fiberglass with spray foam


Old 07-15-08, 09:53 AM
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Join Date: Jul 2008
Location: St. Louis, MO
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fiberglass with spray foam

I have just added an addition to my house with closed cell spray foam in the walls and ceiling. The spray foam was applied to the bottom of the roof and the roof is a scissor-truss type. I would like to boost the R value of the ceiling before I install the drywall ceiling. Can I add fiberglass (batt or blown)? Will mold be a problem. I live in Missouri - hot in summer, cold in winter.
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Old 07-20-08, 05:45 AM
Join Date: Nov 2001
Location: USA
Posts: 1,873
The closed cell foam qualifies as a vapor barrier and adding fiberglass insulation will probably cause a moisture problem.
Old 07-23-08, 10:08 PM
Join Date: Apr 2008
Posts: 32
If your attic already has expanding spray foam insulation then you are finished. No need for more insulation, as this is one of the or the best insulation available. Do not add fiberglass, as "resercon" said, this will only be a problem. It sounds as though you are ready to proceed. Good luck.
Thanks for listening.

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