by archive » Tue Feb 10, 2004 5:28 am
From: "Patrick D. Olguin" <drpat@p...>
Date: Tue Aug 28, 1956 12:20 pm
Subject: Re: soundproofing
Dan Nelson wrote:
>
> From: Dan Nelson <dprimary@e...>
>
> "Patrick D. Olguin" wrote:
>
> >
> >
> > Although I'm not an expert at this by any stretch of the imagination,
> > it's always been my experience that a noise survey of the exterior of
> > the structure is the first place to start. I've seen this done several
> > ways, most involving periodic level checks (say, every minute or so)
> > over a 24 hour period at various frequencies. Once the maximum levels of
> > ambient noise are determined, it is then a question of your target noise
> > level that you desire internally. I've seen figures such as below 20dbA
> > as being acceptable. This will usually give you a good idea of
> > transmission loss that you will need. In other words, if the ambient
> > noise level measures 70dbA and you're going for a preferred noise
> > criteria of 15dbA, a target transmission loss of 55dbA is required.
> > Like I said, I'm not an expert. Am I on target...anybody???
>
> Yes, that is the the way to do for the noise coming into the studio, and for
> voice over and foley work it is the most important. But if you record rock
> bands its the noise leaving the studio that your neighbors care about. It
> sounds like you are building a free standing building which is the best
> situation too build a studio. But many people lease space in corporate parks
> and share at least one wall with a neighbor it can be very difficult to get
> enough soundproofing to keep them happy.
Yes, we will be recording live music...exclusively, and I'm actually
buying a commercial condo with only 1 common wall. It's 4100sf w/ 20'
high cielings. We're putting the studio and the control room opposite
the common wall with offices, rooms and a long hallway between them.
>
> >
> >
> > We are about to build into a structure with 8" concrete exterior walls
> > with a slab floor. We intend to float the control room floor and build
> > the interior walls on top of the floating floor. We also have tons of
>
> Pouring the exterior wall foundation and slab as separate pieces may be
> something to look into, it will help to decouple the inside floor from the
> walls.
Maybe I could have worded that better. The existing structure has 8"
concrete exterior walls and we will be floating a wood structure inside
of that.
> >
> > I'd be interested in seeing feedback posted on sources for materials
> > such as felt or rubber for floating floors. I'm also curious about
> > trough construction in floating floors. More specifically, we want to
> > build "lay in" style troughs (as opposed to pull style) in the control
> > room floor to make it easier to change cable configurations in the
> > future. Also, good trough sizes (we're building a room with two 24-track
> > machines and about 76 channels of outboard gear) and trough routing. Any
> > feedback is appreciated.
> >
> > Pat Olguin
>
> To float my last control room I ordered the rubber from McMaster Carr
> industrial supply,. I calculated the weight of the walls to give a psi load
> and then picked a rubber density that would give me about a 20% deflection at
> the load.
Did you lay a continuous sheet across the whole area of the floor, or
did you only treat particular sections? How much did this cost you?
> I might have some old drawings for a trough, I think we let each section of
> floor float independent it was about 14" wide and 6" deep. It was bigger than
> it need to be. 12" wide by 3" should be enough.
If you can post that on your site that would be helpful.
> How thick will your floor be?
We plan on building it with 3/4" plywood subfloor over 2x4 joists (kiln
dried sand filled) on top of a rubber or felt isolator. I haven't heard
of any good reasons to build it any thicker. Are there any advatages to
building a thicker floor???
>
> We decided the routing by tape outlines on the floor of the console and
> outboard racks.
Good idea, thanks.
>
> Dan Nelson
> studiotips.com