Next to one of my classrooms is a stair shaft. On the other side of this same stair is "Outside". How do I show this in the table?

The first floor of my classrooms are slab on grade which per the LEED template should have an STC of 50 because its ajacent to the outdoors (grade being the outdoors).

I'm working on a LEED-S 2007 project that is pursuing this credit but I have a question about the requirements.

For the expansion joints being used in a LEED project for schools v2009, do they have to meet the NRC requirement of 0.70? Currently our sub wants to use Seismic Colorseal, STC 52/OITC 38.

If our windows have an STC of 35 but an OITC of 25 would they qualify? I don't think so, but I don't know how to interpret or relate the OITC to STC.

I'm filling out the Table IEQc9-1 and it asks me for a STC rating for the ceiling assembly. I set the space "adjacent to assembly" to "outdoors " because it is only a 1-story building.

Just want to double check . . . As far as I can see, there are no IIC requirements in IEQc9. Can someone confirm please? Thanks.

Is the 40 dba a direct value for the equipment itself, or is it a net value based on a sound path analysis to the space?

How are the acoustical requirements for this credit treated in 'open plan' designs where several classroom 'studios' are grouped together, as in the Schools of the 21st Century design approach?