Simple structural support question..

[Paulkent]

Having looked at the designs on http://www.johnlsayers.com/HR/index1.htm I'm left wondering...

1) What is holding the Insulation in place.. ie.. Is anything else other than the rigidity of the sound insulation neccesary to keep it in place..

Assumption
That the position of the insulation is important and therefore should remain the same.. to maintain air gap.

2) with the studded wall designs (no link, but there are plenty of images around) I can't see from any of the diagrams how it all stays up. Do the Studs themselves support the weight of the wall.. Is sitting on the floor/floating floor the only way it is connected to the room?

Assumption
It is essential that the walls be as decoupled/removed from the actual building structure as far as possible as this will otherwise lead to degraded TL.

Forgive my 'newbieness' but I prefer to understand the theory fully. I think that's much more valuable than simply reading and building.

Paul

[knightfly]

Paul, I'm a bit short on time right now - for your first Q, try a search (this site) on "impaling" -

For the second, check here

http://www.johnlsayers.com/phpBB2/viewt ... =7526#7526

I'll be back in play probably later tonite, let me know what else you need... Steve

[Paulkent]

Ok, I think I understand the first question now..

As to the second, it seems like (to me, from looking at the drawings) Resilient channels are bent bits of steel that connect the walls...

I'm not sure I fully understand yet though.. In regards to resilient channel, how is it actually attached?

what I mean is, lets presume you are attaching a bit of gypsum to a ceiling (it's just an example) you screw the resilient channel on to the ceiling.. then.... how do you attach it to the gypsum. If you use a screw from the other side you have just defeated the Isolation benefits by directly connecting the inside leaf to the resilient channel..

If you screw the Gypsum first, you can't access the wall to utilize it.

Is the solution to directly connect a first leaf to the resilient channel. Then connect the following layers to the first by Screws in different places? Therefore gradually decreasing connectivity?

- PS I tried to post an image, but it doesn't seem to be working.. does it have to be on the web somewhere? or can I upload it straight onto this forum?

[knightfly]

If you download the USG manual in its entirety (last item in the REFERENCE area at the top of the construction forum) there are pix - search that document for "resilient", there aren't that many places so it'll come up pretty soon -

posting pix - less than 150K, less than 800 pixels wide, JPG is the best format for most - just click the browse button below the text box while posting, then navigate to the pic on your hard drive, double click the file, and then submit as usual -

Nearly late for work, give it a shot and I'll check back in about 15 hours... Steve

[giles117]

The Rc is attached to your studs (or joists)

The gypsum is attached to the RC. This whole process keesp the gypsum from direct contact with the Stud. Every product has it's own resonance frequencies and freq's that they pass readiy. You are basivally changing the mode of sound transmission when you attach the Gypsum to RC instead of the studs.

Not perfect but effective.

Of course your ceiling is stuffed with some kind of insulation to help dampen noiuse transmission as well. Ideally your ceiling should be an isolated structure not attached to the floor above.

Hoep that helps

[Aaronw]

I just did this in the control w/ RC. Here's the pix w/ RC and the first layer of drywall...

http://johnlsayers.com/phpBB2/viewtopic ... &start=259

Aaron