Attic Insulation

pete_p_nyDecember 17, 2011

I wanted to insulate my attic. It has 1963 vintage kraft faced insulation...probably 2 to 3" think. It is in ratty condition (matted down, some areas breached from prior work in the house, etc). Am I better off pulling it all out and dumping in fresh kraft faced insulation? Or covering over the top with unfaced insulation. From the sheetrock to the top of the joist is 9". I also saw on a home show, a builder cut strips of poly plastic sheeting and layed it in each joist and covered with unfaced insulation. Not sure if that is worth the effort, but it supposedly unfaced is considerable cheaper in cost.

Thank you for reporting this comment. Undo
david_cary

Mostly I see blown in insulation which is nice because you can cover the joists and get a much higher r-value - ie r-60 and even above. I can't remember if that is a problem in NY - I wouldn't think so. Lowe's rents you a machine to blow for free. You would remove the old insulation - just because it may be moldy and it isn't doing much anyway.

The vapor barrier question is a big one so you need to be sure on that. I am 90% sure you would be fine but I'd want to be sure.

    Bookmark   December 18, 2011 at 6:00AM
Thank you for reporting this comment. Undo
JoeMCorbett

Don't use poly on the ceiling for any reason. It is a bad idea.

Here is a link that might be useful: Corbett Cooling

    Bookmark   December 18, 2011 at 3:57PM
Thank you for reporting this comment. Undo
pete_p_ny

Why is poly bad? I see it being used on many home shows?

    Bookmark   December 18, 2011 at 5:31PM
Thank you for reporting this comment. Undo
joe_mn

friend had his blown/batt attic insulation removed and than put down a layer of spray foam and had cellulose blown on top. says 2nd floor is much warmer now. he had areas that had drafts and leaks before and wanted a tight leak free install.

    Bookmark   December 19, 2011 at 8:37AM
Sign Up to comment
More Discussions
Problems with HVAC in 1958 Cape Cod
I've been reading the blogs here and hope that the...
ginaff58
Floor Air Register and ductwork
In recently doing light cleaning on air registers in...
Char Holdenried
Advice on HVAC & Insulation issues
I have a few questions that I would love to have input...
cinamn808
Trane American Standard UY080R9V3W Won't Light When Cold
I have an interesting problem with my 4 year old American...
jmcqueen
Navian condensing combi, good or bad?
Hi, I am looking into converting from oil to gas and...
rickyk22
© 2015 Houzz Inc. Houzz® The new way to design your home™