Natural Slate Roof Pitch

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.

Natural slate roof pitch.

What is the minimum pitch for natural slate. 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. 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. The total weight of slates on roof can be found from the formula.

A welsh slate roof adds character and quality to any building. Unlike most other roofing materials and even slate from other quarries where sizes larger than 50 25 cannot be achieved ssq slate allows you to design roofs as low as 17 5 in pitch. 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. Following the successful test results we are happy to advise specifiers and contractors that they can choose a siga natural slate roof as low as 15 degrees sheltered or moderate exposure and 17 5 degrees severe exposure if the slates are hook fixed with a 150mm lap.

In addition below a 30º degree pitch the hooks should have crimped shanks to reduce the capillary rise of water at the perpendicular joints between slates. Where the thickness of natural slates reduces their pitch by 3 or more select the next lower rafter pitch to determine the recommended head lap and slate width. If you are looking for a roofing solution which involves a low pitch complex roof you have come to the right place. At burton roofing merchants we stock a wide range of cupa pizarras natural slate roofing tiles that are perfect for repairing your existing roof or installing a new sloping roof.

Weight of slates kg area of roof m 2 slate. 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 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. However hooks should not be used below a 25º roof pitch.

Slate is a natural material with unmatched technical features which lasts over 100 years. How easy is natural slate to install. Installing natural slate is a more specialist job than most other kinds of roof. Conclusions of the low pitch slate roof testing.

Welsh slate combines beautifully with traditional and modern materials and provides the designer with a choice of colours and a natural distinctive texture. An alternative method of fixing slates is the use of slate hooks.