There are also two different sizes of roof felt: #15 and #30, the main difference between the two being strength. … The longer your roof is exposed to the weather during its reconstruction and the more time it takes to finish the roof, then you should consider #30 roofing felt as opposed to the not as durable #15.
Should I use 15 or 30 pound felt?
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 type of roof felt is best?
We recommend polyester reinforced felt that has been manufactured specifically for heavy-duty use. It is thicker than standard grade shed felt, and like other reinforced products, it has a lifespan of approximately 15 years. The thickness of the product makes it more resistant to tearing when battered by heavy winds.
What are the different grades of roofing felt?
There are three types of roofing felt to consider for a roofing project; torch-on felt, self-adhesive felt and shed felt.
What does 30lb felt mean?
In the past, the felt number designation was correlated to the weight of the felt (i.e., a 15# felt weighed 15 pounds/100 square feet). … 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.
When should I use 30lb felt?
The best weight for roofing felt is the 30-pound product, because it provides thicker and stronger footing for roofers that does not tear out, especially on steep roofs where footing is critical.
What is #15 felt used for?
#15 Specification Felt is a specification grade felt roofing underlayment used between the roof deck and the shingles.
What is the thickest roofing felt?
Roofing Paper Thickness
The most commonly used felts are #15 and #30, with weights of 8 and 20 pounds per 100 square feet, respectively. The most commonly used is #15, which comes in rolls 3 feet wide, is 144-feet long and covers approximately four squares per roll, or approximately 400 feet of roof.
What is the best felt for flat roof?
Quite possibly the best flat roofing membrane, EPDM is a relatively low-cost flat roof material that offers a number of significant advantages. Clean, straightforward installation, incredible strength, a long lifespan, and a smart finish combine to make EPDM membranes a difficult one to beat.
How long will roofing felt last?
In most cases, traditional felt underlayment is rated to last between 12 and 20 years. In other words, in a little over a decade, the underlayment beneath your roof’s surface may start to deteriorate. The roof will become more prone to leaks as this added layer of protection breaks down.
Is torch-on felt any good?
Roofing felt may not always have had a reputation for being durable, but modern torch-on roof felt is remarkably strong and, crucially, resistant to UV rays and heat. … Once installed and set, the felt is hard and very strongly bonded to the surface of your roof, making it resistant to things like strong wind.
Do you need underlay for torch-on felt?
The torch-on felt solution relies on a three-layer system, which will require two levels of underlay underneath the cap sheet.
How many layers of felt do I need for a shed roof?
Felt layers. 1,2 or 3 layers are usual. Habitable work should use 3 layers, sheds more often use 2, sometimes 1. Underlay and top capsheet layers aren’t identical.
What is 15lbs felt?
Some customers prefer 30-lb felt paper because it is a thicker product, less likely to tear, and should wear better over time. In addition, on steeper roof slopes 30-lb felt paper is necessary for the slip protection of the installer, and it is also less likely to tear during installation of the shingles.
What is 15lb roofing felt?
Roofing felt is similar to fleece made from polyester or fiberglass and then soaked in waterproofing agent. 15 pound and 30 pound refers to the thickness of the felt, with the numbers indicating the weight of 100 square feet of this paper back when they were originally developed.
How many rolls of felt make a square?
Rolls of felt coverage for roofs is sold in rolls that are one square each. One roofing square equals to 100 square feet. Always double check with the roofing calculator to make sure that you have enough felt to cover the entire area of the roof.