The minimum roof slope allowed by code for any type of roof is in 12 applicable only to coal tar pitch roof systems.
Tpo roof minimum slope.
Tpo rubber roof between house and garage breezeway.
Tpo performance that s proven to stand the test of time a recent study of everguard tpo roofs installed between 8 and 16 years ago found they all performed above astm standards.
The minimum slope for a flat roof is 1 4 per foot or 1 4 12 but some owners or insurance companies require a minimum slope of 1 2 per foot.
Technically we are talking about low slope roofs that have a slope less than or equal to 3 12.
Tpo s long term heat uv and natural fungal resistance plus flexibility without need for plasticizers also make tpo a reliable low slope roofing system.
For standing seam metal roof panel systems a 1 4 12 minimum roof slope is prescribed.
Tpo is a type of membrane roofing suitable for flat and low slope roofs.
This means that the rise of the slope goes up or down 8 inches for every 12 inches.
For metal panel roof systems with nonsoldered seams with applied lap sealant ibc 2018 prescribes a 1 2 12 minimum roof slope.
This means for every 12 horizontal units the roof must rise a minimum of 2 vertical units.
Roofing calculator in the building trades the acronym tpo stands for thermoplastic polyolefin a material originally developed for pond liners and used extensively for roofing since 1989.
Asphalt shingles minimum roof slope roof pitch r905 2 2.
This means the roof needs to have a slope going down to drain water off it of at least 3 per foot for every 12.
An example for a steep sloped roof is 8 12.
Minimum pitch for metal roof.
1 16 12 in 12.
Asphalt shingles can only be installed on roof slopes of 2 12 or greater.
This is the minimum pitch or slope a roofing deck can be in order to install composition roofing shingles on it.
The following table provides the minimum required allowable roof slope for each type of roofing material mentioned in the code.
With regards to metal roofing the profile refers to the shape adopted by the metal sheets when they are bent to form the panels.
The roof system should be designed to prevent ponding of water on the roof surface.
To put it in perspective the angle of this slope would be around 30 degrees.
The slope of a roof or pitch is determined by how many inches the roof rises over 1 foot or 12 inches.
1 16 12 in 12 maximum slope fully adhered system.
You can read our article about calculating slope for information on the various roof slope notations.
Maximum slope mechanically attached system.
Ponding is defined as water that has not drained or dissipated within 48 hours after rainfall.
