The minimum roof slope allowed by code for any type of roof is in 12 applicable only to coal tar pitch roof systems.
Minimum roof slope for metal shingles.
For low slope metal roofs under 12 that are nearly flat modified bitumen roofing thermoset and.
The minimum pitch for metal roof shingles and lapped non soldered panels is 3 12.
The following table provides the minimum required allowable roof slope for each type of roofing material mentioned in the code.
Metal roof shingles require a minimum roof pitch of 3 12 or greater.
Asphalt shingles require a minimum roof pitch of 2 12 or greater.
Clay and concrete tile requires a minimum roof pitch of 2 1 2 12 or greater.
The minimum pitch for a standing seam metal roof is 1 4 or 3 inches rise to 12 inches run.
To get the minimum pitch for a metal roof the vertical rise per foot is divided by the horizontal slope.
The minimum slope for lapped non soldered seam metal roofs without applied lap sealant shall be three units vertical in 12 units horizontal 25 percent slope.
Minimum metal roof slope depends on the roof profile building design climate and site location.
Panels joined with an applied lap sealant can go as low as 12.
Low slope roofs are not totally flat their roof slope generally ranges from 1 4 12 to 3 12.
Typically large footprint single story.
They provide excellent weather resistance great value and now more than ever a tremendous range of beautiful designs and color blends.
After that the miimum pitch for metal panels depending on the methods used to join the panels.
There are some opinions that standing seam metal roof minimum slope is 12 but it increases the possibility of leaking on the few first days of snow arrival.
The minimum pitch for shingles is 1 6 which is equivalent to 4 inches rise to 24 inches run.
According to the 2012 international building code 1507 4 2 deck slope minimum slopes for roof panels need to comply with the following.
Asphalt shingles continue to be the most widely installed roof covering option in north america.
The short simple answer is 2 12 has traditionally been considered the absolute minimum acceptable roof slope suitable for asphalt shingles.
In country with heavy snow and tough winter days the metal roof minimum slope is recommended to be 1 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.
Let us recap on the minimum roof pitch required for each type of roofing material.