Slope Pitch Of Roof

The rafters equal the span.

Slope pitch of roof. The 30 degree 7 12 roof recommendation is backed up by testing according to the publication science daily. These types of roofs anything under 3 12 have increasingly shown jacksonville homeowners issues. A 30 degree roof slope 7 12 pitch is the right pitch to aerodynamically handle high wind. It determines how many inches the roof should rise for every 12 inches expanding on the horizontal side.

The ridge height is 1 9 to 1 7th the span an angle of 12 5 to 16. A roof that rises 4 inches for every 1 foot or 12 inches of run is said to have a 4 in 12 slope. Understanding your roof s pitch and slope low slope. The slope ratio represents a certain amount of vertical rise for every 12 inches of horizontal run.

Some people prefer high pitches and some other choose low roof pitches each has their own advantages and disadvantages. Lower slopes don t handle wind driven rain as well. Commonly used roof pitches were given names such as greek. Take the measurement of the vertical.

Before taking any measurements you must first confirm that it s safe to walk on your roof. The rafter length is 3 4 the span about 48. While the cost of the materials and labor to reroof a steep slope roof is more expensive the longevity is. The ridge height is 2 9ths to 1 3 the span an angle of 24 to 34.

Position your level against the roof until the bubble of the vial sits between two lines. 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. Steeper slopes increase the sail effect that makes them susceptible to wind.