does old attic insulation have to be removed?
I took a look at the insulation in my beau's attic for the first time (he's had it for 15 yrs, i've lived with him there for 5) and was shocked. :eek:
It is so old it looks like its breaking down. It's about 1 inch thick and the paper on top is all cracked and broken. We've talked about doing the blown in cellulose and will probably do it very soon. But, do we need to remove the old pink stuff first?
fwiw, the house was built in the 60s and remodeled by a previous owner in the early 80s. the beau purchased it "as is" in mid 90s. That insulation has to be at least 25 yrs old.
btw, i've searched this forum for similar posts and have seen all kinds of answers, so I thought I'd try a new post and see what I can find out.
Do us all a favor and tap your name where it shows whos posting and edit your location for better info.
Open this up to see how much insulation was suppost to be up there.
If your going to add more insulation you have to make sure the soffits do not get blocked up by adding foam baffles, is there a ridge vent on the peak of the roof?
Sounds like the insulation may have been installed up side down. The paper was suppot to go toward the conditioned surface. All you should be seeing is insulation not paper on the top side.
There no reason to remove what you have just flip it over so the papers toward the ceiling and add more over it.
thanks for the quick reply.
i guess we could flip it over but the paper is so cracked and deteriorated that it doesn't look like it would work as a barrier. It looks like it would just fall to pieces if we moved it. Should we buy something to use as a barrier?
Then just remove it and add new R-30 fiberglass backed insulation.
While the insulations out hit all the light fixtures and fan boxes with spray expanding foam to stop ait leaks.
Instead of fiberglass batts, I would go to the local box store and buy cellulose insulation. If you buy more than 20 bags, they let you use their blowing machine for free.
The reason is that cells lets less air flow than the fiberglass. Not to mention it is less expensive......:whistling2:
I'd remove and discard the f.g. and air seal as said before adding new insulation: http://www.google.com/url?sa=t&sourc...wWATQw&cad=rja
The old f.g. batts can help you find the existing air leaks effectively, thus stopping the "stack effect": http://www.finehomebuilding.com/PDF/Free/021105092.pdf
At 1.5-2# per sq.ft. the cellulose would crush the f.g. same as a small water bottle every foot apart. This would mute the f.g. and interfere with the cellulose' ability to air seal as well. Be sure your ceiling can handle the added weight load: http://www.energyguide.com/library/E...SubjectID=8375
Can foam the wiring/plumbing holes in the basement/crawl floor above as well to stop the upward replacement air drive:http://www.wag-aic.org/1999/WAG_99_baker.pdf
And, welcome to the forums!
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