Modified Bitumen Roof Minimum Slope

Modified bitumen roofing was designed for use on buildings that have a low slope or flat roof.

Modified bitumen roof minimum slope.

Thermoplastic polyolefin tpo single ply roofing membranes are typically offered with 20 year warranties but manufacturers are now on their sixth formula iteration and have yet to effectively resolve cracking erosion and other. Liberty sbs self adhering base ply sheet is a self adhering roofing membrane designed to be used as either a base sheet or a ply sheet in your modified bitumen roofing system providing long lasting protection for low slope roofs. For example the international building code 2018 edition ibc 2018 prescribes a 1 4 12 minimum roof slope for asphalt built up polymer modified bitumen thermoset and thermoplastic single ply and liquid applied membranes in new construction. The following table provides the minimum required allowable roof slope for each type of roofing material mentioned in the code.

Modified bitumen roofing may have a granular surface as shown here or it may be smooth. You can read our article about calculating slope for information on the various roof slope notations. Tamko modified bitumen roof system over wood decks miami dade county noa 17 0222 09 expiration date. This means for every 12 horizontal units the roof must rise a minimum of one fourth vertical unit.

This 1 4 12 minimum roof slope requirement also applies to spray polyurethane foam spf roof. Self adhered modified bitumen roof systems come with several advantages over tpo single ply roofing systems. Modified bitumen is a type of asphalt product that can be applied in a number of ways to the roof in both hot and cold temperatures. Tamko modified bitumen roof system over steel decks miami dade county noa.

Renting a large propane torch is inexpensive. The minimum roof slope allowed by code for any type of roof is in 12 applicable only to coal tar pitch roof systems. Limited warranty 5 year limited warranty. 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.

Modified bitumen membrane roofs must have a design roof slope of 1 4 12 or greater 2 slope. Modified bitumen roofing minimum roof slope roof pitch r905 11 1. One of the longer lasting roofing options for flat roofs is bitumen roofing or a modified bitumen roof. Advantages there are a wide range of methods available for installing modified bitumen roofing from using a hot torch to using a sealant backed peel and stick rolls.

Technically we are talking about low slope roofs that have a slope less than or equal to 3 12.