Modified Bitumen Roof Minimum Slope

Bitumen roof advantages and disadvantages.

Modified bitumen roof minimum slope.

Modified bitumen roofing minimum roof slope roof pitch r905 11 1. Modified bitumen roofing was designed for use on buildings that have a low slope or flat roof. You can read our article about calculating slope for information on the various roof slope notations. One of the longer lasting roofing options for flat roofs is bitumen roofing or a modified bitumen roof.

Renting a large propane torch is inexpensive. Modified bitumen membrane roofs must have a design roof slope of 1 4 12 or greater 2 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. Modified bitumen roofing may have a granular surface as shown here or it may be smooth.

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. Self adhered modified bitumen roof systems come with several advantages over tpo single ply roofing systems. The following table provides the minimum required allowable roof slope for each type of roofing material mentioned in the code.

Tamko modified bitumen roof system over steel decks miami dade county noa. 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. 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.

Tamko modified bitumen roof system over wood decks miami dade county noa 17 0222 09 expiration date. 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. If you install the smooth product cover it with aluminum coating. The minimum roof slope allowed by code for any type of roof is in 12 applicable only to coal tar pitch roof systems.

This means for every 12 horizontal units the roof must rise a minimum of one fourth vertical unit.