Inner ceiling question

We are in the middle of building a studio and a question has popped up so I'm hoping someone here has some advice: Long story short. The studio is built in Sweden but I live in Portugal. Therefore I haven't been able to attend through the whole process, and the thing that I am now worried about could surely have been avoided had I been here to watch over the building. Ok, the ceiling beams (sorry if my terminology is a bit off through this whole thing) are resting on the wall structure in the rooms. Attached to the beams are wood planks, 21x70mm. What we are going to do now is to attach 3 layers of gypsum boards (same as in the walls) to these planks. HERE IS MY CONCERN: insulation has been rolled out on top of the planks, which means that the insulation is kind of floating 21mm above gypsum boards. What worries me is that the insulation is not in direct contact with the gypsum boards, and as far as I know, this means that there is nothing to pick up the resonance from the boards! Is this a cause of concern or have I just misunderstood the whole concept? According to my dad, who came up with this solution somehow, this is kind of "the way it's done", but something seems fishy to me. We have one kind of emergency solution that we might try if needed. We have a lot of high-density inner ceiling boards, the kind of boards that you find if offices and such, about 50x50cm I think. We could cut these and slide them in on top of the gypsum boards between the plans so that they are resting directly on the boards. Would this be necessary, or will it just be a waste of material?

from what I understand of your post details - You are asking about "strapping" as it's termed in the US. Basically strips of wood that run perpendicular to the ceiling joists (your term was beam). Your dad is right in terms of construction - drywall/gypsum is hung on these strips when setting up a ceiling. Now to apply this to isolation - This is the same thing as using furring strip/hat channel to attach to the drywall/gypsum. This is what I have done for one section of my room. The insulation does brush up against the actual ceiling in spots, but that is because it's over stuffed (slightly OC R-30 in 2x10'' joist). I think what has been done is unnecissary because the ceiling frame is already independantly framed (resting on the wall headers...). If you want to rule all of this out - pull it all down. It's only strapping. It'd be easier if it were screwed in instead of nailed. If you wanted to let your situation remain - I am of the marginally experienced opinion that since you have a soft side facing the drywall/gypsum layers - the resonance will be defused when it hits the bats of insulation. I thought resonance occurred most when two sides of the inside in a wall were able to reflect. Someone may articulate this in a better way, but this is how I see things. I suspect that the measures you'd take to put the rigid fiber board in there would be costly in effort with little payoff. Whoever put these up is simply thinking - I have to put insulation up there. I need a way for it to stay up there. this strapping will do that for me.

from a normal construction standpoint, it might be that leaving a gap is ok, from an acoustic standpoint, you're better off having the insulation in contact with the drywall to provide a dampening effect and leaving the air gap above the insulation. so if its possible to get the insulation down onto the drywall, i think you'll be better off.