Roof Pitch In Michigan

You can measure the roof slope on the bottom side of the roof deck at an easily accessible point such as the rake using a tape measure and simple geometry.

Roof pitch in michigan.

The roof pitch is important in determining the appropriate installation method and how much roofing material will be needed. How roof pitch determines suitable roofing systems. Importance of a roof pitch. Roof slope multipliers for roof components of sloping roofs multiply by the figures given below to obtain the cost per square foot of horizontal projection.

This measurement is best done on a bare roof because curled up roofing shingles will impair your measurement. However roof pitch is technically measured and defined differently and will not be discussed here. Roof pitch or slope is a measure of vertical rise to horizontal run expressed in inches per foot. The minimum pitch for a roof is 1 4 12 which translates to 1 4 inch rise to 12 inches of run.

For that reason flat roofs are limited to these types of covering materials. Rise multiplier rise multiplier 1 to 12 1 01 6 to 12 1 12 2 to 12 1 01 8 to 12 1 20 3 to 12 1 03 12 to 12 1 42 4 to 12 1 06 15 to 12 1 60 5 to 12 1 08 18 to 12 1 80. Roof pitch is used to describe the slope or angle of the roof. Fasteners for asphalt shingles shall be galvanized steel stainless steel aluminum or copper roofing nails minimum 12 gage 0 105 inch 3 mm shank with a minimum 3 8 inch diameter 9 5 mm head complying with astm f1667 of a length to penetrate through the roofing materials and not less than 3 4 inch 19 1 mm into the roof sheathing.

Although there is no single standard roof pitch used on all sloped roofs factors such as roofing materials and local climate help to determine the appropriate range of pitches for a given building. The chief reason for having a roof pitch is to redirect water and snow away from the roof and avoid any percolation that might result from stagnation of water on the roof. 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. Note that roof pitch is sometimes used in parallel with roof slope.

Flat and nearly flat roofs a pitch of 1 in 12 or 2 in 12 cannot be covered with shingles or shakes of any material since there is not enough angle to combat the danger of blow off.