30 Lb Or 15 Lb Felt For Flat Roof

The best weight for roofing felt is the 30 pound product because it provides thicker and.

30 lb or 15 lb felt for flat roof. In my opinion felt paper is a vapor barrier plus keeps the oils in the shingles from leaching out and into the wood substrate i e. One roofing square and 30 lb felt paper weighed 30 pounds per square. That s seldom if ever the case with a skylight. 15 lb felt paper weighed 15 pounds per 100 sq.

Historically roofing felt paper was named for weight. 30 pound roofing felt it is not paper it s made from either fiberglass or polyester that s been bound together with asphalt costs the same per roll as 15 pound felt but there are 216 square. At least one manufacturer uses it to describe huge glazed areas in a flat roof. Plywood or osb roof deck so 15 20 or 30 will work for any shingle roof the type i recommend depends on roof slope.

Generally speaking roofing felt is a felt paper that is soaked in asphalt and other water resistant compounds to produce a membrane. The numbers ihad a correlation to the weight not the thickness. 15 asphalt felt 3 x 144 roofing underlayment 432 sq. Ft at menards send cancel mail in rebate is in the form of merchandise credit check valid in store only.

Asphalt saturated heavy duty roofing felt is available in 15 and 30 pound weights. Its main purpose is to prevent moisture from leaking into a roof. The difference between 15 lb and 30 lb roofing felt paper. Also roof windows are generally big enough to qualify as means of egress in case of a fire.

The standard types of felt are 15 and the more waterproof 30. The term sky window is not as common as the others. Felt paper is commonly produced with a certain number of recycled products and coated with asphalt. In the old days common felt was 15 lb felt and 30 lb felt and a roll of the first held 4 squares and weighed 60 lbs while a roll of the second held 2 squares and weighed 60 lbs.

Roofing felt also called roofing felt paper is underlayed on roofs before shingles are added. What is roofing felt. Felt is commonly sold in either 15 or 30 rolls measuring 36 inches wide.