1 12 Roof 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.

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. 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. 1 12 roof pitch angle 4 76 degrees. Examples of extreme slopes range from 1 4 12 almost flat to 12 12 sloping down at a perfect 45 degree angle.

If a roof rises 1 in a length of 12 this is 1 12 roof pitch. 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. 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. 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.

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. A 4 12 slope is enough to accommodate water runoff but is not suitable for regions that are. High and low pitch examples two examples at each end of the spectrum. Using a tape measure make a pencil mark 12 inches from the end of a carpenter s level.

This measurement is best done on a bare roof because curled up roofing shingles will impair your measurement. For most home styles roof pitches fall in a range 4 12 a moderate slope up to 8 12 fairly steep. Most roof s have a pitch in the 4 12 to 9 12 range. Then you ll be able to measure slope from an unfinished attic space under the roof.

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. Mineral surfaced roll roofing can only be installed on roof slopes of 1 12 or greater 8 slope. This means for every 12 horizontal units the roof must rise a minimum of 1 vertical unit. A 4 12 is a roof slope that rises by 4 inches for every 12 inches across.

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.