Little Green Glue Question

[john1056]

How thick is Green glue after installation when its sandwiched between two sheets of drywall? 1/8 inch? 1/16? Negligible?

Thanks!

[Ted White]

about 0.5mm

[john1056]

Thanks! That's pretty thin. I guess that being the case the first wall should be very flat. Do people typically use tape and mud, or just mud the cracks?

[Ted White]

It can accommodate a fairly irregular surface, surprisingly. A textured wall or ceiling is fine. Small popcorn is OK, but not great.

You want the seams sealed. Generally acoustic sealant, or drywall compound for small stuff.

[john1056]

No tape then? What about seams where where is a dip in the drywall for the tape?

[Ted White]

No need to worry about that recess.

[norton]

If you're talking about the outside finished surface... then yes. tape and mud is fine.

You can go the extra mile and run a bead of caulking down the mud bed first... but it's really not necessary. If the rock is installed in an acceptable fashion those seams are small enough that the only thing that's going to leak through them are very high frequencies... which are easily stopped by mud and tape.

[Ted White]

If the rock is installed in an acceptable fashion those seams are small enough that the only thing that's going to leak through them are very high frequencies... which are easily stopped by mud and tape.

Exactly. And part of the "acceptable fashion" would be to stagger the seams so the seams of the first layer do not coincide with the seams of the second layer.

This is a factor you can't get when using a single sheet of factory damped drywall.