Soundproofing a Wall

Uploaded by ASIsoundproof on 06.04.2011

Alright, we've got a standard 2x4 wall space two foot on center.
We're doing 1/2" drywall on the back side.
Finish drywalling this side - standard 1/2" drywall wall.
Then next up we're going to put in the 3 1/2" R-13 cotton insulation.
This side of the wall is now finished. 1/2" drywall on standard two foot center studs
with standard construction. We can go around to the other side and Mitch
is finishing up the R-13 cotton insulation on the backside. So we'll walk over there
and take a look at that.
We're just cutting the last piece to 84".
Then we'll add a layer of 5/8" drywall leaving a 1/4" gap all the way around the outside
for acoustical sealant.
Alright, so what we've got here. We've got the 1/2" drywall on the back of it, 2x4 framed
wall 2 foot on center. This side we've got 5/8" drywall installed
just like you would on a regular wall. We've got R-13 UltraTouch Insulation. It's
a recycled cotton. We prefer that over fiberglass because it
absorbs the soundwaves a little bit better.
The only thing different on this wall is we've left an 1/8" to a 1/4" gap between the drywall
and the edge of the framing. Then we're coming back with an acoustical sealant and sealing
that 1/8" gap and that decouples this drywall from the framing of the wall.
Letting this drywall move independently from the rest of the wall framing.
So, we will fill in this last piece of drywall and when we come back we will put the second
layer of 5/8" on top of this layer, staggering the seams with a layer of green glue in between
the two sheets of drywall.
So now we've got the original layer of 5/8" that we just put on.
We're still maintaining 1/4" gap at all of our framing. We've filled the back layer with
acoustical sealant. Including, we've got a 1/4" gap between the
drywall and the concrete floor. That's been sealed with acoustical sealant.
Our next sheet's about to go up here. We've got all of our seams offset so we don't
have any seams stacked between the first layer and the second layer.
Mike's applying the Green Glue over here onto the top layer.
You use 2 tubes per 8 foot sheet. So we've got a 10 foot sheet here, we're gonna use
2 and 1/2 tubes of Green Glue on this one. When Mike gets that applied we will spin this
sheet around, slide it in place and attach it like a standard sheet of drywall using
2 to 2 1/2" screws because we've got to go through two layers of 5/8" drywall and still
get into the framing.
Alright, so we're spinnning the sheet into place.
There we go.