The minimum pitch for a roof is 1 4 12 which translates to 1 4 inch rise to 12 inches of run.
Minimum roof slope bc.
The short simple answer is 2 12 has traditionally been considered the absolute minimum acceptable roof slope suitable for asphalt shingles.
British columbia building code 2018 division b 9 26 2 4.
However below 4 12 a superior underlay is required.
The minimum slope for standing seam of roof systems shall be one quarter unit vertical in 12 units horizontal 2 percent slope.
They provide excellent weather resistance great value and now more than ever a tremendous range of beautiful designs and color blends.
Steep pitch it is difficult to safely walk on a roof when the slope is steeper than 7 12.
With regards to metal roofing the profile refers to the shape adopted by the metal sheets when they are bent to form the panels.
There are fewer options when the roof slope approaches 2 12.
Roof slope to a point equal in height to the flashing on the masonry but not less than 1 5 times the shingle exposure.
Depending on the roof profile there are minimum roof slope requirements for each panel which need to be considered.
The values given here.
1 see sentence 9 26 3 1 2.
Type of roofing minimum slope maximum slope asphalt shingles low slope application 1 in 6 no limit.
Asphalt shingles continue to be the most widely installed roof covering option in north america.
2 asphalt and gravel or coal tar and gravel roofs may be constructed with lower slopes than required in sentence 1 when effective drainage is provided by roof drains located at the lowest points on the roofs.
The following table provides the minimum required allowable roof slope for each type of roofing material mentioned in the code.
Cedar is available down to 4 12 for shakes and 3 12 for shingles.
Minimum pitch for metal roof.
Asphalt shingles can be applied as low as 2 12.
To get the minimum pitch for a metal roof the vertical rise per foot is divided by the horizontal slope.
The profile refers to the shape the metal sheets take when they bend to.
The code provides minimum slopes for various types of roofing in table 9 27 3 a.
The minimum roof slope for metal roofs is dependent upon the roof profile.
Notes to table 9 26 3 1.
3 profiled metal roof cladding systems specifically designed for low slope applications are.
However you can only use this pitch with built up roofing or specialized synthetic roofing.
2 see sentence 9 26 3 1 3.
