30 Roofing Felt Is It Enough

Roofing felt s thickness is actually measured in pounds per square with one square equaling 100 feet of roofing material.

30 roofing felt is it enough.

30 specification felt roof underlayment 30 specification felt astm d4869 type iv astm d226 type ii atlas provides a complete selection of roofing felts or roofing paper. However not all types of roof are compatible with synthetic felt and in that case most will suggest that you opt for 30 pound felt if you can afford it. The material is less likely to tear and also creates a much safer working environment for the builders unlike 15. The only difference between the two are the strength.

The most commonly used felts are 15 and 30 with weights of 8 and 20 pounds per 100 square feet respectively. Felt roofing underlayment is asphalt saturated and are manufactured with a high grade organic mat. Builders argue its not a problem. 15 pound felt does provide enough protection in most cases but the others do a better job.

30 specification felt roofing underlayment is a specification grade felt for use as an underlayment between the. 15 roofing felt is more likely to tear as it is not as durable as its 30 counterpart especially with workers treading across your roof during the installation process in heavy work boots. Felt roofing paper is quite thick saturated with asphalt and it s water resistant not waterproof. Of course the 30 lb is considered the better choice for climates like ours in the pacific northwest but it is not necessary in other climates.

I italicized atop because on very low slope roofs some shingle installation applications specify interlaying a course of felt underlayment perhaps using 30 felt between every shingle course as part of making a shingled roof on a low slope a successful installation. 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. Roofing felt installation details omitted felt felt specifications for various roof pitches or slopes reader questions on roofing felt installation specifics june 28 2014 anonymous said. 30 roof felt is stronger which for your home means a lengthier lifespan throughout the arduous and often times abusive building process.

1 we often see roof felt stopped short of the eaves. Most roofing contractors prefer to use synthetic felt due to its various advantages in terms of strength weight safety and cost. 30 is stronger meaning that throughout the roof building process. In any case roofing felt alone is can not make a roof waterproof.

Felt underlayment comes in 15 and 30 lb options. 09 22 06 at 07 16 pm. Roofing felt s thickness is not a measurement of its depth because it is thin similar to heavy paper. There are two different types of roofing felt 15 and 30.