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soundproofing with a layer of cork under hardwood.

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soundproofing with a layer of cork under hardwood. marson 01-10-2007
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Posted by Michael Bulatovich on January 10, 2007, 7:54 pm

>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?


Yes, but not totally. Is that why he's doing it?

> 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.

Assuming we talking about 3/4" oak, I don't like that at all. I'm picturing
premature squeaking at least, which would be kind of ironic.
--


MichaelB
www.michaelbulatovich.ca



PexSupply Full Banner
Posted by Ken S. Tucker on January 11, 2007, 2:23 pm

Michael Bulatovich 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?
>
>
> Yes, but not totally. Is that why he's doing it?
>
> > 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.
>
> Assuming we talking about 3/4" oak, I don't like that at all. I'm picturing
> premature squeaking at least, which would be kind of ironic.

Yeah, would just glue work? I find Carpenters glue
is very strong. We basically use screws until the
glue sets and then they're unnecessary.
Ken



> --
>
>
> MichaelB
> www.michaelbulatovich.ca


Posted by Deputy Dumbya Dawg on January 11, 2007, 10:26 am

: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?
:

It will probably short any isolation ability the floor
had to airborne sound traveling through the floor but
will have no effect on the impact reduction the cork
will provide on reducing footsteps from traveling
through. If he is interested in reducing the sound
transmission coefficient of the floor ceiling system
there are much better ways to get more isolation at a
broader range of frequencies than you are trying.

start here http://www.recording.org/forum-34.html

peace
dawg



Posted by per.corell@privat.dk on January 11, 2007, 4:44 pm
Plain wood glue the cheapest water soluted pva poly vinyl acetat ---
think about the surface it engage and, you will not have metal rods
transmitting the sound.


Posted by Noral Stewart on January 11, 2007, 7:47 pm
Right that nailing through cork will negate much of the benefit. There are
engineered wood floors that can be floated on top of the cork. It is tricky
to isolate nailed-down hardwood. This is one specialty product that can
work by floating the nailers with minimal extra thickness.

http://www.soundseal.com/impacta/soundeater.shtml

Isolating footstep sounds on wood frame construction can be very difficult,
and you will always be left with a low-frequency thump to some degree no
matter what you do.

For best results he needs to also isolate the ceiling from structure and
install sound absorptive material in the cavity. These steps also help for
airborne sound such as speech or music. The cork or other material under
the floor surface is primarily to control the tapping sound of feet on the
hardwood. It does not do much for airborne sound.

If he is serious, he should get professional help from an acoustical
consultant experienced in wood-frame condo design.


>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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