What is #15 tar paper?
The most common product is #15 felt. Before the oil crisis, felt weighed about 15 pounds per square (one square = 100 square feet), hence the asphalt-impregnated felt was called “15#” and “15-pound felt”. Modern, inorganic mats no longer weigh 0.73 kg/m2, and to reflect this fact, the new felts are called “#15”.
What is the difference between 15lb and 30 lb tar paper?
While #15 is a good option for most roofing jobs, #30 provides more protection and performance for steep roofs and flat roofs. But if your roof has a steep pitch, #30 is a better option because it is thicker and tears less during installation. With #30 you get a thicker layer of underlayment and protection.
What is the heaviest tar paper?
Tar paper is a heavy-duty asphalt-based paper that is water resistant and comes in multiple levels of thickness (15 pound being the thinnest/minimum requirement and 30 pound being the thickest/maximum for a standard roofing application).
Is tar paper better than Tyvek?
Tyvek offers more permeability but less longevity, and you find it near the exterior siding. Tar paper withstands high moisture levels, but it can crack in freezing temperatures. That’s why you usually find it on the interior walls.
How many square feet does 15 lb felt cover?
Roll Self-Adhered Roofing Underlayment (225 sq. ft.)
What is #15 felt used for?
#15 Specification Felt is a specification grade felt roofing underlayment used between the roof deck and the shingles.
Is tar paper necessary under shingles?
Answer: Roofing felt is a layer of tar paper installed beneath the shingles to provide a backup waterproof membrane in case of leakage. But don’t let the lack of underpayment become a major issue for you, because it is simply not required for a second layer of composition shingles.
Is 15 pound felt waterproof?
Is Roofing Felt Waterproof? Roofing Felt is the support material that is required to develop roll roofing and roof shingles. Being used as the waterproof coverings in commercial as well as residential roofs for decades, these membranes comprise two layers, signifying it is waterproof.
Can tar paper be used as house wrap?
The old standby, often called “tar paper,” allows drying with a perm rating of of approximately 5 (more when wet) and blocks water effectively on a vertical wall, making it an effective sheathing wrap .
How much does a roll of 15 felt weigh?
By shifting the pound symbol, 15# felt became #15 felt, which may actually weigh 7.5 to 12.5 pounds per square; #30 felt can weigh between 16 and 27 pounds per square.