Flanking of a (big) shared concrete bed

Hi there, This is my first post so apologies if I miss some of the etiquette, or err at all! Do just let me know and I'll try to amend or give additional info. I'm planning to [self] build a new studio, have a small degree of financial backing to cover materials and would like to do things properly! Currently in the planning stage and financial forecasting of build work. I've opportunity to lease a section of a warehouse space that's being converted into a cinema/music venue/workshops etc. (in fact the leasing of space is almost guaranteed, what with a great offer for rent, length of term and synergy between organisations). We'd lease 200sqm at the far end of a slab approx 700sqm in size (as per picture below). The end section I'd be leasing is already separated off by 40cm thick load bearing wall. My query comes from the fact that the rest of the space is to become, amongst other things, a music venue. The organisation, through discussions with the council and a regional acoustics firm will be ensuring the bleed from the venue does not exceed required planning levels (10db below ambient level i think), and have a good deal of funds to contain air bourn sound within the venue space they build. It'll be a 250cap venue and so could expect to use probably a 6-10k rig max for amplification within the space. This amplification would be sat directly on the bed. My query is whether we could expect to experience any audible amount of flanking from the venue PA on the shared concrete bed, if the PA would theoretically have enough energy to excite such a large slab? I should add the slab is sat directly on earth. In general it is whether this would give rise to the need to install a floating floor to decouple our acoustic spaces from the bed... I started this process assuming that we would indeed need to put in floating floors, but I read this on the "Is a Floating Floor Right For You? Answer: Probably NOT." thread

If your slab is of good quality and suitable for construction, then you should be able to build on it without much risk of the slab being a significant transmission (flanking) path of structure-borne noise.

But I don't know if that refers to a slab that is already decoupled with neighbouring large noise making spaces.... Obviously the financial savings are significant if we don't need to explore floating any floors, so feedback from experienced bods at this stage would be greatly appreciated. thanks in advance

blankstudios wrote:

If your slab is of good quality and suitable for construction, then you should be able to build on it without much risk of the slab being a significant transmission (flanking) path of structure-borne noise.

But I don't know if that refers to a slab that is already decoupled with neighbouring large noise making spaces.... Obviously the financial savings are significant if we don't need to explore floating any floors, so feedback from experienced bods at this stage would be greatly appreciated. thanks in advance

Yes, this is talking about one environment that a user might be considering for the project. The question is, how much cash are you willing to throw at this issue? In a rent/lease situation you are talking about throwing money at something that you will never get back, with a floated floor. Still if you actually had the money and could get engineering approval for a floated floor it might be an option....if you had the money and could get the approval from all parties involved. An option might be to advance the thought on having the slab cut to have the path from the offending area broken. I would take this over the floated floor but you still need approval and deep pockets. I think what you need at this moment is to get testing done to determine what and how much flanking exists in the slab in relation to where you are. The air borne noise can be dealt with but the flanking in a concrete slab with metal in it can make as much noise with the beating of a hammer, from the start to the end fifty feet away.