Pitched roofs begin with with slopes greater than 3 in 12.
Roof low pitch options.
2 where the roof is not visible consider upgrading to a single ply roofing intended for low slope roofs.
For commercial buildings one of the other popular low pitch roof options is coated metal.
A minimum pitch of 3 in 12 or even 4 in 12 will normally be required.
This top layer normally is tar over which the gravel is laid.
Pros cons of roll roofing bur modified bitumen epdm roof systems.
Think of them as taking the middle road in terms of roof pitch not too flat not too steep.
Built up roofing is the most popular roofing material used on low sloped roofs.
Table of low slope roofing options.
This coating helps reduce the instances of rust increasing the life span of the roof.
5 12 to 12 12 pitch.
Suitable materials for pitched roofs.
The following low slope roof system discussion is adapted paraphrased with permission from best practices guide to residential construction chapter on best roofing practices.
1 cover the entire surface with a self adhesive flashing membrane such as grace ice water shield there are many.
Metal roofs aren t waterproof in and of themselves but they can be treated with a coating that makes them so.
Keep in mind that neither metal shingles not corrugated metal panels are suitable options for low slope or nearly flat roofs.