15 17 5 4m max.
Minimum pitch for eternit slate roof.
Formerly under the brand name of eternit we are the uk s most experienced company when it comes to fibre cement slates and are proud to have been putting roofs over heads for decades.
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.
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.
35 17 5 17 5 smooth 22 5 smooth 15 smooth 22 5 smooth 30 22 5 15 25 smooth 22 5.
Higher exposure or different sized slates necessitated a greater roof pitch of 22 5 or more.
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.
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.
Wood shingles require a minimum roof pitch of 3 12 or greater.
6m rafter length severe exposure.
14 8 slates m at 150mm headlap.
The following table provides the minimum required allowable roof slope for each type of roofing material mentioned in the code.
25 minimum pitch 110mm lap.
Wood shakes require a minimum roof pitch of 3 12 or greater.
Please contact our technical advisory service.
Severe exposure 22 5 low pitch application minimum pitch 110mm lap.
17 5 20 6m max.
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.
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.
17 5 150mm lap max 9m rafter length the minimum recommended pitch and lap maybe influenced by special circumstances.
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.
Mineral surfaced roll roofing requires a minimum roof pitch of 1 12 or greater.
Minimum pitch minimum pitch 100mm lap.
With regards to the pitch the building standard code bs 5534 recommends a minimum pitch of 20 0 for slate roofs.
Built up roofs require a minimum roof pitch of 1 4 12 or greater.
