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Old 11-13-2010, 10:39 PM   #1
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Does old fiberglass insulation equal new fiberglass insulation?

Just about to start reinstalling the fiberglass insulation back into the walls of a '62 Bambi. I managed to save some of the old insulation that was clean ( relatively), and was wanting to put it back in, along with some new fiberglass blanket I have, to make up the balance, which has a R1.2 rating. Would the nearly 50 year old batts still rate?

Pete
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Old 11-13-2010, 10:45 PM   #2
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I would replace the old with new fiberglass.
The newer material appears to be made from finer fiber and has a softer hand.
I think it might be slightly more effective, but I don't have any data to prove it.
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Old 11-13-2010, 11:08 PM   #3
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Fiberglass insulation 3.5inches thick comes in R-12 and R-13.
I would replace all of it. It is not very expensive and then you know it is all the same.
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Old 11-14-2010, 12:42 AM   #4
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Yep, the blanket I am cutting to suit is 50mm ( 2 inches thick ).
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Old 11-14-2010, 05:12 AM   #5
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The new stuff may cause less itching.
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Old 11-14-2010, 07:05 AM   #6
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The insulation is not only for when you want to run your AC or heat, but helps keep the heat out or in so the AC or heat may not be needed at times.

Keeping this in mind, The question is, is it cost effective?
1. How much will it cost for all new?
2. What is any is the R valve difference between old and new?
3. How often do or will you use your AS?

In the process of my renovation I found the insulation was not a tight fit. With too many voids it is not very effective.

It should fit snug between studs and not any thicker than the walls. When you compress insulation it loses some if it's R value.
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Old 11-14-2010, 11:29 AM   #7
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Thanks, my main motivation for reusing what I could of the old insulation ( apart from having a bit of scottish in me!), is from a recycling/ consumption point of view. At times I have met false economies in reusing something or trying it to make good. Sometimes ask myself when faced with decisions on these trailers-" What would Wally do!".
Pete
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Old 11-14-2010, 01:16 PM   #8
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Have you considered the foil bubble insulation? Lots of notes on it here in the airforums and mice can not readily make nests in it!!
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