Lapped nonsoldered seam metal roofs without applied lap sealant must have a minimum roof slope of 3 12 25 slope.
1 in 3 roof slope.
Roof slope equivalents as rise.
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.
Roof slopes in degrees percentage and rise in run rise over run.
And pitch is a fraction derived by dividing the rise by the entire span.
The horizontal change in distance or the horizontal distance covered by an un supported rafter or truss.
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Low slope roofs are from 0 to 3 12 in pitch.
A 3 in 12 roof rises 3 for every 12 of run.
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This page also explains how to convert one to another.
The minimum roof slope for metal roof panels depend on 3 different scenarios.
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.
Remember slope is expressed as a ratio and in inches per foot.
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.
Why is the roof slope 25.
Some sources consider low slope to include 3 12 pitch roofs.
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.
3 of rise per 12 of run is the same as 1 of rise per 4 of run or 1 4 25.
The table shows the equivalent ways of expressing the same roof pitch slope.
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.
If the pitch is 1 3 the slope is 8 12.
The following table provides the minimum.
That s the same as a 14 degree slope or a 25 slope.