Asphalt Paper That Goes Under Roof Shingles

An underlayment performs two primary functions.

Asphalt paper that goes under roof shingles.

Installing an underlayment helps to minimize picture framing i e. It was easy to use durable and even had alignment lines to help with the shingle installation. A few people are still using that but most professionals are now using synthetic underlayments like dupont s protec which are basically woven polymer sheets with coatings to allow for traction on a pitched roof. Used to be roofing felt.

Asphalt saturated felt was the go to roofing underlayment until about 15 years ago. An underlayment should be used beneath asphalt shingles especially on roofs with a slope less than 8 12. The 15 pound was for lighter weight projects while the 30 offered more heavy duty protection. For many years roofers used asphalt saturated felt under roofing shingles and it was historically available in two standard weights.

Ridge vents are at the top of your roof covered by roofing material but with a gap designed to allow warm moist air to escape from the attic. It also helps to protect the wood of the roof and helps the top layer such as shingles tile or metal to adhere to the roof. Felt paper also referred to as tar paper was the standard underlayment material in roofing for decades. That s when synthetic products started gaining in popularity.

You need an underlayment can be 15 or 30 pound felt tarpaper does not actually weigh that much now but still called that some areas require one or the other by code i used to recommend 30 in the old days but now recommend 15 under the thinner shingles made today because thicker felt can bunch up and wrinkle causing visual irregularities in the shingles. The five main types of roofing materials are asphalt shingles cedar shakes concrete or ceramic tiles metal sheets and rubber used for flat roofs. It provides temporary weather protection until the asphalt shingles are installed and it provides a secondary weatherproofing barrier if moisture infiltrates the. 15 pounds per hundred square feet and 30 pounds per hundred square feet.

The underlayment is a layer of paper that helps keep the seams of the roof from leaking. Underlayment or felt paper as it is frequently called is installed over the roof deck before the application of asphalt shingles. Commonly referred to as felt paper or tar paper common roofing felt is made of varying blends of cellulose natural plant fibers polyester bitumen or asphalt. The visible outline of deck panels caused by irregularities in roof decking thickness.