Correct:a. Angled Windows do not provide better soundproof. Maybe even worse because of the air space loss.
Incorrect, and irrelevant anyway. The small angle that you could conceivably put on the glass would have no appreciable effect on modal response inside the cavity, and even if it did do something useful, the frequencies where it would happen are high enough to not be of much concern.b. Angled windows help with standing waves inside the window. If true how will these affect perfomance of the window?
Correct, and this is the only valid reason why you might want to angle the glass on the control room side of the window: to avoid light glare in the glass. Or you could just place your light sources carefully, to minimize light glare....c. Angled windows will help with light reflection and sound reflections (this would be good to reflect to the ceiling since I´m planing to have absorbing panels there)
You are correct: That would be a 4-leaf system. Potentially, the low frequency isolation would be worse than the equivalent two-leaf system.2. My provider suggest two double glass leaf but each double window with a glass separator of 12mm. So from what I understand this would be like a 4 leaf system...
You are correct, yes.From what I have learned in this forum, those 12mm airgaps are not desirable and we should obtain better soundproofing by eliminating 12mm airgaps and by that having two 15mm glass leafs and a single 20 cm airgap... Am I correct?
While it is true that having different thicknesses of glass can move the coincidence dips so that the don't line up exactly, in reality you would nee an enormous difference in thickness to obtain any useful result. The coincidence dip is very broad for typical glass, so moving it a bit up or down the scale doesn't make a lot of difference, as it still mostly lines up with the dip for the other pane. What makes a MUCH bigger effect, is to use laminated glass in both panes, and even better is if the laminated glass uses an acoustic PVB interlayer, instead of the ordinary PVB interlayer.a. I have read that one must have different glass thickness... How much difference is desire? In my case we have two equal glasses (2x 15mm). The only difference is one of them is laminated. Is this enough of a difference?
Yes:b. Since I have one leaf laminated and the other not... Is it preferable to have both leaves laminated?
Make the air gap as big as you can get it, ideally 1.4 times the size of the air gap in the leaf itself. If you can't get 1.4 times the depth, then increase the mass of one or both glass panes.. If you do need to angle one pane for light glare, the increase the gap more, or increase the mass more.4. How valuable is airspace for my window soundproof? Should I sacrifice space for inclination or otherwise? I think my priority is soundproofing but maybe I´m not too consciuos of the importance of the other issues not managed by having two paralel vertical glazes.
Do you really need 2x6 studs for your inner-leaf? Normally code only requires 2x6 if your walls are load-bearing and taller than 12 feet. Going with 2x4 would save you a lot of money.5. My wall leafs if brickwall 15cm thick and a triple 5/8 gypsum attached to 2x6 filled with 6 inches of 3lbs mineral wool and a 10 cm aispace between studs and brickwall...
Exactly, and you do not need to do that. Just do the math to make sure that you will still get the level of isolation that you need, and that your isolation covers the range of frequencies where you need it.Total wall widht is about 40cm. It seems that matching the density of a brickwall with glass is almost impossible,
Not even in world-class studios. I haven't heard of many studios that have 15cm thick glass in their windows! Any more than about 3cm is overkill.i think this is only practical for worldclass studios.
Did you do the math to check that? What isolation does it give you, and does the frequency profile match the frequencies that you need to isolate? Also, do you really need triple lamination? That's expensive! It would be better to go with something like 10mm + 6mm, rather than 6+3+6. Triple lamination is very expensive.However, what are your thoughts on 6+3(laminated)+6 (total 15 mm laminated) for the brickwall side which will be the live room side and the control room will be a 9+6 mm.
Do the math!Since I know this is too dificult I´m planning on compensate with airgap... That´s the reason for my 40 cm wall... Is there any trick to improve soundproofing of a window whem you have a limit of thickness? or, do you recommend any glass thickness? It would be great to be able to record drums
Check that your proposed system is going to give you the isolation level that you need, and is going to cover the frequency range that you need to isolate.That's not very thick...6. My provider tend to offer me for example 6mm+3mm glass for a total of 9mm glass.
Here's something I found out a while ago: Go to a local furniture store that sells furniture made with glass: glass coffee tables, for example, or glass dining tables, or glass desks. You will find that the glass they use for that is usually laminated, and is usually a lot cheaper than buying custom glass from a supplier. The glass used in furniture isn't quite as good quality, and might have slight imperfections in it, but the price is good! The only issue is that you cannot cut laminate glass, so you will have to adapt your windows to whatever size and shape of glass you can find. Still, you can get very thick glass like that, and save money.Thank u very much for all your help.
Another option is to look for a bank that is closing down, and buy their bullet-proof glass teller windows. Those things are incredibly thick, usually multi-layer, and you can sometimes get them cheap, or even at no cost if the demolition company is not trying to recycle or resell the building materials.
There are options like these that an save you money, if you think about it....
- Stuart -