Asphalt Shingle Applications

There are four basic types of underlayment that can be used under asphalt roofing shingles:

Slope Limitations:  On low-slope roofs, which include 2:12 up to 4:12 pitch, felt courses should overlap a minimum of 19 inches. This provides a double layer of underlayment across the entire roof.

On steep-slope roofs (4:12 and steeper), upper courses of felt underlayment should overlap lower courses by at least 2 inches.

 

Fastening: Atlas recommends that all underlayment be mechanically fastened using plastic cap fasteners.

Atlas recommends the use of any of the above underlayments to be used under Atlas asphalt shingles. 

For highest overall performance Atlas recommends the use of:

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