Pitched Roof Extension Minimum Angle

Divide the first part of the ratio by 12 to work out the pitch.

Pitched roof extension minimum angle. 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. Asphalt shingles continue to be the most widely installed roof covering option in north america. The minimum roof pitches degrees that are required range between 15 to 22 degrees using the clay range of tiles and if the slate tiles are to be used then this range extends to 22 5 degrees. With regards to the pitch the building standard code bs 5534 recommends a minimum pitch of 200 for slate roofs.

With square shaped houses with pitched roofs a deep plan is considered very energy efficient these days a lesser pitch perhaps 42 5 can look fine on roofs that are hipped on all four sides pyramidal. But since there is still a wide variety of slate roofing systems there are occasions when the minimum pitch can go down to as low as 15 0 depending on the uniqueness of the roof. People think that it is not possible to construct a pitched roof kitchen extension. Low pitches are often found on extensions to properties where the angle of the roof is limited due to obstructions such as.

A 12 12 pitch roof has a pitch angle of 45. 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. Find the inverse tangent of the pitch to find the angle in degrees. Resist the spread of fire from one property to another.

But this is not true. Some tiles and slates incorporate design features allowing them to be laid at a low minimum pitch. The short simple answer is 2 12 has traditionally been considered the absolute minimum acceptable roof slope suitable for asphalt shingles. To convert between american roofing ratios and pitch degrees follow these steps.

In general this will look far better on single storey square shaped houses where the roof is bigger relative to the walls. The roof pitch calculator is a convenient online tool you can use to quickly assess the pitch of your roof to determine the length of rafters you need. After finding out your roof pitch angles you can use the calculator to perform the calculations for you instead of doing them manually. The minimum pitch for each product can be found in the table below and in the product brochure or within the products pages.