13 1 frequently asked questions.
Proper underlayment for metal roof.
Conversely felt underlayment is appropriate in conjunction with ice dam protection at eaves and other critical transitions in cold climates.
Overhang the roof rake edge 1 5 and cover the underlayment with a metal rake edge trim.
Architectural metal roofs with felt underlayment are best suited for buildings with proper slope and low moisture loads in dry or arid climates.
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The best underlayment for metal roofs.
Synthetic roofing underlayment is to be laid horizontally parallel to eave with printed anti slip side up starting at the bottom of the lowest roof eave with a 1 5 underlayment overhang at the eave covering the pre installed eave drip edge.
The quality and type of underlayments used on the project in the long term will affect the overall performance of the roof.
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Choosing the right roof underlayment.
It is imperative the underlayment is fully supported by a roof decking material as underlayments aren t meant to be used as the primary roof deck.
Selecting the right underlayments for a lifetime metal roof should be a primary concern for anyone thinking about specifying or choosing to install a metal roof on their home.
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Underlayment must also act as a secondary weather barrier in case the roof fails.
Traditionally metal roofs have used standard 30 pound felt paper underlayment.
The first goal of roofing underlayment is to keep the roof deck dry before installation of the metal roofing material.
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Once you ve selected the proper metal underlayment it is important to ensure the roof s surface is prepped and ready for installation.