Roof Pitch In Michigan

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.

Roof pitch in michigan.

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 minimum pitch for a roof is 1 4 12 which translates to 1 4 inch rise to 12 inches of run. Roof pitch is a measurement of a roof s slope expressed as a ratio. 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.

Importance of a roof pitch. However you can only use this pitch with built up roofing or specialized synthetic roofing. This measurement is best done on a bare roof because curled up roofing shingles will impair your measurement. How roof pitch determines suitable roofing systems.

For that reason flat roofs are limited to these types of covering materials. 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. Roof pitch is used to describe the slope or angle of the roof. The roof pitch is important in determining the appropriate installation method and how much roofing material will be needed.

Roof pitch or slope is a measure of vertical rise to horizontal run expressed in inches per foot. However roof pitch is technically measured and defined differently and will not be discussed here. 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. 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.

Note that roof pitch is sometimes used in parallel with roof slope.