This book miroslav...
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OK...I have that book...that's on page 87...and it's a specialized isolation product for use on extremely long or tall walls.
In the previous sections of the book where wall assemblies are covered, to include double walls...there is no mention of the need for anti-sway bracing of that type.
It's only in unique cases where it can be added if needed, but not as a default requirement of all double wall assemblies.
I think it also applies more to complete "floating" wall systems that don't have anchor points...in which case the anti-sway would be necessary.
The other thing about much of what is outlined in the book, is that it applies very often to studios where you have other, non-studio rooms next to your studio or above or below it. So in those cases, the isolation and double walls and decoupling...all becomes much more complex, especially when building the studio inside an existing structure, like your house or some condo/apartment scenario...or in a commercial building complex.
My studio is, for all intents and purposes...a standalone structure, on it's own slab. Yes, There is a connecting foyer to the rest of the house...but there is minimal direct transmission, and I'm not really concerned about any transmission of sound into the rest of the house. Yeah, minimize it for sure, but my main/only concern is the transmission of sound out to the neighboring houses...which are not really even right next to my studio space.
I've gone all these years in my current studio, which is really just a spare bedroom type space, with 3 huge 6' wide windows...and while I do have some acoustic treatment, I have never bothered with any soundproofing treatment...and I've played my guitars cranked at 3AM..and had drummers banging away up until midnight a few times.
No one ever complained. My house is kinda set back, and I've got quite a lot of trees in back on to my sides...so all this shit I'm doing with the new studio is probably overkill...but since the new studio will be on the opposite side of the house...it's a little bit closer to one of my neighbors than my current studio...and I just want to be sure that I can still crank that guitar amp at 3AM and not piss anyone off.
Not to mention...when the studio build is done...I will most likely add another layer onto the inner drywall...probably some kind of 3/4" wood treatment.
So it will be pretty damn isolated inside.
Yes...there will be a few minor challenges/considerations when we get to the inner walls...plus the plumbing for the baseboard heat, and the ducts for the AC...etc...but it can all be dealt with and treated to a good degree with one type of another of insulating products.
So it's that 5% here and 10% there of soundproofing improvement...but I'm pretty confident that when done, it will be a very quiet room (to the outside word, and vice-versa).
Biggest thing for me was that the contractor and I suddenly ended up at what is the better solution, and it all happened in like 5-10 minutes of discussion...whereas I've been mentally struggling a bit with the clips/hat channels technique, since it had both good and bad qualities to it.
Now, the build became much more straightforward for the contractor, and it will have better results for me.