#1
I have a few mattresses lying around in the shed. I think we might have three spare. Maybe one or two big thick rugs as well. Can these be used to soundproof? Even just a little bit?

Thanks.
#2
It should help, cardboard and foam is also a cheap alternative if you're willing to go further.
#3
Yeah I've see it done with egg cartons and rugs. Foam would be good too.
good luck
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#5
Something else came to my mind, I replaced the wooden door in my jam room with a heavy duty metal-ish door a couple of years back and it made a HUGE difference. Just a suggestion if you have some spare cash.