Roof pitch multiplier table.
Slate roof tiles minimum pitch.
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 general recommendation for the minimum pitch for natural slate is 25.
Slate tile requires a pitch of 4 12 or greater.
Complete list of roofing types.
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.
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.
Some tiles and slates incorporate design features allowing them to be laid at a low minimum pitch.
All tiles and slates have a minimum roof pitch which is set out in order to protect the roof from water penetration.
We wanted a worry free beautiful best in class roof that could withstand future storms and we got it with our new davinci roof.
The slate coverage per m2 can be found from table 2.
Degrees to pitch rise in run table.
Roof slope equivalents as rise.
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.
Example slate type del carmen slate size mm mm 400 250 weight of slates kg 1000 1235 exposure moderate 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.
The minimum pitch for each product can be found in the table below and in the product brochure or within the products pages.
Run in degrees and as percentage the minimum roof slope allowed by code for any type of roof is in 12 applicable only to coal tar pitch roof systems.
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.
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.
Higher exposure or different sized slates necessitated a greater roof pitch of 22 5 or more.
Slate tiles whether natural or synthetic are expensive but they can add value to a home because of their appearance.
After terrible hail storms devastated hundreds of homes in our area we began seeing many impact resistant davinci composite roofs installed.
