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fiberglass with spray foam


HM123's Avatar
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Join Date: Jul 2008
Posts: 1
MO

07-15-08, 09:53 AM   #1  
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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resercon's Avatar
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Join Date: Nov 2001
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NJ

07-20-08, 05:45 AM   #2  
The closed cell foam qualifies as a vapor barrier and adding fiberglass insulation will probably cause a moisture problem.

 
DIYAnswerguy's Avatar
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Join Date: Apr 2008
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WA

07-23-08, 10:08 PM   #3  
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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