There are some general rules that can be applied to different types of tiles.
Minimum roof pitch for tiles.
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.
Although the minimum roof pitch for residential homes may vary depending on city and state building codes.
All tiles and slates have a minimum roof pitch which is set out in order to protect the roof from water penetration.
They provide excellent weather resistance great value and now more than ever a tremendous range of beautiful designs and color blends.
The chief reason for having a roof pitch is to redirect water and snow away from the roof and avoid any percolation that might result from stagnation of water on the roof.
In traditional home construction it was not recommended to have a roof pitch lower than 20.
Importance of a roof pitch.
The minimum roof pitch is also subject to the standards set forth by the various building codes used in the respective regions.
The irc recommends a minimum pitch of 2 5 12 for these materials.
Clay and concrete tile minimum roof slope roof pitch r905 3 2.
Ratios from that minimum up to 4 12 which are considered low pitch require double underlayment.
The international residential code irc specifies a minimum 4 12 pitch 4 inches of vertical rise for every 12 inches of horizontal run for a clay or concrete tile roof except that a pitch as low as 2 1 2 12 is allowed when two layers of underlayment are applied.
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.
What is the minimum pitch for a tiled roof.
Asphalt shingles continue to be the most widely installed roof covering option in north america.
Clay and concrete roof tiles can only be installed on roof slopes of 2 1 2 12 or greater.
The pitch is crucial in minimising the amount of time it takes for water and debris to clear from the roof.
Getting the right pitch for the roof will also play a big role in it performs long term.
The minimum roof slope allowed by code for any type of roof is in 12 applicable only to coal tar pitch roof systems.
The following table provides the minimum required allowable roof slope for each type of roofing material mentioned in the code.
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.
However with modern roofing materials such as boral roofing tiles the minimum roof pitch can be as low as 15.
Concrete is long lasting with a minimum lifespan of 50 years depending on climate.
