I have a kindergarten, 7440sf, ground level only, all learning spaces are on perimeter with windows. There is only a small road on the one side about 20 m away. There is no Mechanical Ventilation, just a radiant floor heating. The mechanical room is not adjacent to any learning space. All learning spaces have acoustic ceiling tiles with NRC 0.65, covering >80% of the ceiling. Ceiling height is at about 3.2 meters. The floor is laminated, and has a 8mm (3 inch) wood fiber board "Trittschalldämmung" Step absorption layer.
I've just been told we're not getting the usual acoustics calculation, because it was no longer required. This leaves me to do this on my own.
Q1) will it be accepted to do the calculation for one representative room? (there are 9 "learning" spaces)
Q2) Are other spaces, like corridors to be included?
Any other hints, suggestions and tips are appreciated. Good page btw.
Jean Marais
b.i.g. Bechtold DesignBuilder Expert832 thumbs up
August 9, 2011 - 3:37 am
Sorry, I've just checked the data sheet properly. On the data sheet for the acoustic panels it states that when the gap between hard ceiling to bottom of panel is 125 mm (yes) and the insulation is 60 mm (yes), then the NRC is 0.95. I also now under stand that the 20000 cf criteria is per room, not entire facility. that means I could use case 1, option 2. to prove my case. I just need to area weight the NRC value. for that i need a good assumption of the NRC for the normal ceiling tiles with the same ceiling depth and insulation dimensions...any ideas?
Jean Marais
b.i.g. Bechtold DesignBuilder Expert832 thumbs up
August 9, 2011 - 6:41 am
Woops! Just got the real value for the NRC of the normal tiles from the manufacturer...0.05. Ouch!
Jean Marais
b.i.g. Bechtold DesignBuilder Expert832 thumbs up
August 9, 2011 - 8:51 am
If the NRC compliant area does not cover the ceiling area for spaces < 20,000 cf, can one try with calculations which include walls, floors, windows, etc. to prove RT are compliant?
Jean Marais
b.i.g. Bechtold DesignBuilder Expert832 thumbs up
August 10, 2011 - 5:57 am
Yes, you can with ANSI S12.60-2002.
Daniel Hicks
Daniel Hicks, E.I., INCEGeiler & Associates
267 thumbs up
September 30, 2011 - 12:07 pm
Hi Jean:
Sorry for the late response.
Yes, you can do individual calculations for reverberation time in each space instead of designing the ceiling area square footage of NRC 0.7.
I would do a calculation for each space unless they are identical.