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.
Minimum angle for pitched roof uk.
For lots more information on which roof finish to use for which slope and indicative costs.
For slopes below 20 degrees systems such as epdm fibreglass metal roofing can be used.
Use a pitch of more than ten degrees for more efficient rain protection.
Choosing the right pitch.
In the uk the typical house has a pitch between 40 50 although 45 should be avoided.
Pitch roof this is where tiles or slates are used and a void is usually created underneath.
The minimum pitch for a roof is 1 4 12 which translates to 1 4 inch rise to 12 inches of run.
To enable compliance with the requirements of the building regulations to be demonstrated full details of the new roof will be needed including.
There is no standard universal roof pitch.
More modern tiling and felt shingle systems can achieve lower slopes down to about 20 degrees.
However you can only use this pitch with built up roofing or specialized synthetic roofing.
After finding out your roof pitch angles you can use the calculator to perform the calculations for you instead of doing them manually.
A pitch of 10 degrees or less is typically regarded as a flat roof.
A flat roof is more likely to allow rain to pool and this can cause damage especially if the roof is made of a porous substance like wood.
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.
A low pitched roof is anything that is any roof with a pitch of 3 12 or less.
With regards to the pitch the building standard code bs 5534 recommends a minimum pitch of 20 0 for slate roofs.
35 is considered to be the minimum for slate and clay but if you do need to go below this interlocking concrete tiles are the best option.
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.
In the usa the range of standard pitches is anywhere between 4 12 and 9 12.
More commonly roll on membranes such that use heat to bond seams together is used as a roofing material.
Many roofing shingles do not allow applications onto roofs at this pitch.
Flat roof this usually consists of felting which has a slight fall to allow rain water to drain off.
A relatively steep pitch in excess of 40 degrees to be waterproof.
Minimum roof pitch for shingles.
Roof pitch varies depending on culture climate style and available materials.
