Is 30 Pound Felt Better Than 15 Pound For Roof

No 15 felt and no.

Is 30 pound felt better than 15 pound for roof. The type i recommend depends on roof slope. Because it s thicker and stronger 30 pound felt is a better choice than 15 pound felt for roofing. We use the 30 felt paper because i feel it is the best product for your roof. For slopes less than 4 12 i recommend 2 layers of 15.

It comes in two thicknesses. Felt roofing underlayment is typically available in two types. 30 roofing felt is far better than unrated 30 pound felt which may weigh as little as 15 20 pounds. Synthetic underlayment for durability and enhanced water resistance some roofers are going with.

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. The best weight for roofing felt is the 30 pound product because it provides thicker and stronger footing for. However to lower production costs manufacturers began lowering the weight. Today the number 15 asphalt felt type 1 weighs between seven and fourteen pounds per 100 square feet.

15 is easy to rip underfoot when installing the new roof system and ripped felt paper is useless regardless of weight. It is thicker and heavier than the alternative 15 so if water ever gets under your shingles it has to work extra hard to get through the felt. The debate is about moisture protection felt or tar paper asphalt impregnated coarse fiber paper is quite impervious to moisture for a short term exposure during a rainstorm say though it does soak up moisture if kept wet for more than a few hours as occurs during ice damming does tend to bunch and creep and wrinkle when wet and does start getting brittle and cracked after about 10. Plywood or osb roof deck so 15 20 or 30 will work for any shingle roof.

The number 30 felt type 2 weighs 16 5 or 17 pounds. In the beginning 15 pound asphalt felt weighed 15 pounds per 100 square feet. Asphalt saturated heavy duty roofing felt is available in 15 and 30 pound weights. Felt will wear out over time but you will simply never have a problem if you install 30 pound roofing felt on the deck because the 30 pound roofing felt will last longer than your roof materials.

Roofing asphalt saturated felt is a blend of cellulose polyester bitumen and asphalt soaked in a waterproofing agent. We always recommend going with 30 pound roofing felt. Thirty pound felt is more thick and stiff than fifteen pound so thirty pound is more resistant to damage during installation. Two layers of astm 30 pound asphalt impregnated felt is the minimum you should use under tile and should last 20 to 30 years.

The main advantage of using felt roofing underlayment is cost.