Modified Roofing Paper

The standard types of felt are 15 and the more waterproof 30.

Modified roofing paper.

A built up roof for example will typically include the built up membrane itself with or without gravel as well as some kind of insulation and cover board which will vary in thickness from roof to roof. Modified bitumen roofing is also very rugged and can sustain a fair amount of foot traffic. Depending on local weather waterproof underlayment may be recommended. It was developed as a means to improve roofing membranes when product quality was affected by the use of a lower quality crude oil by product.

Self adhering modified bitumen roll roofing is designed for flat roofs with a pitch or 4 12 or less typically found over shed type garages and second floor porches. How to install torch down modified bitumen roofing. These steps show a torch down method which looks a bit scary but actually is not too difficult. Burs consisted of alternative layers of heavy building paper and hot tar.

Cold process modified bitumen roll roofing is another way to apply rolled roofing other than hot mopping or torching. Felt paper is applied across the entire roof deck. Its main purpose is to prevent moisture from leaking into a roof. If you install the smooth product cover it with aluminum coating.

There are two main forms of modified bitumen roofing installation. Modified bitumen roofing may have a granular surface as shown here or it may be smooth. The numbers ihad a correlation to the weight not the thickness. The torch down installation method and a peel and stick installation.

As with other types of modified bitumen materials. At one time built up roofs burs once represented half of all flat roof coverings. Synthetic underlayment technically non bitumen synthetic underlayment is the preferred underlayment of most roofing professionals today. Today modified bitumen mb is king with cap membranes torched on to fuse them to fiberglass reinforced interplies or base coats.

The finished roofing membrane may consist of one or more modified bitumen sheets or it may be comprised of a combination of built up roofing bur felts and one or more modified bitumen sheets. Developed in europe in the mid 1960s modified bitumen roofing has been used in canada and the united states since about 1975. Stick roofing material that installed correctly should last many years. When it comes to estimating the weight of an existing roof field verification of the in place construction is necessary.