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Your guess on R value?

teds tools's Avatar
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10-20-03, 03:42 AM   #1  
teds tools
Your guess on R value?

WE have a cement block house with dry wall on the inside. I have no idea how much if any insulatoion is behind that drywall. Is a cement block itself any insulation? there is dead air space in it after all. My brother thinks I should tear off all the sheet rock and put up insulation ( we live in Michigan) I think he's crazy. So what is you opinion of the potential R value of the block. The bottom of the house is face stone and the top half is wood siding Thanks Ted

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chfite's Avatar

Join Date: Nov 2001
Posts: 9,483

10-20-03, 06:12 AM   #2  
This thread discussed this very question. You might want to take a look.


Hope this helps.

marcusl's Avatar

Join Date: Apr 2002
Posts: 125

10-23-03, 11:45 AM   #3  
Not much

I bet you have insulation behind your drywall, otherwise you'd be running $1000/month heating bills and have ice on your kitchen walls during the winter.

The 8" concrete blocks have an R-value of about 1 (see http://coloradoenergy.org/procorner/stuff/r-values.htm), which is comparable to that of a single pane window (burr!). You may have some sort of fiber sheathing behind your wood and stone siding, which would add another R-1 or so.

If you aren't insulated inside, almost anything you add will help. You can special-order 3.5" fiberglass batts that have a high R-15 rating. Install between studs and add drywall to get to usual wood-frame house standards. Even if you hire someone to do the work, it will pay for itself in a few years. Adding insulation to the celing/attic is also an excellent investment. R-38 is the current building standard in cold climates.

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