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  • Green Apple Insulation
    Keymaster
    Post count: 2

    Every home is different and in some case climate plays a big factor in which product is best for the project at hand. We typically use closed cell about nine times out of ten since we service most of the southeast region of the untied states.

    Sub tropic regions such as mid or south Louisiana generally require closed cell due to average ground moisture content and humidity level typically ranging from 80%-100%. Closed cell is crucial in these conditions mainly because closed cell foam is rated as a two pound density foam and it’s cell structure is considered closed which doesn’t alway it to absorb moisture is wetter climates.

    The reason this is important is because if you were to use open cell in this same environment it would evenly absorb moisture and basically act as a wet sponge attached to the underside of your home. Over time this can result in floors cupping or buckling. Wood rotting and structural failure. Mold growth as well as attract termites.

    Green Apple Insulation
    Keymaster
    Post count: 2

    Tab,

    Your situation is very common, a large majority of homes in the New Orleans area were in fact built with this style of subfloor for the simple fact to allow air flow to circulate throughout the home during the hotter months of the year. This was a great idea when we depended on the outside elements to keep our homes cool in the summer, but now with central heating and cooling we have to retrofit our homes to work properly with this new technology.

    So there is a lot of controversy with open and closed cell spray foams when it comes to subfloors. In the early years when spray foam was commercialized for residential application it was a learning curve for most companies getting into the business. So there was mistakes to be made.

    So to answer your question, 2 inches of closed cell foam would be the best option for your particular situation. It will seal the entire underside of your home, and provide a total of about R16 of insulation value to the underside of the home. So no more drafts and no more cold feet. Also I’d like to add that sealing up those cracks and gaps will help prevent those unwanted insects and bugs out of your home as well.

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