Minimum Slope For Slate Roof

As per the nrca roofing and waterproofing manual fifth edition they recommend that roof deck slopes intended for the application of steep slope materials at 4 12 18 degrees or greater page 405.

Minimum slope for slate roof.

Wood shakes require a minimum roof pitch of 3 12 or greater. The following table provides the minimum required allowable roof slope for each type of roofing material mentioned in the code. Higher exposure or different sized slates necessitated a greater roof pitch of 22 5 or more. Wood shingles require a minimum roof pitch of 3 12 or greater.

The short simple answer is 2 12 has traditionally been considered the absolute minimum acceptable roof slope suitable for asphalt shingles. The profile is the shape taken by the sheets when you bend them to form panels. 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. Slate and slate type shingles require a minimum roof pitch of 4 12 or greater.

The slope of a roof is often referred to as the roof s pitch. 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. Minimum roof pitch is the lowest angle at which a roof can be designed so the roof covering remains watertight. With regards to the pitch the building standard code bs 5534 recommends a minimum pitch of 20 0 for slate roofs.

Generally a slate roof is not installed on a pitch less than 4 12. 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. Express the slope of a metal roof by a ratio which indicates the pitch of the roof.

The minimum roof slope allowed by code for any type of roof is in 12 applicable only to coal tar pitch roof systems. Asphalt shingles continue to be the most widely installed roof covering option in north america. What does minimum roof pitch mean. Mineral surfaced roll roofing requires a minimum roof pitch of 1 12 or greater.

The minimum slope of a roof depends on the roof s profile. Built up roofs require a minimum roof pitch of 1 4 12 or greater. You need to consider the slope requirements of each panel to determine this minimum slope. 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.