Modified Roofing Paper

Depending on local weather waterproof underlayment may be recommended.

Modified roofing paper.

At one time built up roofs burs once represented half of all flat roof coverings. As with other types of modified bitumen materials. Stick roofing material that installed correctly should last many years. The type of substrate and the performance objectives influence the specification of the modified bitumen membrane system.

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. The standard types of felt are 15 and the more waterproof 30. The term cold applied is referring to o. If you install the smooth product cover it with aluminum coating.

How to install torch down modified bitumen roofing. Developed in europe in the mid 1960s modified bitumen roofing has been used in canada and the united states since about 1975. Cold process modified bitumen roll roofing is another way to apply rolled roofing other than hot mopping or torching. 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.

Modified bitumen roofing may have a granular surface as shown here or it may be smooth. 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. There are two main forms of modified bitumen roofing installation. Roofing felt also called roofing felt paper is underlayed on roofs before shingles are added.

The torch down installation method and a peel and stick installation. The numbers ihad a correlation to the weight not the thickness. Burs consisted of alternative layers of heavy building paper and hot tar. Synthetic underlayment technically non bitumen synthetic underlayment is the preferred underlayment of most roofing professionals today.

Its main purpose is to prevent moisture from leaking into a roof. These steps show a torch down method which looks a bit scary but actually is not too difficult. 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. Felt paper is applied across the entire roof deck.