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Basement Finishing and Renovations Has it been 2 years already? Time to work on finishing the basement into some extra living space.

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Old 2017-09-22, 12:47 PM
dvg dvg is offline
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Default Basement vapor barrier - poly sheet enough?

I am looking at the costs to finish my basement.

I am sort of shocked at the cost of polystyrene foam. My understanding is that the main purpose of the polystyrene is to serve as a vapor barrier- keeping moisture from the wet concrete out of the house. Im wondering if this could just be done with a poly sheet instead, as is done above grade in a house.

If so, I don't really see the purpose of the polystyrene. It is expensive and does not look easy to work with. If I wanted better insulation I could just use 2x6 studs and get almost the same boon to the R rating at a lower cost.

If anyones curious, I have arrived at estimates of 3.71/sq ft for the floor (DMX,OSB, rolled rubber for gym), 3.85/sq ft for the ceiling (Drop ceiling), 0.65/sq ft for uninsulated walls, and, either 1.45 or 2.95 for insulated walls, depending on the answer to this question.
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