I am trying to make effective use of a basement space below a
residential space in an industrial building. I am concerned
from the basement uses will interfere with the resi tenants
I am thinking of using resilient channels for the ceilings.
The space is
about 28 ft by 28 ft and the ceiling joists are about 16" on
Will insulation help with sound
transmission or is dead space
Will furring strips attached to the joists with sound
suppressing tape on
the resilient channels help with sound transmission?
Have you any video of a sound suppressed ceiling
Thanks in advance, Harry
Thanks for you questions and interest in the site.
Resilient channel is perfect for your application as it will stop the
sound vibration through the joists.
You only screw one side of the channel to let it float. Make
sure you don't screw through the channel and into the
joists when installing your drywall.
Also fill the joist space with insulation to help deaden the
You can also use the tape or acoustical caulking which gives
I don't have a video on this application yet, I have some
videos up my
marksavillechannel on youtube.
If you have more queations, just ask.
Do you know what is
the STC rating for a hardwood floor with 10" joists?
To that number I suppose the resilient channel will add 10 STC points.
The Quiet Rock adds 10 more
The cavity with insulation adds just 3 Sheet rock 5/8 adds
Since the Quiet rock is a finished product I don't intend to add
Can you think of other stuff I can add to enhance the STC
there a tape I can add to the joist before I screw in the resilient
Thanks for your advice.
example of resilient channel. Photo Mark Saville.
I haven't actually used the Quiet Rock but have read that it is
a good product.
Roxul Safe'n'Sound Insulation is also a good bet for the
I know some are going with R channel, 5/8" then another R
and another 5/8" making a very good structure, all depends on
how much a person wants to spend and what number you're
You can actually attain around 60 total with that system.
As far as the building code is concerned a minium of 50 total
I would guess the flooring and joists would be some where
There is also the accoustical caulking Green Glue you put
of sheetrock which can be used between the R channel and
Hope this helps?
The channel needs to flex away from the joists to
be effective but you can put an accoustical caulk
in between the fastening flange and the joist.
I think if you fill the space with insulation,
use the channel and a layer of quiet rock you
should get 50 or more.
The hardwood may not be as good as subfloor depending on the joints.
I figure your existing floor should be around 30
compared to a 2x4 wall with 1/2" sheetrock both sides, no insulation is
My architect told me that the 1" hardwood floor
and the joist together
gives a rating of 37. I thought that seemed too high as we
conversations between the two spaces as if they were in the same space!!
But the Quiet Rock and resilient channel adds 20 so whatever the number
floor this should augment it.
Is there something that can be attached to the noise between it and the
resilient channel ? Or is that unnecessary given the flexing
And I think I shall skip the sheetrock since it only added 3 to the
and is heavy
Mark: Thanks for the advice. I did do a resilient ceiling under the
as suggested and used 6" of insulation in the joist spaces and Quiet
I will now apply compound and test for sound.
1. Do you know a simple and not too expensive way
of checking the sound
Glad I could help.
If you can find a db meter you could test it that
Low frequency seems louder to the human ear than high so if you play a
stereo with the bass really loud on one side,
test the db level with the meter, then test on the quiet side,
if the sound is 100 db on the loud side and 50 on the quiet side,
you've attained a STC of 50.
If you have a smart phone with a recording feature, you can probably
get an application that tests sound levels.