Standard House Roof Pitch

This measurement is best done on a bare roof because curled up roofing shingles will impair your measurement.

Standard house roof pitch.

The terms are scientific in nature. Pitches above 9 12 are very highly angled and are designated steep slope roofs. Minimum roof pitch for shingles. 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.

Commonly it is 3 4 th of span as per gothic rafter must be equal to span. Citation needed carpenters frame rafters on an angle to pitch a roof. Pitches lower than 4 12 have a slight angle and they are defined as low slope roofs. Pitches of less than 2 12 are considered flat roofs even though they may be very slightly angled.

Usually average roof pitch is determined using the same roof length method. Today s standard ceiling height is nine feet. But since there is still a wide variety of slate roofing systems there are occasions when the minimum pitch can go down to as low as 15 0 depending on the uniqueness of the roof. The terms are slight different by which the roof pitches are symbolized.

For example when the roof is denoted by six and twelve that means a roof that rises six inches each twelve level inches. Greek says one must keep rafter length in range of 1 9 to 1 7 th of span but as per roman style the standard dimensions are kept about 1 3 to 2 9 th of span with an angle of 23 to 24 degree. Buffalo new york and montreal quebec canada specify 6 in 12 a pitch of approximately 26 6 degrees. 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.

Gable and other multi pitched roofs allow for lower primary structures with a corresponding reduction in framing and sheathing materials. The most commonly used roof pitches fall in a range between 4 12 and 9 12. The amount of vertical climb has for every twelve inches of lateral dimension by which roof pitches are represented.