Modified Roofing Paper

Roofing felt also called roofing felt paper is underlayed on roofs before shingles are added.

Modified roofing paper.

How to install torch down modified bitumen roofing. The type of substrate and the performance objectives influence the specification of the modified bitumen membrane system. The term cold applied is referring to o. 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. Stick roofing material that installed correctly should last many years. As with other types of modified bitumen materials. The torch down installation method and a peel and stick installation.

Modified bitumen roofing may have a granular surface as shown here or it may be smooth. Its main purpose is to prevent moisture from leaking into a roof. When it comes to estimating the weight of an existing roof field verification of the in place construction is necessary. The standard types of felt are 15 and the more waterproof 30.

These steps show a torch down method which looks a bit scary but actually is not too difficult. The numbers ihad a correlation to the weight not the thickness. 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. Developed in europe in the mid 1960s modified bitumen roofing has been used in canada and the united states since about 1975.

Today modified bitumen mb is king with cap membranes torched on to fuse them to fiberglass reinforced interplies or base coats. Cold process modified bitumen roll roofing is another way to apply rolled roofing other than hot mopping or torching. If you install the smooth product cover it with aluminum coating. Synthetic underlayment technically non bitumen synthetic underlayment is the preferred underlayment of most roofing professionals today.

Felt paper is applied across the entire roof deck. Burs consisted of alternative layers of heavy building paper and hot tar. At one time built up roofs burs once represented half of all flat roof coverings. 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.