1 12 Roof Slope

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.

1 12 roof slope.

Then you ll be able to measure slope from an unfinished attic space under the roof. High and low pitch examples two examples at each end of the spectrum. 1 12 roof pitch angle 4 76 degrees. 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.

The picture below shows the pitch of a 7 12 roof slope meaning that for 12 of horizontal measurement roof run the vertical measurement roof rise is 7. The table below shows common roof pitches and the equivalent grade degrees and radians for each. A 4 12 is a roof slope that rises by 4 inches for every 12 inches across. This measurement is best done on a bare roof because curled up roofing shingles will impair your measurement.

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. 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 means for every 12 horizontal units the roof must rise a minimum of 1 vertical unit. Using a tape measure make a pencil mark 12 inches from the end of a carpenter s level.

Display of roof pitches 1 12 through 18 12. Most roof s have a pitch in the 4 12 to 9 12 range. 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.

A 4 12 slope is enough to accommodate water runoff but is not suitable for regions that are. 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. 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. Examples of extreme slopes range from 1 4 12 almost flat to 12 12 sloping down at a perfect 45 degree angle.

For most home styles roof pitches fall in a range 4 12 a moderate slope up to 8 12 fairly steep.