Standard Roof Pitch Michigan

This is the slope of geometry stairways and other construction disciplines or the trigonometric arctangent function of its decimal.

Standard roof pitch michigan.

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. However most often a ratio of pitch also fraction is slang used for the more useful slope of rise over run of just one side half the span of a dual pitched roof. I e 4 inches of rise per 12 inches one foot of run. Roof covering section maximum ultimate design wind speed v ult 140 mph maximum ultimate design wind speed v ult 140 mph.

Multipliers used for estimating roof area based on slope. 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. The pitch of a roof is its vertical rise over its horizontal span. Roof pitches exceeding the level of 9 12 or approximately 37 degrees are termed steep slope roofs.

Using roof pitch to order materials. The minimum pitch for a roof is 1 4 12 which translates to 1 4 inch rise to 12 inches of run. 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. These are utilized in residential applications.

However you can only use this pitch with built up roofing or specialized synthetic roofing. To do that requires basic geometry but fret not you can just refer to tables that are standard in the industry. If a roof slope rises say 4 inches when measured 12 inches along the bottom of a horizontal roof truss the roof slope is said to be 4 12. The table below shows common roof pitches and the equivalent grade degrees and radians for each.

0 pitch 1 00x the roof area. Table r905 1 1 2 underlayment application. Some of the most common roof pitch types are conventional slope type roofs designed with pitch ranging from 4 12 to 9 12. Roof pitch is a measurement of a roof s slope expressed as a ratio.

Roof slopes are most commonly defined by the rise over run ratio. Since this is a flat roof or nearly flat roof. Most roof s have a pitch in the 4 12 to 9 12 range. This measurement is best done on a bare roof because curled up roofing shingles will impair your measurement.

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.