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Spray-on housewrap

Robert Martin | Posted in Energy Efficiency and Durability on

My contractor asked me to look into doing a spray-on housewrap instead of a normal wrap.
He said I could cut down on using insulated siding and in-house spray-in foam. I like the idea of the spray-on housewrap but not sure about its effect versus spray foam inside.

Any insight one way or the other on this subject. This is new construction.

Thanks,

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Replies

  1. GBA Editor
    Martin Holladay | | #1

    Robert,
    This type of product is usually called a liquid-applied WRB. (A WRB is a water-resistive barrier.)

    The purpose of a WRB is to act as a barrier to wind-driven rain that gets past the siding. It protects the wall sheathing from rot.

    On the other hand, spray foam insulation has a different purpose. It is usually used as insulation (to provide R-value) or to reduce air leaks.

    It's true that a liquid-applied WRB is also useful at reducing air leakage, so in a sense there is some overlap between a liquid-applied WRB and spray foam. (If you made a Venn diagram, the area where the two circles overlap would be labeled "helps reduce air leakage.")

    For more information on liquid-applied WRBs, see Housewrap in a Can: Liquid-Applied WRBs.

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