1 12 Roof Slope

The minimum slope for lapped non soldered seam metal roofs with applied lap sealant shall be one half unit vertical in 12 units horizontal 4 percent slope.

1 12 roof slope.

A 4 12 slope is enough to accommodate water runoff but is not suitable for regions that are. This forms an angle of 18 5 between the horizontal section and the roof and creates a gentle incline that is seen as a midpoint between a low pitch and medium pitch roof. This means for every 12 horizontal units the roof must rise a minimum of 1 vertical unit. The minimum slope for lapped non soldered seam metal roofs without applied lap sealant shall be three units vertical in 12 units horizontal 25 percent slope.

1 12 roof pitch angle 4 76 degrees. If the rise is 6 inches for every 12 inches of run then the roof slope is 6 in 12 the slope can be expressed numerically as a ratio. If a roof rises 1 in a length of 12 this is 1 12 roof pitch. Simply locate a roof rafter board place the end of the level against the bottom edge and measure from the 12 inch mark vertically to the bottom edge of the rafter.

This measurement is best done on a bare roof because curled up roofing shingles will impair your measurement. Then you ll be able to measure slope from an unfinished attic space under the roof. Mineral surfaced roll roofing can only be installed on roof slopes of 1 12 or greater 8 slope. With insufficient pitch a roof can leak rain and with a pitch too great its stones will fall loose.

Most roof s have a pitch in the 4 12 to 9 12 range. For most home styles roof pitches fall in a range 4 12 a moderate slope up to 8 12 fairly steep. A 4 12 is a roof slope that rises by 4 inches for every 12 inches across. High and low pitch examples two examples at each end of the spectrum.

A pitch over 9 12 is considered a steep slope roof between 2 12 and 4 12 is considered a low slope roof and less than 2 12 is considered a flat roof. Display of roof pitches 1 12 through 18 12. The table below shows common roof pitches and the equivalent grade degrees and radians for each. Slope ratio a roof that rises 4 inches for every 1 foot or 12 inches of run is said to have a 4 in 12 slope.

Thatch is one of the oldest roofing materials and needs a steep pitch to drain properly some types of stone roofs have a very restrictive roof pitch.