RIGHT WAY

TO­WARD THE HEATED SPACE

Old House Journal - - Ohj -

For the ceil­ing of a cool base­ment un­der a heated level: It’s al­ways best to po­si­tion the va­por bar­rier to­ward the heated space, that is, just un­der its floor. The op­po­site is true for an un­heated at­tic, where the va­por bar­rier is usu­ally placed against the ceil­ing of the space be­low. In both cases, the bar­rier holds back wa­ter va­por gen­er­ated in the house, pre­vent­ing it from con­dens­ing on cooler sur­faces in base­ment or at­tic. Wet in­su­la­tion is less ef­fec­tive and can lead to peel­ing paint and rot.

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