Drywall application sequence

[stickjam]

I am nearing the point of applying drywall to my project studio. I am using the RSIC-DC04's to isolate the ceiling, in conjunction with double wood stud 2x4 walls. I plan to put up one layer of 5/8" gypsum over a layer of 1/2" on both the ceiling and the walls.

Here is my question: In what order should the ceiling and wall layers be applied with a resiliently-mounted ceiling and direct-to-stud walls?

I've read some articles that advocate applying the first layer on the ceiling, then the first wall layer, maintaining a 1/4" gap which is acoustically caulked. Apply the 2nd ceiling layer with a gap to wall and caulk; then apply the 2nd wall layer with a gap to ceiling and caulk. My instincts tell me though that the additional weight of the second ceiling layer and any subsequent later settling would cause the whole ceiling to close the first caulked gap, compress upon the first wall layer and compromise the resiliency of the ceiling.

Other writings advocate putting all the wall layers up first, then all the ceiling layers, maintaining a single gap to the wall which is caulked. This is contrary to conventional construction wisdom that indicates ceiling-first construction so that the walls help support the edges of the ceiling. Doing the math indicates this per-clip load (20.9 lb/clip) is within the ratings of the RSIC (max 36 lb/clip)

What is the preferred way to do this and what are the potential pitfalls?

Thanks

--Bob

[David French]

Before you put up drywall, have you seen this stuff?

[Rod Gervais]

Before you put up drywall, have you seen this stuff?

David,

This is nice stuff - but it is not designed to take the place of drywall in an isolated structural system.

It may have it's uses after the drywall is completed - but not instead of.

It's problem (from this perspective) is that it is a frequency absorber - and an absorber makes a lousy sound isolator. It does however look like it has promise from the perspective of acoustical treatment after the sound isolation is handled.

You need mass - mass and more mass - especially for low frequency sound.

In answer to the original post - with the drywall - use a 3/8" gap - i personally like ceiling - wall - ceiling - wall - and have not had problems with settlement "coupling" the 2 assemblies.

Rod

[David French]

I admit, I didn't really read the post :oops: I was just excited to talk about this stuff since it's being installed in my university's new studios :D

[Rod Gervais]

I was just excited to talk about this stuff since it's being installed in my university's new studios :D

LOL...........

David,

Nothing to be embarassed about - sometimes the verbiage that the companies use don't really present well how their products are intended to work.

I can imagine you being excited - the product really does look impressive for the use intended........... I bet the Studios at your university are going to be great...........

[David French]

Roger Noppe designed the new facilities. Does anyone know him?

[Rod Gervais]

Roger Noppe designed the new facilities. Does anyone know him?

If you mean Roger Noppe of Purcell, Noppe & Associates - I do not know him personally - but I have heard of him.

He apparently is very respected in the field.

Rod

[David French]

Yeah, that's him.

[eric_desart]

Hi David,

Only couple of months back I used this material.
It's really expensive.
So designers/architects working on a percentage are certainly interested in this.

The main purpose of this is that you apply absorption without the look of absorption.
It just looks as a plastered wall.
But for this look you need to pay a lot.

But as Ron said: it's absorption not insulation.

Regards
Eric

[Rod Gervais]

Hi Eric,

I haven't seen you in a while - tis nice to see you again.

I hope all is well with you.

Rod