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Natural Science Forum / Physics / Acoustics / June 2006Hotel Banquet Hall with Guest Rooms Above
We have been called by a new hotel with guest rooms directly over a banquet hall. 4" concrete floor and dropped ceiling only thing intervening. Of course, when there is a band playing, they can't rent the rooms. CMU construction on banquet level and metal stud construction above. The whole wing vibrates with our sound source on. Field measured STC is about 59 from banquet hall to rooms above. No duct chases to worry about. If we rebuild the banquet hall with well-isolated walls and ceiling with double sheetrock, do we stand a prayer making the rooms above useable? We do have room above the dropped ceiling to add a new suspended sheet rock layer and put the dropped ceiling back in about the same place. Walls would all have to be torn out and redone with something like ISOMax clips. Big problem is that supply ductwork is up high between the steel beams and we would have supply air penetrations into the space. Might need a silencer on each supply diffuser. Before we do alot of calculations, I thought I would see if anyone has been through this exercise and if it worked. Mark Bagdon Much depends on just how good a result the hotel feels they need to rent the rooms. The distinctive nature of music makes it noticeable and distracting even at low levels. I expect it would be audible to some extent in the rooms directly above whatever you do, though much would depend on the available masking sound in those rooms. I would expect that it could currently be heard at low levels even another floor up or in areas not directly over the banquet room. If that is the case and the hotel finds those areas acceptable, then that provides an idea of what needs to be accomplished. If the criteria is that the music be completely inaudible, that will be tough without good masking sound. > We have been called by a new hotel with guest rooms directly over a > banquet hall. 4" concrete floor and dropped ceiling only thing [quoted text clipped - 17 lines] > > Mark Bagdon Things can get worse ~ bedroom over nightclub ~ 100dB(lin) at 63Hz; 105dB(Lin) at 125 to 500Hz. Must be inaudible in bedroom or else the nightclub gets closed. Current floor ceiling construction tongue & groove floorboards over wooden bearers with solidly fixed double sheetrock ceiling. Ceiling height below can not be reduced. The structural engineer wants to start pouring concrete between the bearers immediately. The building owner wants to be renting out his "5 star" bedrooms in about a months time, without loosing the nightclub. > Much depends on just how good a result the hotel feels they need to rent the > rooms. The distinctive nature of music makes it noticeable and distracting [quoted text clipped - 6 lines] > accomplished. If the criteria is that the music be completely inaudible, > that will be tough without good masking sound. >>We have been called by a new hotel with guest rooms directly over a >>banquet hall. 4" concrete floor and dropped ceiling only thing [quoted text clipped - 17 lines] >> >>Mark Bagdon Brain: Good luck with that one. Be sure to let us know what you come up with. We have a similar problem at an old mill building. Mark B > Things can get worse ~ bedroom over nightclub ~ 100dB(lin) at 63Hz; > 105dB(Lin) at 125 to 500Hz. Must be inaudible in bedroom or else the [quoted text clipped - 40 lines] > >> > >>Mark Bagdon Brain: Good luck with that one. Be sure to let us know what you come up with. We have a similar problem at an old mill building. Mark B > Things can get worse ~ bedroom over nightclub ~ 100dB(lin) at 63Hz; > 105dB(Lin) at 125 to 500Hz. Must be inaudible in bedroom or else the [quoted text clipped - 40 lines] > >> > >>Mark Bagdon >>>>We have been called by a new hotel with guest rooms directly over a >>>>banquet hall. 4" concrete floor and dropped ceiling only thing [quoted text clipped - 3 lines] >>>>Field measured STC is about 59 from banquet hall to rooms above. No >>>>duct chases to worry about. To start with, I advise buulding owners to turn down prospective leesees that want to run a music bar. Man can make amplifiers and speakers that will create noise loudness that no structure can completely stop the sound from being heard in attached rooms. I make no guarantees if they want to proceed anyway. The only person fit to live over a music bar is its owner-operator (he/she will not want to sleep when the bar is open). Angelo Campanella Thanks Noral. Your observations are always useful. For a non-sturctural solution, I am suggesting that they install on demand satellite radio in the problem rooms and only rent them to guests of the banquet hall functions - at a reduced cost. Mark B > Much depends on just how good a result the hotel feels they need to rent the > rooms. The distinctive nature of music makes it noticeable and distracting [quoted text clipped - 27 lines] > > > > Mark Bagdon |
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