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bryanp22 12-09-2013 10:12 AM

Fiberglass atic insulation
I have an older home with fiberglass attic insulation. It's unfaced and I currently have two layers. How can I tell what R value these two layers provide? I am in milwaukee wi so I need R49. I am trying to decide if a third layer would be required.


SeniorSitizen 12-09-2013 12:13 PM

Try this insulating schedule of many available.

bryanp22 03-23-2014 11:17 AM

Okay so now that is a little warmer I probably have around R30 in my attic currently. Is it okay to add a third layer of R30 fiberglass or does the weight of the R30 start to be a concern for the two exiting layers that I have?

joecaption 03-23-2014 02:31 PM

Not going to be an issue.

joecaption 03-23-2014 02:33 PM

Really should be adding baffles to keep from blocking the air flow from the soffits to the roof vents.

bryanp22 03-23-2014 04:10 PM

I have no soffits. Old house from 46 that architecture review commission for village won't let people modify the roof line to add a soffit

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