1 12 Roof Slope

This measurement is best done on a bare roof because curled up roofing shingles will impair your measurement.

1 12 roof slope.

With insufficient pitch a roof can leak rain and with a pitch too great its stones will fall loose. The table below shows common roof pitches and the equivalent grade degrees and radians for each. 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.

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. 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. 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.

For most home styles roof pitches fall in a range 4 12 a moderate slope up to 8 12 fairly steep. 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. Mineral surfaced roll roofing can only be installed on roof slopes of 1 12 or greater 8 slope. 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. 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. 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 pitch angle 4 76 degrees.

Most roof s have a pitch in the 4 12 to 9 12 range. If a roof rises 1 in a length of 12 this is 1 12 roof pitch. High and low pitch examples two examples at each end of the spectrum. 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.