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Thread: Basement

  1. #1
    Join Date
    Mar 2004
    Posts
    8
    Hi,
    Would insulation on the outside of a walk in basement exterior wall help reduce condensation in basement? Basement has 2 walls below grade and interior walls are 2x6 insulated.
    Thank you,
    Marcel.

  2. #2
    Join Date
    Jun 2003
    Location
    Madison, WI/Cape Coral, FL
    Posts
    6,261
    Originally posted by marcelds
    Hi,
    Would insulation on the outside of a walk in basement exterior wall help reduce condensation in basement? Basement has 2 walls below grade and interior walls are 2x6 insulated.
    Thank you,
    Marcel.
    Warming the surfaces, walls and floor of a basement allows a higher dew point of the air in the space. Lowering the dew point of the space allows a cooler surface without condensation. Insulating the walls without warming the floor leaves a wet floor. Dehumidification solves both problems and makes the space very comfortable. It's impossible to dehumidify with a small inefficient toy domestic dehumidifiers that freezes-up easily. Until the dew point is reduced well below the surface temperatures, mold growth continues. Keeping a cool surfaced space below 50%RH avoids the mold musty problem. You need enough capacity like a pint/day capacity per 20 sq.ft. of floor. The most efficient dehumidifiers remove 5 pints per KWH compared to 2 pints per KWH from the toys. The most efficient unit in the world is Santa Fe/Ultra-Aire.

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