates necessitated a greater roof pitch of 22 5 or more. In addition all products are produced to the exacting. The total weight of slates on roof can be found from the formula. The minimum pitch for each product can be found in the table below and in the product brochure or within the products pages.

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. 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. Weight of slates kg area of roof m 2 slate. The minimum roof pitch for natural slates is 20 degrees bs 5534 2014 page 45 depending on size of slate see table above bs 5534 2014 page 45 table 9.

Our roofing slate is 100 natural and has a low carbon footprint to the uk market. The general recommendation for the minimum pitch for natural slate is 25.