1 In 3 Roof 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.

1 in 3 roof 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. The horizontal change in distance or the horizontal distance covered by an un supported rafter or truss. Lapped nonsoldered seam metal roofs without applied lap sealant must have a minimum roof slope of 3 12 25 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. If the slope is 4 12 the pitch for the 24 foot span is 1 6. Some sources consider low slope to include 3 12 pitch roofs. The minimum roof slope for metal roof panels depend on 3 different scenarios.

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 slope equivalents as rise. Roof slopes in degrees percentage and rise in run rise over run. Roof pitch refers to the slope which the rafter creates.

Why is the roof slope 25. The table shows the equivalent ways of expressing the same roof pitch slope. That s the same as a 14 degree slope or a 25 slope. Low slope roofs are from 0 to 3 12 in pitch.

And pitch is a fraction derived by dividing the rise by the entire span. A 3 in 12 roof rises 3 for every 12 of run. 3 of rise per 12 of run is the same as 1 of rise per 4 of run or 1 4 25. The following table provides the minimum.

If asphalt shingles are to be installed on a low slope roof special steps are required to avoid short roof life and roof see. 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.