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Is it better to foam the attic floor if there is nothing in it as far as mechanical?

jmo58 | Posted in Energy Efficiency and Durability on

Just wondering if that was correct.


  1. GBA Editor
    Martin Holladay | | #1

    Better than what?

    There are many kinds of insulation available. When you write, "foam the attic floor," I'm guessing that you are referring to spray polyurethane foam. That is one type of insulation, but it's not the type that is generally used for attic floors. If you want to use it, however, it will perform well. It is likely to cost more than other types of insulation.

    Regardless of what type of insulation you decide to install on your attic floor, you need to pay attention to air sealing. One advantage of spray foam is that it does an excellent job of air sealing. However, many builders manage to seal air leaks without any spray foam -- for example, by following the Airtight Drywall Approach.

    For more information on insulation options, see Insulation Overview and Insulation Choices.

    For more information on air barriers and air sealing, see Questions and Answers About Air Barriers.

    For more information on the Airtight Drywall Approach, see Airtight Drywall.

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