Standard House Roof Pitch

Gable and other multi pitched roofs allow for lower primary structures with a corresponding reduction in framing and sheathing materials.

Standard house roof pitch. The table below shows common roof pitches and the equivalent grade degrees and radians for each. 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. 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 amount of vertical climb has for every twelve inches of lateral dimension by which roof pitches are represented.

Pitches of less than 2 12 are considered flat roofs even though they may be very slightly angled. 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. Buffalo new york and montreal quebec canada specify 6 in 12 a pitch of approximately 26 6 degrees. Pitches lower than 4 12 have a slight angle and they are defined as low slope roofs.

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

For example when the roof is denoted by six and twelve that means a roof that rises six inches each twelve level inches. Pitches above 9 12 are very highly angled and are designated steep slope roofs. Minimum roof pitch for shingles. The most commonly used roof pitches fall in a range between 4 12 and 9 12.

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. With regards to the pitch the building standard code bs 5534 recommends a minimum pitch of 200 for slate roofs.