jak531 Posted August 26, 2004 Report Share Posted August 26, 2004 I ran into an attic that had 24"- 28" of blown cellulose!? 10"-12" is the norm around here (northeast) Seems to me there is such a thing as too much? It was applied professionaly vents weren't blocked, nice and even. Whats your take on this. Thanks Quote Link to comment Share on other sites More sharing options...
Brian G Posted August 26, 2004 Report Share Posted August 26, 2004 If the vents weren't blocked and the weight didn't become a factor, I can't think how more could hurt. Brian G. Quote Link to comment Share on other sites More sharing options...
Steve Knight Posted August 26, 2004 Report Share Posted August 26, 2004 The research on attic insulation shows a declining rate of return after R Values of R-50 (16" of cellulose)have been obtained. This is about the maximum level of insulation I see. After this level is obtained, the cost of insulation and labor to install the insulation will exceed the savings in energy costs over the life cycle of the house. As long as the insulation doesn't block vents there should be no problem caused by additional insulation. Quote Link to comment Share on other sites More sharing options...
hausdok Posted August 26, 2004 Report Share Posted August 26, 2004 Like Brian, I think that weight is the biggest factor here. Cells is heavy. Hope they've using better than 1/2 drywall there. I think that anything beyond R40 in cells is wasted money, because I've heard that beyond that you get diminishing return on the thickness due to convective looping. That said, a few years ago I did a double-walled house designed by an HVAC engineer that had blown-in fiberglass wall insulation a foot thick and attic insulation that was about 48inches deep. He was so finicky about the insulation that he built a complete catwalk system through the attic so that nobody would ever have to walk on it or wade through it. ONE TEAM - ONE FIGHT!!! Mike Quote Link to comment Share on other sites More sharing options...
charlieb Posted August 26, 2004 Report Share Posted August 26, 2004 Thread Drift Recently inspected a property with a one year old detached garage. Pegboard over cellulose insulation. But one heck of a musty smell. The property had excellent drainage and no plumbing. No evidence of any water entry. I have not had the opportunity to "fondle" any of the product. Was the smell from the insulation? Quote Link to comment Share on other sites More sharing options...
hausdok Posted August 26, 2004 Report Share Posted August 26, 2004 Are you saying that he installed cells behind pegboard in the detached garage? Cells isn't generally musty smelling unless it gets wet. The borate the cells is treated with is kind of neutral - like being in a warehouse full of salt - but it stinks to high heaven when it gets wet, stays that way for a while and molders. Also, rats and mice love to tunnel into the stuff and live in it and those incontinent little bastards will saturate it. OT - OF!!! M. Quote Link to comment Share on other sites More sharing options...
charlieb Posted August 27, 2004 Report Share Posted August 27, 2004 Yes, I had not considered the critter factor. The property is rural. Sacks of corn stored and some scattered at the tree line! Thank you for the response. Quote Link to comment Share on other sites More sharing options...
jimmy Posted February 21, 2009 Report Share Posted February 21, 2009 11 inchs of celloulose is an r 38 it might look profesional but it isnt Quote Link to comment Share on other sites More sharing options...
hausdok Posted February 21, 2009 Report Share Posted February 21, 2009 Hi James, I'm not exactly sure what you're saying. Care to elaborate? ONE TEAM - ONE FIGHT!!! Mike Quote Link to comment Share on other sites More sharing options...
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