The minimum roof slope allowed by code for any type of roof is in 12 applicable only to coal tar pitch roof systems.
Shingle roof slope.
This means for every 12 horizontal units the roof must rise a minimum of 3 vertical units.
Asphalt shingles continue to be the most widely installed roof covering option in north america.
The roof pitch between 2 12 and 4 12 is considered as a low pitch roof so shingles can be installed in the roof slope between 2 12 and 4 12.
The minimum requirement is 2 12.
The roof shingle calculator is a free estimator that serves a useful purpose during any roof repair or replacement project.
For example if it is a very low slope water including snowmelt or rainwater drains slowly and this increases the chances of.
Shingles of all types need to have a slope to function properly.
The 2 12 number is rise over run or two units of vertical for every 12 units horizontal.
What is the minimum slope for an asphalt shingle roof.
Why is 2 12 the minimum.
That works out to about nine degrees if that works better for you.
Metal roof shingles can only be installed on roof slopes of 3 12 or greater 25 slope.
Considering the roof slope requirement is important.
The following table provides the minimum required allowable roof slope for each type of roofing material mentioned in the code.