How Thick Should A Modified Bitumen Roof Be

The expected lifespan of a modified bitumen roof often called a modified bit roof is 10 to 15 years in florida.

How thick should a modified bitumen roof be. The material is used for roofs with a low slope or nearly flat. Modified bitumen roofing was designed for use on buildings that have a low slope or flat roof. If the slope is greater than 4 12 which provides more water drainage from the roof use one layer of 15 felt. The combination of these layers makes the membrane over 3 8 thick.

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. The base sheet is often self adhered to the roofing substrate. Whatever the reason these time sensitive requests require contractors who can quickly provide a roof proposal and get to work. Maybe their roof suffered storm damage or they re selling their home or they ve found a leak that s damaging their ceiling.

Then a modified bitumen membrane embedded with ceramic granules is heat fused down to the base completing the 2 ply system. It is a roll roofing that is applied with liquid mastic and has a surface finish of small rock granules similar to a 3 tab shingle roof. If the slope is between 3 12 and 4 12 use two layers of 15 felt for asphalt shingles. Often when a homeowner calls you for a roof repair or replacement time is of the essence.

Modified bitumen roofs have a lot of advantages over other types of membrane roofing and are often seen as the modern alternative to the built up roof. A base sheet and a cap sheet. Modified bitumen roofing membranes 55 6 4 u l. There are two main types of modified bitumen sheets.

The mem brane is heat fused in place. Listed specifications single ply membrane systems unless otherwise specified the insulation and base sheet are mechanically fastened to the deck. Dibiten poly 4 5 modified bitumen. The cap sheet is either torched down cold adhered or self adhered modified bitumen can also be applied in hot asphalt.

A modified bitumen roof generally consists of two layers. Class a ballasted 1. This roof system can withstand heavy foot traffic by work crews snow shoveling and because it has embedded ceramic granules on the surface it will. The asphalt and rubber combination makes it durable and holds up to so much more than your standard roofing.

The advantages to a modified bitumen roof i have already told you that they have less maintenance and good lifespan but another great advantage is the strength.