Roof Underlayment Thickness

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Roof underlayment thickness.

Roofing felt s thickness is not a measurement of its depth because it is thin similar to heavy paper. See actual warranty for complete details limitations and requirements. Loads will vary with the pitch of the roof. Gcp applied technologies grace ice and water shield 36 in.

Roofing underlayment or felt helps prevent unevenness in the roof sheathing from telegraphing through the shingles. For example one company might sell a product as being 24 gauge but in reality the thickness of the metal could vary from 0 018 to 0 0335 based upon exactly how that company looks at things and how big of a tolerance they allow for. Most roofs will be sheathed in plywood at least 3 8 inch thick. Roofing felt s thickness is actually measured in pounds per square with one square equaling 100 feet of roofing material.

The underlayment can make it through the summer heat winter snow and spring rain on a low slope roof without anything covering it. Rhinoroof u20 roof underlayment is part of the owens corning total protection roofing system. Special application required for extended exposure. The problem with metal roofing gauge is that there is a wide range of tolerances.

Roofing underlayment or felt is usually required for the ul fire rating to apply since shingles are usually tested with underlayment. The roof deck should be sound and level before laying the underlayment. You can see the difference between the underlayment overlapped 19 inches on the roof to the right and overlapped 2 inches on the roof to the left. 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 typically available in two types. In steep slope roofs 4 12 and steeper the upper courses of felt underlayment should overlap lower courses by at least 2 inches. And this synthetic roof underlayment becomes famous due to its quality easy installation process and affordability. Epilay s underlayments come in several grades from protectite platinum which features 17 mil thickness all the way to protectite superior which is a 7 mil underlayment.

There is also protectite plasfelt which is our lightest underlayment but still comes with superior tear strength to traditional felt underlayments. Fifteen pound or heavier felt underlayment is required by code in some areas. That will suffice on a roof with rafters set 16 inches apart with minimal roof loads.