Tpo Roof Minimum Slope

Tpo is a type of membrane roofing suitable for flat and low slope roofs.

Tpo roof minimum slope.

This 1 4 12 minimum roof slope requirement also applies to spray polyurethane foam spf roof systems in new construction. 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. This means that the rise of the slope goes up or down 8 inches for every 12 inches. You can read our article about calculating slope for information on the various roof slope notations.

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. 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. 1 16 12 in 12 maximum slope fully adhered system. An example for a steep sloped roof is 8 12.

Minimum pitch for metal roof. The roof system should be designed to prevent ponding of water on the roof surface. Ponding is defined as water that has not drained or dissipated within 48 hours after rainfall. Technically we are talking about low slope roofs that have a slope less than or equal to 3 12.

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. Asphalt shingles minimum roof slope roof pitch r905 2 2. With regards to metal roofing the profile refers to the shape adopted by the metal sheets when they are bent to form the panels. For metal panel roof systems with nonsoldered seams with applied lap sealant ibc 2018 prescribes a 1 2 12 minimum roof slope.

To put it in perspective the angle of this slope would be around 30 degrees. Maximum slope mechanically attached system. This means for every 12 horizontal units the roof must rise a minimum of 2 vertical units. 1 16 12 in 12.

To get the minimum pitch for a metal roof the vertical rise per foot is divided by the horizontal slope. For standing seam metal roof panel systems a 1 4 12 minimum roof slope is prescribed. The minimum roof slope for metal roofs is dependent upon the roof profile. Asphalt shingles can only be installed on roof slopes of 2 12 or greater.

The slope of a roof or pitch is determined by how many inches the roof rises over 1 foot or 12 inches. The following table provides the minimum required allowable roof slope for each type of roofing material mentioned in the code. The minimum roof slope allowed by code for any type of roof is in 12 applicable only to coal tar pitch roof systems.