The specific manufacturing process produces synthetic underlayments with different properties such as the thickness, exposure time, and resistance to damage during the installation process, etc.
Most synthetics are spun or woven from either polypropylene or polyethylene. Importantly, asphalt-saturated felt underlayment is commonly allowed by local building codes. Asphalt-saturated felt underlayments are semi-permeable and typically have a perm rating of five to seven.īuilders and architects have used asphalt-saturated felt underlayment for decades because it is a low-cost material and is easy to install. Thirty-pound felt is more thick and stiff than fifteen-pound, so thirty-pound is more resistant to damage during installation and can protect the roof longer if exposed to outside elements like rain, wind, hail, and snow. It comes in two thicknesses: fifteen-pound and thirty-pound. Roofing asphalt-saturated felt is a blend of cellulose, polyester, bitumen, and asphalt, soaked in a waterproofing agent. The shingles are the primary weather barrier.
The underlayment provides a secondary weather barrier against wind-driven rain and snow. Synthetic Roof Underlayment Vs. Asphalt FeltĪsphalt felt and synthetic underlayments are products installed under all the roofing materials and directly on a roof deck. However, an added advantage of Barricade ® Underlayments is they save time and money because they can be installed quicker than standard 36” wide felt underlayments. Barricade ® Roof Underlayments have all of the benefits of both asphalt-saturated felt and synthetic underlayments.
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