In massachusetts minimum roof pitch must take into account the roofing material and is defined by the state department of public safety.
Minimum roof pitch massachusetts.
780 cmr 1505 0 fire classification 1505 1 general.
Roof cover ings installed on low slope roofs roof slope 2 12 in ac corda nce with 780 cmr 1507 shall resist impact damage based on the results of tests conduc ted in acc ordanc e with ast m d 3746 ast m d 4272 cgsb 37 gp 52m or fm 4470.
Pitch is typically expressed as a ratio of the number of rising units to the number of 12 horizontal units since there are 12 inches to a foot.
The short simple answer is 2 12 has traditionally been considered the absolute minimum acceptable roof slope suitable for asphalt shingles.
So you would need to pick the right option as most regular standing seam metal roofs will require a roof pitch of 2 12 or even 3 12 at a minimum.
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.
There are some standing seam metal roofing options available from atas and other manufacturers that can be installed on a roof with pitch of 1 12.
The profile is the shape taken by the sheets when you bend them to form panels.
The metal roof minimum slope doesn t stray far from other building with different material.
The following table provides the minimum required allowable roof slope for each type of roofing material mentioned in the code.
They provide excellent weather resistance great value and now more than ever a tremendous range of beautiful designs and color blends.
The minimum pitch is typically 3 12 meaning the roof should rise 3 inches for every 12 inches of horizontal foot.
Asphalt shingles continue to be the most widely installed roof covering option in north america.
The values given here.
The way pitch also known as roof slope is measured is rise over run.
Roof pitch is the measurement of roof steepness.
Express the slope of a metal roof by a ratio which indicates the pitch of the roof.
A ratio is the most common way of expressing roof pitch or roof slope but degrees are also possible.
Roof assemblies shall be divided.
The minimum slope of a roof depends on the roof s profile.
The minimum pitch for a roof is 1 4 12 which translates to 1 4 inch rise to 12 inches of run.
Importance of a roof pitch.
The minimum roof pitch is also subject to the standards set forth by the various building codes used in the respective regions.
You need to consider the slope requirements of each panel to determine this minimum slope.
You could also opt for a pvc flat roofing membrane.
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.
