OK, cheers Stuart. I've attached 2 latest diagrams, one for the future possible design and one for the proposed floating floor along with a description of loads etc.
Let me know if you require more.
Recording Studio / Audio Post Production Hub on level 7.
Moderators: Aaronw, kendale, John Sayers
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princeplanet
- Posts: 85
- Joined: Mon Jan 30, 2017 2:25 am
- Location: Melbourne Australia
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princeplanet
- Posts: 85
- Joined: Mon Jan 30, 2017 2:25 am
- Location: Melbourne Australia
Re: Recording Studio / Audio Post Production Hub on level 7.
OK, I've realised I should have a double wall b/n the floated room and the performer's area, so see new attached revised diagram. As well, I've attached a profile view of this double wall, particularly as it relates to the problem of containing a window on one side at 60kg/m2. Instead of 1" of glass ( 
), I'm hoping to have 2 thinner panes very near to each other for one of the window leafs. Question is: how close (without touching) can these panes be to each other without incurring any resonance issues? And do we expect a 3 leaf effect when considering the 3rd (single pane) at a distance of 100mm? Please be aware that I am mainly concerned with the sound transmission through the floor, and not so much between the floated room and the performer's area. If there was to be a frequency that would pass through the windows that was high enough to be properly attenuated by the floor(s), then I could live with it.
), I'm hoping to have 2 thinner panes very near to each other for one of the window leafs. Question is: how close (without touching) can these panes be to each other without incurring any resonance issues? And do we expect a 3 leaf effect when considering the 3rd (single pane) at a distance of 100mm? Please be aware that I am mainly concerned with the sound transmission through the floor, and not so much between the floated room and the performer's area. If there was to be a frequency that would pass through the windows that was high enough to be properly attenuated by the floor(s), then I could live with it.-
princeplanet
- Posts: 85
- Joined: Mon Jan 30, 2017 2:25 am
- Location: Melbourne Australia
Re: Recording Studio / Audio Post Production Hub on level 7.
.... With the double wall, it has been brought to my attention that the inner wall might only need to be 60 kg / m2 from the floor up to 300mm up the wall, reverting to something more like only 35 kg/ m2 from that point up. The "theory" being that the higher up the wall, the less density required.
Now, this seems to make intuitive sense (ie the greater the air gap between the wall and the floor, the less density required for the wall), but I'm sure there's science to counter that, right?
Just a reminder that I am not concerned with the transmission of sound through the walls as much as I am through the floor.
If the SE says 60 kg /m2 walls is too heavy, might it be viable to at least have the lower section of the walls be 60 kg and lighter from say 300 mm up?
Now, this seems to make intuitive sense (ie the greater the air gap between the wall and the floor, the less density required for the wall), but I'm sure there's science to counter that, right?
Just a reminder that I am not concerned with the transmission of sound through the walls as much as I am through the floor.
If the SE says 60 kg /m2 walls is too heavy, might it be viable to at least have the lower section of the walls be 60 kg and lighter from say 300 mm up?
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princeplanet
- Posts: 85
- Joined: Mon Jan 30, 2017 2:25 am
- Location: Melbourne Australia
Re: Recording Studio / Audio Post Production Hub on level 7.
... hmm... seems like I'm just talkin' to myself here... 
oh well, I'll keep going regardless.
Now it appears that I can lay it out like in the new attached file. Room on the left to be the control room, and now the entire area to the right can be studio with the 180kg/m2 floated floor. Apparently this is possible because the walls can be built upon the supporting steel beams beneath the existing 125mm concrete slab, as long as they are placed within 400mm of the centre of these beams. The only exception is the south inner leaf for the control room which will be approx 900mm away from the beam- but there is no floating floor in the control room, nor an inner leaf ceiling bearing down on the slab via the walls, which may only be 35kg/m2.
This design is in flux, it has been changing as new information comes to hand (some of it from this forum, although not so much of late sadly). So this new design has no booths (i'll use gobos instead), incorporates a 600mm gap behind the southern studio wall which can be used as as storage. Some of you will be alarmed that the control room will have only a 35kg/m2 inner leaf, and even more alarmed that ther will be no floated floor there, and positively in disbelief that there is no provision for an inner ceiling! What's the point, you say, of having an inner leaf set of walls in the control room that are coupled to both the existing slab as well as the existing ceiling!
Well, for one thing, I won't need anywhere near as much T/L through that floor, or the walls for that matter. In any event I can't afford a floated floor and inner ceiling there anyway, although I have thought that by floating the walls, and leaving a 500mm removable wall "panel" at the top of the walls in case I wanted to add an inner ceiling in future, I can "future proof" to a certain extent if the need was there to chase higher T/L. I see no reason why, some time in the future if the need also arose, I couldn't also add a floated floor within the floated walls (yes, I understand the reasons why this is not ideal and why, but it will lead to an improvement if done right).
So there you have my latest invitation for yet another public shaming. Have at it
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oh well, I'll keep going regardless.Now it appears that I can lay it out like in the new attached file. Room on the left to be the control room, and now the entire area to the right can be studio with the 180kg/m2 floated floor. Apparently this is possible because the walls can be built upon the supporting steel beams beneath the existing 125mm concrete slab, as long as they are placed within 400mm of the centre of these beams. The only exception is the south inner leaf for the control room which will be approx 900mm away from the beam- but there is no floating floor in the control room, nor an inner leaf ceiling bearing down on the slab via the walls, which may only be 35kg/m2.
This design is in flux, it has been changing as new information comes to hand (some of it from this forum, although not so much of late sadly). So this new design has no booths (i'll use gobos instead), incorporates a 600mm gap behind the southern studio wall which can be used as as storage. Some of you will be alarmed that the control room will have only a 35kg/m2 inner leaf, and even more alarmed that ther will be no floated floor there, and positively in disbelief that there is no provision for an inner ceiling! What's the point, you say, of having an inner leaf set of walls in the control room that are coupled to both the existing slab as well as the existing ceiling!
Well, for one thing, I won't need anywhere near as much T/L through that floor, or the walls for that matter. In any event I can't afford a floated floor and inner ceiling there anyway, although I have thought that by floating the walls, and leaving a 500mm removable wall "panel" at the top of the walls in case I wanted to add an inner ceiling in future, I can "future proof" to a certain extent if the need was there to chase higher T/L. I see no reason why, some time in the future if the need also arose, I couldn't also add a floated floor within the floated walls (yes, I understand the reasons why this is not ideal and why, but it will lead to an improvement if done right).
So there you have my latest invitation for yet another public shaming. Have at it
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princeplanet
- Posts: 85
- Joined: Mon Jan 30, 2017 2:25 am
- Location: Melbourne Australia
Re: Recording Studio / Audio Post Production Hub on level 7.
....just bumping before this thread disappears into the ether....