Reducing moisture/condensation issues in enclosed porch

Discussion in 'Insulation and Radiant Barriers' started by Gene, Nov 15, 2019.

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  1. Nov 15, 2019 #1

    Gene

    Gene

    Gene

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    I am in the process of enclosing a large roofed porch at our home in northern PA, using large insulated glass units installed between existing 6x6 posts. I plan to lay half-inch OSB sheets on top of existing decking, with vinyl flooring on top of that. The porch sits about 3 feet above a dirt surface. The enclosed porch will not be heated but will be used much of the year as a sunroom and will likely experience major temperature swings and possible condensation challenges.

    Should I place plastic sheeting between the existing decking and the OSB subflooring? Should I also place plastic sheeting on the ground beneath the porch? Any other advice regarding moisture/condensation?
     
  2. Nov 15, 2019 #2

    nealtw

    nealtw

    nealtw

    Contractor retired

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    I would use sanded plywood not OSB and yes you want to mound the fill under the porch so water can't gather there and cover that with a 10 mil poly. Allow some venting under the porch.
     

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