The irc recommends a minimum pitch of 2 5 12 for these materials.
Minimum pitch for slate roof tiles.
Mineral surfaced roll roofing requires a minimum roof pitch of 1 12 or greater.
Slate and slate type shingles require a minimum roof pitch of 4 12 or greater.
Sandtoft double pantile concrete tile.
Ratios from that minimum up to 4 12 which are considered low pitch require double underlayment.
Guidance on these components can be found in british standard bs 5534 2014 the code of practice for slating and tiling.
All tiles and slates have a minimum roof pitch which is set out in order to protect the roof from water penetration.
What is the minimum pitch for a slate roof.
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.
The minimum pitch for each product can be found in the table below and in the product brochure or within the products pages some tiles and slates incorporate design features allowing them to be laid at a low minimum pitch.
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.
Weight of slates kg area of roof m 2 slate.
The slate coverage per m2 can be found from table 2 23 9.
Clay tiles are colorfast which means their tints improve rather than fade over time.
Type of slate being used.
And our brand new mendip 12 5 can be used at an even lower pitch of 12 5 restrictions on rafter length may apply.
Our melodie interlocking clay pantile can be used in roof pitches as low as a 12 5 our wessex and mendip concrete roof tiles can be used down to a minimum 15 pitch.
The minimum roof slope allowed by code for any type of roof is in 12 applicable only to coal tar pitch roof systems.
The total weight of slates on roof can be found from the formula.
It is generally accepted that the lower the pitch the larger the headlap should be.
Concrete is long lasting with a minimum lifespan of 50 years depending on climate.
Metal roof shingles require a minimum roof pitch of 3 12 or greater.
When designing or altering the pitch of a slate roof common weather conditions should be one of the first considerations.
Pitch 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.
Size of the lap.
The following table provides the minimum required allowable roof slope for each type of roofing material mentioned in the code.
Size of the slate.
Higher exposure or different sized slates necessitated a greater roof pitch of 22 5 or more.
What are the minimum pitches for clay or concrete tiles.
