Quote:
Originally Posted by Wobs
If you put any more on top, not only are you looking at diminishing returns in terms of additional insulation, but you will be reducing the effectiveness of the insulation at the bottom as it will be squashed with less air trapped in there.
Have you insulated the hatch? I found sound rigid stuff in a skip which did the job perfectly. Also fitted draft proofing around it as well.
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Just a thought on squashing lower insulation by adding more. I don't think this is a problem in a case like this where the top layer is going cross wise to the ceiling joists. That support will protect the lower stuff.
The blown in insulation like cellufibre, is great for filling in around air leaks but does not have the built in structure to avoid compaction, especially if there is any chance that it can get wet.