Standard House Roof Pitch

Pitches of less than 2 12 are considered flat roofs even though they may be very slightly angled.

Standard house roof pitch.

The most commonly used roof pitches fall in a range between 4 12 and 9 12. Minimum roof pitch for shingles. 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. The table below shows common roof pitches and the equivalent grade degrees and radians for each.

Usually average roof pitch is determined using the same roof length method. Buffalo new york and montreal quebec canada specify 6 in 12 a pitch of approximately 26 6 degrees. For example when the roof is denoted by six and twelve that means a roof that rises six inches each twelve level inches. With regards to the pitch the building standard code bs 5534 recommends a minimum pitch of 200 for slate roofs.

Today s standard ceiling height is nine feet. The terms are slight different by which the roof pitches are symbolized. The terms are scientific in nature. This measurement is best done on a bare roof because curled up roofing shingles will impair your measurement.

The amount of vertical climb has for every twelve inches of lateral dimension by which roof pitches are represented. Pitches lower than 4 12 have a slight angle and they are defined as low slope roofs. Citation needed carpenters frame rafters on an angle to pitch a roof. Commonly it is 3 4 th of span as per gothic rafter must be equal to span.

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. Newer houses are often built with nine foot ceilings on the first floor and sometimes eight foot ceilings on the second story. Pitches above 9 12 are very highly angled and are designated steep slope roofs.