rlskfoster Posted February 24, 2005 Report Share Posted February 24, 2005 I had a friend call me today with a question on insulation addition. He was doing some remodel work for a couple and they wanted to add insulation to thier attic. He said there is approximately 6 inches of blown fiberglass insulation. He was wondering if there is any reason he can't go back over the existing blown fiberglass with 6 to 8 inches of blown cellulose. I don't him that I really didn't know but I did know where to go ask. Anybody got any suggestions or thoughts. Buster Quote Link to comment Share on other sites More sharing options...
Steven Hockstein Posted February 24, 2005 Report Share Posted February 24, 2005 I believe it is acceptable as long as there is no vapor barrier sandwiched in the middle. Make sure that the insulation does not block any of the vents. I commonly see soffit vents blocked by insulation. Quote Link to comment Share on other sites More sharing options...
hausdok Posted February 24, 2005 Report Share Posted February 24, 2005 Hi, I agree with Steven - no barriers. Cells is heavy though and he's going to lose some R-value when the FG is compressed. OT - OF!!! M. Quote Link to comment Share on other sites More sharing options...
kurt Posted February 24, 2005 Report Share Posted February 24, 2005 I'll bet he doesn't lose anything significant; the cell will fill in all the gaps that always exist w/ fiberglass & cut down on bypass. I've done this a bunch over the years; works great. Cellulose compresses on it's owner over the years; that's when you lose the R value by a few points. And, I freely admit to being a niggling wienerboy for getting this fine tuned..... Quote Link to comment Share on other sites More sharing options...
rlskfoster Posted February 24, 2005 Author Report Share Posted February 24, 2005 Hey thanks for the quick responses! I passed along the responses to my friend. He appreciates it also. Buster Quote Link to comment Share on other sites More sharing options...
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