Standard Roof Pitch Michigan

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.

Standard roof pitch michigan.

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. I e 4 inches of rise per 12 inches one foot of run. Using roof pitch to order materials. Most roof s have a pitch in the 4 12 to 9 12 range.

The pitch of a roof is its vertical rise over its horizontal span. This is the slope of geometry stairways and other construction disciplines or the trigonometric arctangent function of its decimal. Roof slopes are most commonly defined by the rise over run ratio. The table below shows common roof pitches and the equivalent grade degrees and radians for each.

Some of the most common roof pitch types are conventional slope type roofs designed with pitch ranging from 4 12 to 9 12. The minimum pitch for a roof is 1 4 12 which translates to 1 4 inch rise to 12 inches of run. Roof covering section maximum ultimate design wind speed v ult 140 mph maximum ultimate design wind speed v ult 140 mph. 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.

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. However you can only use this pitch with built up roofing or specialized synthetic roofing. 0 pitch 1 00x the roof area. Roof pitches exceeding the level of 9 12 or approximately 37 degrees are termed steep slope roofs.

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. To do that requires basic geometry but fret not you can just refer to tables that are standard in the industry. This measurement is best done on a bare roof because curled up roofing shingles will impair your measurement. Roof pitch is a measurement of a roof s slope expressed as a ratio.

Since this is a flat roof or nearly flat roof. 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. These are utilized in residential applications. Multipliers used for estimating roof area based on slope.

You can go by the measurements taken by walking the roof.