http://recforums.prosoundweb.com/index.php/t/32439/0/ (previous thread)
After all the information and all the reactions on this forum I first decided to stop with the project because of the difficulties and the limitations of the building. But after a visit from the neighbour during a recording session of a cagon I have to go on with the project.
First I spoke with the constructor of the building, he is prepared to check my final design to be shure that the building can handle the weight of the construction. He also confirmed me that it wouldn't’t be a problem to hang the ceiling to the floor of the second-floor. So that’s good news to reduce the weight J.
I will hang the ceiling with, clips like the isohangers, 2 layers of drywall, and a layer of glass-wool between the existing ceiling and the drywall.
The floating floor will be made of regufoam benches/pads. Merford calculated the amount and type of regufoam that has to be used for the weight of the construction.(I also had grate advice from Alara-Lukagro, with kidpads) There should be 1/8m2 of foam under each m2. I was wondering what would be the best way to spread the weight, long small benches or pads, on the net I see both. In this design I go for the benches cause it is easyer to work with.
The benches will be 5cm wide and 3.7 cm height, , with a layer of obs on it, the total height of this will be 3.7 cm + 1.8= 5.5 between the benches there will be a thin layer of +/- 3.5 cm rock-wool/glass-wool. On the obs I will put lewis-board, with 5 cm light concrete(1700 kg/ m3). The floor will be on whole floor, to spread the weight over a as big possible surface. There will be a gap of 5 cm around the floating floor with a layer of glass-wool.
The wall will be made of metal studs, with 2 layers of drywall and the gap between the existing wall(25 cm concrete) will be stuffed with 14 cm of glass-wool.
The
Static weight 120,45 kg m2
dynamic weight 33,34 kg m2
Total weight 153,79 kg m2
I draw some pictures of the construction in excel, I will scan them tomorrow and Will post them.
I'm looking forward to your reactions, i think that this is the best that can be done within the limitations of the building.
Best regards,
Peter