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Posted by thetiler on January 14, 2007, 12:39 am
1/4" cork is an effective soundproofing. Where the most sound
transfer will take place is at the perimeters, where the wood meets
the walls- that is transfer of sound into the walls and down from
there. The fasteners will transfer a smaller percentage of sound.
Even with fasteners, the cork would help quite a bit.
I don't understand why the 1/2" layer of plywood on top? Why
not just glue down the cork, then nail the wood directly on top of
it into the 3/4" subfloor?
Also, there is 1/2" inch cork, and more expensive and thinner
sound proofing membranes available that have higher
sound proofing qualities and are denser if needed.
For a correctly done job, he should glue down the cork, then
go directly over it with a 'floating' wood floor such as wood
laminate (pergo). Then there wouldn't be any transfer of sound
with fasteners, and since the flooring doesn't touch the outside
walls- no sound transfer.
Many condo's here require 1/2" of cork, which makes a
great sound proofing material and is inexpensive, and the pergo
type floor can be laid directly over it.
I'm guessing at all this though since my subflooing/soundproofing
experience is all with ceramic/porcelain tiles and I don't use
fasteners (not for the tile anyway :-)
In tilework the floor needs to be extremely strong so.......
in my case I would add the 1/2" plywood to the 3/4" plywood,
glueing and screwing those two together, then glue down
cork (when soundproofing is required), then thinset down tiles.
thetiler
marson wrote:
> I am building a house for a customer who is planning to do his own
> hardwood flooring installation (above grade, installed on 3/4"
> plywood.) He recently informed my that he intends to install a layer
> of 1/4" cork, then a layer of 1/2" plywood, then his hardwood strip
> flooring (nail down).
>
> I have two concerns about this: first, wouldn't the fasteners that you
> use, both to fasten the 1/2" plywood and then to staple down the
> hardwood, penetrate into the subfloor and negate the soundproofing
> qualities of the cork?
>
> Second, what do you think of nailing hardwood flooring into 1/2"
> plywood? I am somewhat skeptical about the nail holding ability of
> just 1/2" plywood.
>
> Anyone done this or know about this?
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