Roof pitch is used to describe the slope or angle of the roof.
Minimum gable roof pitch.
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.
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.
Normal roof slope for typical installation.
Pitched roofs begin with with slopes greater than 3 in 12.
If 4 12 and above is normal and 2 12 is minimum what about properties with roofs in between the two such as a 3 12 pitched roof.
The minimum pitch for a roof is 1 4 12 which translates to 1 4 inch rise to 12 inches of run.
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.
However you can only use this pitch with built up roofing or specialized synthetic roofing.
They provide excellent weather resistance great value and now more than ever a tremendous range of beautiful designs and color blends.
A minimum pitch of 3 in 12 or even 4 in 12 will normally be required.
Importance of a roof pitch.
The way pitch also known as roof slope is measured is rise over run.
Roof pitch or slope is a measure of vertical rise to horizontal run expressed in inches per foot.
The short simple answer is 2 12 has traditionally been considered the absolute minimum acceptable roof slope suitable for asphalt shingles.
Normal shingle installation is allowed for all roofs with a pitch of 4 12 and above.
Another widely used method is to follow the house s roof pitch on one side building the ridge off center then sloping down more drastically on the shorter side which will be closer to the house.
The roof pitch is important in determining the appropriate installation method and how much roofing material will be needed.
The minimum roof slope allowed by code for any type of roof is in 12 applicable only to coal tar pitch roof systems.
Suitable materials for pitched roofs.
So if your roof rises 4 inches for every 12 inches of horizontal length then the pitch of your roof is expressed as 4 12.
A ratio is the most common way of expressing roof pitch or roof slope but degrees are also possible.
Low sloped roof shingle installation.
The 45 degree roofs seen on a frame houses are 12 in 12 but roofs.
The values given here.
The following table provides the minimum required allowable roof slope for each type of roofing material mentioned in the code.
This can be a nice look even when it is turned with the gable end to the house and the door is under the short pitch rather than a gable end.
A gable roof is a traditional triangle shaped roof that can range from a medium pitch to sharp angled roofs.
