Regarding drywall installations and Green Glue:
1. Will sealing the gaps with silicon caulk (I'm using Silicon II door and window- clear) prevent or delay GG drying to its "cured" state?
Should I wait for a couple days to seal?
2. Is it redundant to caulk both layers? (I'm adding two drywall layers with GG in between) Could I do just one?
3. This silicon caulk dries very soft. Hmmm...has it ever been tried as a Green Glue equivalent (damping)? Test results?
4. Is Silicon II caulk okay to be used as an acoustic sealant like I'm using it for?
Thanks!
Questions about Green Glue and Silicon Caulk
Originally posted at johnlsayers.com, topic 9234.
1 a) No
1 b) I don't think it matters. GG has a VERY long curing time, that's not in days but weeks.
2) A lot can be said about this, but play it safe: do both. Basically edge caulking differences has mainly influence in the higher frequencies, less defining in the overall TL. But as said: play safe.
Personally I often feel that this is sometimes overrated since low frequencies are mainly defining. But it's better to do something too good than too bad.
3) Silicone is an elastic material. GG is a visco-elastic material, where the viscous part makes GG as good as it is.
Silicone as elastic material STORES energy and gives it back. The viscous part of GG ABSORPS (disipates) this energy.
The feeling soft has little to do with it.
If you feel both, you will notice that you have quite different materials in your hand. Hence comparing them for the application and functionality GG is meant for is in fact senseless when understanding the materials and how they work.
4) Seems OK, I rather like butyl but this works also (butyl is also visco elastic, but that's less important in this specific application). Butyl is more like plumbers mastic or children's clay.
PS: The difference between elastic and viscous.
When you drop a cured piece on the ground the elastic stuff will jump up again as a ball (it stored that energy and gave it back), the viscous material will drop dead on the ground (it dissipated that energy).
Thanks Eric!
I also called Ted and he further confirmed what you post here. The moisture from the green Glue "wicks up" into the drywall, and caulk around the edges in no way impedes the curing/drying process.
I see what you mean about the silicon caulk...I found out yesterday after it dried- that silicon stuff is VERY rubbery and bouncy...good for a nice seal and that's about it...