Hi, I am building a ceiling in the basement. For now, I have put up the rockwool between the joists and I have a special soundboard that I have screwed in the joists.
As for sound attenuation, is it better to use resilient channels when attaching my gypse (5/8 firecode) or should I screw the gypse in the joists?
This is really important guys... thx a lot!
francois
This is an emergency about ceiling
Moderators: Aaronw, kendale, John Sayers
-
tenkas
- Posts: 100
- Joined: Sun Sep 28, 2003 1:55 am
- Location: Quebec, Canada
-
John Sayers
- Site Admin
- Posts: 5462
- Joined: Mon Jan 27, 2003 12:46 pm
- Location: Australia
- Contact:
-
knightfly
- Senior Member
- Posts: 6976
- Joined: Sun Mar 16, 2003 11:11 am
- Location: West Coast, USA
Francois, this has been covered in the construction forum but you may have missed it - from top to bottom, you should have upper floor layers, then insulation between joists, then your Resilient Channel across the joists, and THEN your inner ceiling layers go on. If you put RC between your inner layers, you will have a triple leaf ceiling which is LESS isolation for the same materials. In some cases, it can be over 20 dB worse.
If you already have your "soundboard" fastened to the joists and don't want to remove it, the best you can hope for is to put your gypsum wallboard directly over the "soundboard" - you would want to offset all joints from one layer to the next, so there are no joints that line up with the joints in the next layer.
The difference between using RC and not using it will be at least 10 dB, which is a LOT - from my viewpoint, it's enough to bother taking down the soundboard and putting up the RC first - then, you should put GYPSUM up first (not soundboard) - follow the gypsum with soundboard, then a final layer of gypsum. Make sure the RC is about 25mm from touching the walls at each end of each piece of RC, and put spacers around the ceiling when putting up the panels in order to keep a 5-6mm gap between walls and ceiling panels - then, after ceiling panels are up, pull out the spacers and caulk with acoustic caulk.
Hope that helps... Steve
If you already have your "soundboard" fastened to the joists and don't want to remove it, the best you can hope for is to put your gypsum wallboard directly over the "soundboard" - you would want to offset all joints from one layer to the next, so there are no joints that line up with the joints in the next layer.
The difference between using RC and not using it will be at least 10 dB, which is a LOT - from my viewpoint, it's enough to bother taking down the soundboard and putting up the RC first - then, you should put GYPSUM up first (not soundboard) - follow the gypsum with soundboard, then a final layer of gypsum. Make sure the RC is about 25mm from touching the walls at each end of each piece of RC, and put spacers around the ceiling when putting up the panels in order to keep a 5-6mm gap between walls and ceiling panels - then, after ceiling panels are up, pull out the spacers and caulk with acoustic caulk.
Hope that helps... Steve
-
tenkas
- Posts: 100
- Joined: Sun Sep 28, 2003 1:55 am
- Location: Quebec, Canada
I have a brochure from sonopan and they did test (approaved by canadian federation) and they clearly say that when you build a ceiling OR wall, but SONOPAN directly on studs, then RC then GYPSE.
I called them up and talked to a specialized acoustic designer and he told me that the sonopan pannels have to be put BEFORE RC.... so I really don't know who I would believe or what... the only thing sure is that these pannels aren't comming off of the wood studs...
HELP ME JESUS lol
I called them up and talked to a specialized acoustic designer and he told me that the sonopan pannels have to be put BEFORE RC.... so I really don't know who I would believe or what... the only thing sure is that these pannels aren't comming off of the wood studs...
HELP ME JESUS lol
-
knightfly
- Senior Member
- Posts: 6976
- Joined: Sun Mar 16, 2003 11:11 am
- Location: West Coast, USA
I just checked out their website and they can't even make up their mind WHICH way to do it - they show a diagram of one ceiling where the floor is wood without carpet, and they show the RC right where I would have put it - directly on the joists.
Then, right beside that diagram they have ANOTHER diagram, only difference being that the upper floor is CARPETED, and they are showing the Sonopan on the joists as you said, THEN RC, then two layers of gypsum.
Since they specify exactly which side goes where, I can only assume that this stuff is somewhat porous and would act more like insulation than like gypsum wallboard.
Note that on their wall examples, where they are using RC the RC is shown directly on the studs, then two layers of gypsum.
My conclusion is this: working around a Sonopan factory will cause you to go insane.
Since you already have the sonopan up, I'd go ahead and put up two layers of gypsum, but if you have time please call their "engineer" again and ask him why they can't make up their mind between double leaf and triple leaf construction. IF you like, have him join the site just so I can find out what can possibly be going through his mind... Steve
Then, right beside that diagram they have ANOTHER diagram, only difference being that the upper floor is CARPETED, and they are showing the Sonopan on the joists as you said, THEN RC, then two layers of gypsum.
Since they specify exactly which side goes where, I can only assume that this stuff is somewhat porous and would act more like insulation than like gypsum wallboard.
Note that on their wall examples, where they are using RC the RC is shown directly on the studs, then two layers of gypsum.
My conclusion is this: working around a Sonopan factory will cause you to go insane.
Since you already have the sonopan up, I'd go ahead and put up two layers of gypsum, but if you have time please call their "engineer" again and ask him why they can't make up their mind between double leaf and triple leaf construction. IF you like, have him join the site just so I can find out what can possibly be going through his mind... Steve
-
tenkas
- Posts: 100
- Joined: Sun Sep 28, 2003 1:55 am
- Location: Quebec, Canada
