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Originally Posted by bob katz  Probably not. You have to have a survey of the outside noise. If you are on a cul de sac and very few cars pass by during the day you might get away with that, but it is unlikely if you are doing recording in that garage. You probably need double walls, a double door, and an isolation corridor with the door on the outside wall. At that point, an outside door with 41 STC in a wall with much higher isolation, followed by an air gap and another isolating wall with another 41 STC door and now you're talking!
In addition, STC rating is highly deceptive, significant low frequency noise gets through. It's impossible to make satisfactory isolation for a recording studio with a single door to the outside.
If you are NOT doing recording in there, and if the street is not noisy, then you may tolerate the occasional truck going by outside, which you will clearly here through that single door you are proposing. |
Good point from Bob : standard STC wall or door rating is just not enough for studio acoustics -- you need to look at transmission loss (TL) in 31 to 8000Hz octave bands.
You also need to look at the entire room as a whole and not just one piece of it. If your walls are single layer on wooden stud and expensive garage door with STC >50dB will be agreat expense to have low transmission loss walls. Very marginal improvements.
If you really consider a studio room in your garage : look at the entire place ceiling walls, windows and doors and consider TL ~60dB for decent playback conditions in order to get yourself a certain quality of silence.
Already reaching NC=25-30dBA in those conditions with revised HVAC (for low noise) will be challenging and expense higher than a single garage door.
Both level of background noise and interior room acoustics is a considerable investment to consider -- if you want to achieve a certain level of result.
Knowing your end target would make it easier to answer your true questions.