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Old 01-21-2013, 08:57 PM   #1
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Rigid Insulation to insulate and create attic floor.


I have a 1928 house with the original insulation mat in the attic. A portion of the attic has been floored over with plywood. I was thinking of pulling up the plywood and adding layers of polystyrene sheets for increased R value and then putting the plywood back over the XPS to maintain surface to store stuff on. Is this a feasible solution?

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Old 01-24-2013, 09:15 PM   #2
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Rigid Insulation to insulate and create attic floor.


Welcome to the forums! I would not use the attic as storage. Gary

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Old 01-24-2013, 09:34 PM   #3
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Rigid Insulation to insulate and create attic floor.


That would also form a vaper barrier on the wrong side which can trap moisture and cause mold.
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Old 01-25-2013, 05:38 PM   #4
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Rigid Insulation to insulate and create attic floor.


If you must, and in a heating climate: pp. 24 and read the article, air seal first, etc.; http://www.buildingscience.com/docum...ation-packages

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