Run in degrees and as percentage the minimum roof slope allowed by code for any type of roof is in 12 applicable only to coal tar pitch roof systems.
1 in 3 roof slope.
That s the same as a 14 degree slope or a 25 slope.
Roof slopes in degrees percentage and rise in run rise over run.
The horizontal change in distance or the horizontal distance covered by an un supported rafter or truss.
Places that use metric measurement systems use a degree angle or what fall there is per unit of run and expressed as a 1 in slope a 1 in 1 equals 45.
You can assess this in two ways either as the roof pitch angles which the rafters make with the horizontal or the proportion between the run and the rise of the roof.
Remember slope is expressed as a ratio and in inches per foot.
Low slope roofs are from 0 to 3 12 in pitch.
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The table shows the equivalent ways of expressing the same roof pitch slope.
Where convenient the least common multiple is used e g a 3 in 4 slope for a 9 in 12 or 1 in 1 1 3.
Roof slope equivalents as rise.
The following table provides the minimum.
And pitch is a fraction derived by dividing the rise by the entire span.
The minimum roof slope for metal roof panels depend on 3 different scenarios.
Roof pitch refers to the slope which the rafter creates.
This page also explains how to convert one to another.
A 3 in 12 roof rises 3 for every 12 of run.
If the pitch is 1 3 the slope is 8 12.
Lapped nonsoldered seam metal roofs without applied lap sealant must have a minimum roof slope of 3 12 25 slope.
Slope conversion tables 1 4 1 2 3 4 1 1 1 4 1 1 2 1 3 4 2 2 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 0 25 0 50 0 75 1 00 1 25 1 50 1 75 2 00 2 25 3 4 5 6 7 8 9 10.
Why is the roof slope 25.
Some sources consider low slope to include 3 12 pitch roofs.
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