Modified Roofing Paper

Depending on local weather waterproof underlayment may be recommended.

Modified roofing paper.

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. The numbers ihad a correlation to the weight not the thickness. Its main purpose is to prevent moisture from leaking into a roof. Modified bitumen roofing may have a granular surface as shown here or it may be smooth.

The term cold applied is referring to o. Cold process modified bitumen roll roofing is another way to apply rolled roofing other than hot mopping or torching. When it comes to estimating the weight of an existing roof field verification of the in place construction is necessary. 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.

Felt paper is applied across the entire roof deck. Stick roofing material that installed correctly should last many years. 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. These steps show a torch down method which looks a bit scary but actually is not too difficult.

Synthetic underlayment technically non bitumen synthetic underlayment is the preferred underlayment of most roofing professionals today. The type of substrate and the performance objectives influence the specification of the modified bitumen membrane system. There are two main forms of modified bitumen roofing installation. Burs consisted of alternative layers of heavy building paper and hot tar.

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. As with other types of modified bitumen materials. Today modified bitumen mb is king with cap membranes torched on to fuse them to fiberglass reinforced interplies or base coats. Roofing felt also called roofing felt paper is underlayed on roofs before shingles are added.

How to install torch down modified bitumen roofing. If you install the smooth product cover it with aluminum coating. The standard types of felt are 15 and the more waterproof 30. At one time built up roofs burs once represented half of all flat roof coverings.