What Function Does Shingle Underlayment Serve?

What function does shingle underlayment serve?

An underlayment, commonly known as roofing felt, will:

• Protect the roof deck from moisture prior to shingle application

• Provide a degree of backup protection in the event water gets under roofing shingles.

Some local building codes and UL standards require that a shingle underlayment be installed.  Ask your roofing contractor if this is the case in your area.  Also, some manufacturers offer a special underlayment product which prevents leaks caused by water backup from ice dams—a common condition in many winter snow areas.  Protection against ice dams can be obtained by using a waterproofing shingle underlayment at the eaves or lower edges of the roof, in addition to installing adequate ventilation and proper insulation in the attic floor. (See Protecting Your Home From Ice Dams) Ask your roofing contractor about these specialized underlayments.

Need to Know More?

We hope this months posts have provided you with some insightful information regarding the re-roofing process.  Our intention is not to overwhelm you with information, but rather offer you a reliable resource for easy reference.  If you have any questions or comments, we would be happy to hear from you.  In addition, if you did read our “‘Choosing a Roofing Contractor” article, or if you would like any other information on specific products, please write or call us at: 612-617-1717
Mailing Addresses
110 Bank Street-Suite 406
Minneapolis MN  55414


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One Response to “What Function Does Shingle Underlayment Serve?”

  1. Ice Dams Have Been A Big Problem For Minnesota Homeowners « Stormdamagerepairmn’s Blog Says:

    […] existing roofs, waterproofing underlayment is only an option if you remove the existing shingles or are building a new addition.  Either way, […]

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