Minimum Angle For Tiled Roof

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.

Minimum angle for tiled roof.

The lowest any tile can usually go is about 15 degrees but some must be steeper. Ratios from that minimum up to 4 12 which are considered low pitch require double underlayment. Low pitches are often found on extensions to properties where the angle of the roof is limited due to obstructions such as second floor windows. This means for every 12 horizontal units the roof must rise a minimum of two and one half vertical units.

The irc recommends a minimum pitch of 2 5 12 for these materials. 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. In traditional home construction it was not recommended to have a roof pitch lower than 20.

You can also read more about the reasons for choosing low pitch tiles and the requirements in our blog. Clay and concrete roof tiles can only be installed on roof slopes of 2 1 2 12 or greater. 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. Clay tiles are colorfast which means their tints improve rather than fade over time.

Although the minimum roof pitch for residential homes may vary depending on city and state building codes.