The following tableprovides the minimum required allowable roof slope for each type of roofing material mentioned in the code.
Minimum pitch for tiles roof.
The irc recommends a minimum pitch of 2 5 12 for these materials.
Divide the results by the number of 12 inch segments in your level.
Clay and concrete tile requires a minimum roof pitch of 2 1 2 12 or greater.
Both clay and concrete tile are available in many colors and are naturally weather resistant.
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.
Let us recap on the minimum roof pitch required for each type of roofing material.
You can also estimate a roof pitch by eyeballing it from the ground from the gable side with a level and ruler.
Because of the long service life of tile a long lasting underlayment should be used as well.
For example if you used a 24 inch level and your measurement was 12 inches the pitch in your roof is 6 in 12.
Design considerations11 code considerations 12 standards 12 bushfire attack levels bal 12 wind forces 12 terrain categories 13 basic wind regions 14 fixing tile roofs in cyclonic regions 15 minimum roof pitch 15 maximum rafter lengths 15 maximum rafter lengths no sarking 15 sarking 16 insulation 16 ventilation 16.
Low pitches are often found on extensions to properties where the angle of the roof is limited due to obstructions such as.
Metal roof shingles require a minimum roof pitch of 3 12 or greater.
Underlayments play a key role in tile roofing since most tile roofs are not completely waterproof.
Asphalt shingles require a minimum roof pitch of 2 12 or greater.
What is the minimum slope for an asphalt shingle roof the short simple answer is 2 12 has traditionally been considered the absolute minimum acceptable roof slope suitable for asphalt shingles.
Asphalt shingles continue to be the most widely installed roof covering option in north america.
At a minimum use a type ii no.
The minimum pitch for each product can be found in the table below and in the product brochure or within the products pages.
Concrete is long lasting with a minimum lifespan of 50 years depending on climate.
Some tiles and slates incorporate design features allowing them to be laid at a low minimum pitch.
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.
In traditional home construction it was not recommended to have a roof pitch lower than 20.
However with modern roofing materials such as boral roofing tiles the minimum roof pitch can be as low as 15.
The minimum roof slope allowed by code for any type of roofis in 12 applicable only to coal tar pitch roof systems.
