ASTM D226 0.4mm Felt Paper Synthetic Underlayment Roofing

Felt Paper Underlayment Asphalt Shingles Underlayment

Introduction

As an integral part of any roofing system, underlayment provides another waterproof layer of protection from the elements. Installed on top of the decking , but under the shingles, underlayment is in place to keep any water that gets past the shingles away from the decking. It also acts as a weather barrier untile the shingles can be installed.

Felt paper, also referred to as tar paper, was the standard underlayment material in roofing for decades. It is made by kraft raw paper impreganated with high quality liquid asphalt. It is easy to use, durable, and even had alignment lines to help with the shingle installation.

Felt paper advantages

Just like hot dogs at a baseball game, people like what they know. And many roofers still use felt paper because it was the material they grey up using and working with. And it's still a viable product because it is cheaper and provides better traction during installation, especially on steep pitch roofs.

Secondly, felt paper is cheaper. When building a home, the cost of every material should be taken into account. Depending on the size of the roof, the difference in cost could be significant.

Felt paper specifications and physical properties data