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  1. #1
    Join Date
    May 2009
    Posts
    2

    Default air flow under deck

    Replacing old rotting wooden deck and wondered if the following would help control or eliminate moisture problem. New deck will be enclosed on the bottom to eliminate wildlife from crawling under. Would it be necessary to put air vents in several sides and to put plastic sheeting and stones to prevent moisture from rotting under decking support boards?

  2. #2
    Join Date
    Dec 2007
    Location
    MN
    Posts
    455

    Default Re: air flow under deck

    Hopefully you will be using pressure treated lumber for the deck framing.
    If the deck is raised off the ground you shouldn't need to put plastic down under the deck as long there is air circulation.
    What we did for our cottage was to enclose the bottom of the deck with lattice and chicken wire to prevent wildlife from homesteading under the deck. Going on 12 years and works fine.

  3. #3
    Join Date
    May 2009
    Posts
    2

    Default Re: air flow under deck

    The original deck that is being replaced is enclosed around the bottom with lattice. Over the years it has sagged and the light allows weeds and 0ther vegetationto grow out thru the open spaces. In consideration of this would the vents help as well as putting down the plastic sheeting?

    Thanks for the input.

  4. #4
    Join Date
    Aug 2007
    Posts
    612

    Default Re: air flow under deck

    I would make sure there is adequate airflow under the deck. I would also put the plastic on the ground and cover it with stone to keep it in place and to keep any UV rays that can reach it from breaking it down. Make sure it is sloped away from the house. You don't want the rainwater to run on top of the plastic toward the foundation.

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