Modified Bitumen Roof Minimum Slope
Modified bitumen roofing may have a granular surface as shown here or it may be smooth.
Modified bitumen roof minimum slope. 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 roofing was designed for use on buildings that have a low slope or flat roof. Modified bitumen membrane roofs must have a design roof slope of 1 4 12 or greater 2 slope. These steps show a torch down method which looks a bit scary but actually is not too difficult.
The following table provides the minimum required allowable roof slope for each type of roofing material mentioned in the code. One of the longer lasting roofing options for flat roofs is bitumen roofing or a modified bitumen roof. This 1 4 12 minimum roof slope requirement also applies to spray polyurethane foam spf roof. Limited warranty 5 year limited warranty.
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. Technically we are talking about low slope roofs that have a slope less than or equal to 3 12. Bitumen roof advantages and disadvantages. You can read our article about calculating slope for information on the various roof slope notations.
Renting a large propane torch is inexpensive. If you install the smooth product cover it with aluminum coating. Self adhered modified bitumen roof systems come with several advantages over tpo single ply roofing systems. Tamko modified bitumen roof system over wood decks miami dade county noa 17 0222 09 expiration date.
Modified bitumen roofing minimum roof slope roof pitch r905 11 1. 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. This means for every 12 horizontal units the roof must rise a minimum of one fourth vertical unit. 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.
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