Tpo Roof Minimum Slope

For metal panel roof systems with nonsoldered seams with applied lap sealant ibc 2018 prescribes a 1 2 12 minimum roof slope.

Tpo roof minimum slope.

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. 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 slope of a roof or pitch is determined by how many inches the roof rises over 1 foot or 12 inches. 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.

An example for a steep sloped roof is 8 12. Maximum slope mechanically attached system. To put it in perspective the angle of this slope would be around 30 degrees. This is the minimum pitch or slope a roofing deck can be in order to install composition roofing shingles on it.

The minimum roof slope for metal roofs is dependent upon the roof profile. Technically we are talking about low slope roofs that have a slope less than or equal to 3 12. Tpo rubber roof between house and garage breezeway. 1 16 12 in 12 maximum slope fully adhered system.

The roof system should be designed to prevent ponding of water on the roof surface. 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. You can read our article about calculating slope for information on the various roof slope notations. The minimum roof slope allowed by code for any type of roof is in 12 applicable only to coal tar pitch roof systems.

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. The following table provides the minimum required allowable roof slope for each type of roofing material mentioned in the code. 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. To get the minimum pitch for a metal roof the vertical rise per foot is divided by the horizontal slope.

Asphalt shingles minimum roof slope roof pitch r905 2 2. Ponding is defined as water that has not drained or dissipated within 48 hours after rainfall. 1 16 12 in 12. This means that the rise of the slope goes up or down 8 inches for every 12 inches.

This means for every 12 horizontal units the roof must rise a minimum of 2 vertical units. Minimum pitch for metal roof. For standing seam metal roof panel systems a 1 4 12 minimum roof slope is prescribed.