3mm or 6mm plywood for floorboard covering

Postby coleby » Sat Nov 08, 2008 6:08 pm

I asked my builder to put some plywood on my floorboards and he went ahead and put down 3mm plywood.

Somebody then said he should have used 6mm plywood because of the extra soundproofing it gives.

Can anyone advise on this ?
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Postby dennis graham » Sat Nov 08, 2008 9:57 pm

dont think it makes that much difference, in loft conversions we lay fibre glass to do same job, noise will still transmit through even at 18mm,
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Postby GaryS » Wed Dec 31, 2008 12:45 am

The main difference between 3mm and 6mm ply is that if the floor was uneven to start with the 3mm ply will tend to follow the curves of the subfloor more than the 6mm soundproofing is not an issue with either as both will transmit sound. so if your floor is now flat you are ok if not you may have to have another layer of 6mm put on top or lift 3mm and replace with 6mm
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