I’m sound proofing a basement cieling and am installing the sheetrock on suspended resiliant channel 24″ oc, and the book I have from USG recommends a flexible material, like a glue, onto the channel to rock to cut down any left over vibrations. Makes sense. You guys use anything special? I was thinking maybe silicone, I have regular drywall glue that I use all the time but that’s not so flexible. Or is it? Suggestions?
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Replies
subfloor adhesive? It claims that it stays flexible.
Jer,
Regular mastic glues get too stiff to help much with sound. Here's a link to the site for a product made just for that purpose. http://www.audioalloy.com/
Bill
Thanks for that.
Jer, The correct way to use the resilient channel to achieve the STC rating is to rock the walls first ( strange but true ). The walls should not touch any of the RC on the ceiling ( otherwise you " short out " the RC ). The ceiling is then fastened with the appropriate length screw ( 1/2" rock=1" screw 5/8" rock= 1 1/8" ). Longer screws can be used, but be sure to not screw through the RC and into a joist ( again, "shorting out" the RC. The ceiling cannot touch the surrounding walls, and this gaps is to be filled with an acoustical sealant ( USG makes a specific product for this purpose ). To achieve the true STC Rating is a real PIA, but any "shorting out" and the RC benefits are drastically reduced if not eliminated. Hope this helps.
A huge help. Thanks alot.
Could you be looking for Acoustic caulking? I've used this product before to seal the inside corners and gap between the floor and the drywall and electrical cut outs for sound transmission.
Jer,
Accoustic sealant will do the job. It's the most cost effective
way to minimize the sound transmission. Silicone would definitely
work but is more expensive. Follow the USG reccomendations closely
and use RC-1 on the ceiling (not RC-2 or double leg) and the proper
length screws (don't hit a floor joist!!). A little care and you will be
amazed with the results!
Mclaren
I'm following that lead. Thanks again.