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could we benefit from using 2 beads of neoprene sealant along the top edge of all the bearers before we put the existing floor back down and not screw this but allow the sealant to set, also use neoprene sealant between the floor and the walls so there is no mechanical connection and by this will it result in extra DE-coupling?
I'm not sure what you mean by "neoprene sealant", but the only way that MIGHT work is if you do the necessary testing and calculating, and prove that your full loaded floor will deflect the sealant just the right amount to cause it to float. That amount depends on the characteristics of the sealant itself, so you'll have to check with the manufacturer to find out what the optimum deflection is for maximum resilience, but you'll probably find that it is somewhere in the region of 10% to 20%, give or take a bit. If you can guarantee that your entire sealant beads will all deflect to the correct range when the floor is fully loaded, then that might work. However, the chances are slim: If you overload the floor such that the sealant deflects too much, then it will flank and you will not get any isolation. And if you don't load it enough, it will also flank, and you won't get any isolation. So you'll have to calculate and experiment very carefully, until you are certain that you can lay the beads accurately enough, and load the floor precisely enough, and do that all without accidentally creating any flanking paths....
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The other way we could do this is by using the neoprene striping which comes in 10m rolls at 50mm wide x 3mm thick and glue this down to the bearers before we put the floor back on.
Once again, you'd have to check with the manufacturer to find out what the correct deflection is for optimum resilience, find out what loading causes that amount of deflection, then calculate your floor loading and neoprene area just right to ensure that it really does float. Same as above; too much load flanks, and not enough load flanks.
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I know there is a lot of information on this site and one fellow said he paid to get some tests done on some material to see how much compression it took under a certain load so he could work out how to space the pads according to the weight calculated above based on compression performance,
Yes, that is indeed the correct way of going about things.
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but if we use the strip this would surely help the de-coupling without having to pay for tests. I know it would probably be a better result if we got the tests but surely it would be a help and wouldn't be a complete failure if we used neoprene stripping.
It will only work if you do the necessary calculations and load the floor suitably to get the correct deflection at all points. That means providing more pad area under heavy areas of the floor (EG, the desk, racks, sofa, chairs) and much less under non-loaded areas (open spaces where nobody ever walks). You have to take all of those into account when you do the calculations, you need to know the weight of everything, and figure out how much area of pad you need under each floor region, to cause it to float correctly. It's complex: Not for the feint of heart....
Your chances of it working out purely by sheer luck are somewhere around zero...
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It would be great if there were pads that you could buy in packs that just simply had the compression information on the pack so you could easily make the spacing calculations.
There are, but you still need to do the calculations, and that's where the problems come in...
- Stuart -