2 x 4 stud wall - on false floor or original floor?

[audiothings]

should i put my 2 x 4 studs for the three layers of drywall on the structural floor or on the floated 6" high sand and insulation filled (floating) floor?

thanks,

[jhbrandt]

Normally when floating a room, you will build the inner walls and ceiling on the floating floor.

What is your sand-filled floor on?

[audiothings]

thanks.

What is your sand-filled floor on?

ceramic tiles. 5th floor in a high rise office complex.

i was thinking... 1" of neoprene rubber on the tiles on which there will be 2 x 5 wooden frame. On the tiles is 4" of sand followed by 2" of OC703 (or equivalent). 2 x 19mm plywood on top of the frame on which we will put the decorative wood floor.

The ceiling is over 12' high and all around me there are offices which have fitted seriously heavy mezzanines to create more space. So i'm pretty sure that the building can take the load.

(option of pouring concrete is non existent).

any better way to do it within the costs of the described process?

on a related note... of course there will be 4" of insulation filling the studs, but what if i put the 3 layers of drywall on the outside? i.e. the drywall, on the studs will be facing outside, and the insulation will be facing the isolated room... will i be losing significant isolation going this way? the reason i'm asking is that the insulation, i hope, in this case will help with both isolation and with deadening the room...

thanks again,


EDIT: I read the following post. Pretty scary.

Is a Floating floor right for you? Probably not.

But ten years ago, I "floated" the floor of my current iso room with even less than the minimal knowledge I have now, and I can say with certainty that it is significantly more isolated from structural sounds than my control room, which is not floated.

I know that answers to my questions are already out here somewhere, but I get so distracted and off track when scanning a bunch of messages not directly connected to the particular situation i'm trying to address... I start reading about all types of related issues and don't get down to particular answers. So please keep 'em coming.

[Richie]

There are engineered solutions to your problem, and although you describe a solution that will work, it seems a bit over blown and heavy. The sand would weigh almost as much as the concrete and I wouldn't want to be on the floor below. Try Mason Industries in the US for floor isolation systems and get a building engineer to do the numbers on the load and frequencies you need to attenuate. Then you can build a floor/wall system that will work well and cost less. Being on the fifth floor is an advantage as far as isolation is concerned as truck/train traffic is felt less at that height, although it may still be there. The fiberglass in the floor is a waste, use a layers of MDF in the floor and you won't have a resonant structure. The walls always go on the floor in a floating system if your goal is sound and vibration isolation. If you are trying to isolate machinery, it's a toss up, If your goal in floating the floor is resilience, such as for dancers or boxers, walls go outside the float area.

[masterstroke]

Try polyurethane spray for insulating floor.I have applied,Many company providing polyurethane polyurea spray for insulation e.g ultimate linings etc.