Mineral surfaced roll roofing requires a minimum roof pitch of 1 12 or greater.
Minimum pitch for eternit slate roof.
Severe exposure 22 5 low pitch application minimum pitch 110mm lap.
17 5 150mm lap max 9m rafter length the minimum recommended pitch and lap maybe influenced by special circumstances.
Slate and slate type shingles require a minimum roof pitch of 4 12 or greater.
Wood shakes require a minimum roof pitch of 3 12 or greater.
Please contact our technical advisory service.
Built up roofs require a minimum roof pitch of 1 4 12 or greater.
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.
Minimum pitch minimum pitch 100mm lap.
15 17 5 4m max.
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.
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 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.
14 8 slates m at 150mm headlap.
Wood shingles require a minimum roof pitch of 3 12 or greater.
17 5 20 6m max.
25 minimum pitch 110mm lap.
The minimum roof slope allowed by code for any type of roof is in 12 applicable only to coal tar pitch roof systems.
15 150mm lap max.
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 more cement and fibres than any other cedral slates are the strongest slates in the market and tough enough to withstand the most volatile weather.
With regards to the pitch the building standard code bs 5534 recommends a minimum pitch of 20 0 for slate roofs.
6m rafter length severe exposure.