John Sayers' Recording Studio Design Forum Archive

OK, I have been diligently caulking every seam, crack, and nail hole in my studio. Good for me right?
But I'm wondering... is it really necessary?

I mean think about this:
Do I need to caulk each and every nail that protrudes through the roof from the shingles? That's a load of nails! And I seriously doubt you could cover every one of them!
And what about the vents on the eaves? That's one big ass hole, and I guarantee you, its not getting caulked closed!

Now, when I set the eave vents, I did it so that none were in the live room, and none were in the CR.
But that's still a big ol' penetration right through the wall into the attic.

Seems to me, that the entire integrity of the wall system, and its related STC is dependent on the INTERIOR wall, and its construction.

Where am I wrong?

Case in point:

You're not wrong - heavy inner leaf and substantial insulation above - the insulation will minimise the flanking caused by the nails in your picture, and the heavier inner leaf does the rest (of course, the caulking WILL make a big difference on that INNER leaf.

I've always thought that conventional construction, ventilation, and sound proofing were totally at cross-purposes where ceilings were concerned - I'm kinda thinking that maybe a vented outer roof and THEN a double-leaf inner ceiling would be more effective.

I plan to circumvent the whole thing by using concrete shell even for the roof, so 6" steel studs/RC inside that with 2-3 layers of wallboard and I'm done with outside walls/ceiling. Outside that, vented steel siding/roofing most likely. Gotta find more about moisture problems/cures first.

If you put more than two layers of wallboard on your inner RC, I think you may need to space the RC closer. I vaguely remember Eric mentioning that you needed to maintain the "spring rate" or something like that - so the heavier the inner ceiling leaf, the closer the RC. You'd also want longer Type W screws holding the RC to the joists with more layers - maybe 1-1/2 to 1-3/4" -

Beyond that, need sleep... That's not surprise, it's a yawn... Steve