Minimum Angle Of Roof Pitch

Importance of a roof pitch.

Minimum angle of roof pitch.

Roof pitch refers to the measurement of the slope of a roof and you express this as a ratio. However with modern roofing materials such as boral roofing tiles the minimum roof pitch can be as low as 15. It is uncommon to find a roof below 15 but for those very low pitch applications there are interlocking clay pantiles available suitable for use down to 12 5. Normally 1 80 0 72 is the recommended minimum angle for a slope and this is universal across the vast majority of flat roofing systems regardless of the materials that they incorporate.

In order to achieve this drop a slightly steeper angle of 1 40 1 44 should be the aim when installing a flat roof as this accounts for surface deviations and material deflection among other things. Asphalt shingles continue to be the most widely installed roof covering option in north america. The pitch is the steepness of a roof the angle of a roof s slope. This measurement is best done on a bare roof because curled up roofing shingles will impair your measurement.

The minimum pitch for a roof is 1 4 12 which translates to 1 4 inch rise to 12 inches of run. Minimum roof pitch is the lowest angle at which a roof can be designed so the roof covering remains watertight. The minimum roof pitch is also subject to the standards set forth by the various building codes used in the respective regions. The chief reason for having a roof pitch is to redirect water and snow away from the roof and avoid any percolation that might result from stagnation of water on the roof.

The minimum requirement is 2 12. Shingles of all types need to have a slope to function properly. Although there s isn t any standard pitch of a roof used on all kinds of sloped roofs you can determine the range of pitches by using a roof angle calculator and by considering factors like the local climate and roofing materials. What does minimum roof pitch mean.

They provide excellent weather resistance great value and now more than ever a tremendous range of beautiful designs and color blends. Although the minimum roof pitch for residential homes may vary depending on city and state building codes. 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. What is the minimum pitch slope of an asphalt shingle roof.

That works out to about nine degrees if that works better for you. The short simple answer is 2 12 has traditionally been considered the absolute minimum acceptable roof slope suitable for asphalt shingles.