## First attempt- please respond! Thanks, friends.

Building Section Vignette and Multiple Choice

### First attempt- please respond! Thanks, friends.

I utilized the NCARB practice vignette on a 32 bit machine.

1st floor
8'4" ceiling
Largest duct size w/ 24" joist is 32x24
8" clearance for lights
Footings are 5'4" to accomdate for 4" SOG and 5' frost line

2nd floor
9'0" ceiling
Largest duct size w/ 24" joist is 24x20
8" clearance for lights

Lab
15'0" ceiling
32" joists at 5'0" o.c.
8x8 ducts (see below for question here...)
8" clearance for lights

I'm confused on the duct sizing, though. How do you calculate this? if it says 8x8 duct, and the joists are 32" @ 5'0" o.c. - it's not an 8x8 duct? I saw others modifying the sizes, and I don't know how/why...
Joists overlap bearing walls by a 2" or so...I read that's appropriate. Am I correct?
I did not break the slab at each footing/footing wall, should I?
Corridor wall rated and extended to underside of slab, partition wall non-rated and extends to 6" above ceiling
2' parapets

Let me know your thoughts, I greatly appreciate it!
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Talia303

Posts: 14
Joined: Fri May 10, 2013 6:04 am

### Re: First attempt- please respond! Thanks, friends.

Talia303 wrote:I'm confused on the duct sizing, though. How do you calculate this? if it says 8x8 duct, and the joists are 32" @ 5'0" o.c. - it's not an 8x8 duct? I saw others modifying the sizes, and I don't know how/why...

I'm not really sure what you're asking.
A) Always draw the duct cut in section. (size = WxH)
B) For interstitial space, use the largest joist/duct combination in the area with the same ceiling height.

Joists overlap bearing walls by a 2" or so...I read that's appropriate. Am I correct?

Some of yours appear to be much more. Litit it to a snap or two.

I did not break the slab at each footing/footing wall, should I?

Absolutely break slab at bearing walls.

Coach

Posts: 13235
Joined: Wed May 23, 2012 2:08 am

### Re: First attempt- please respond! Thanks, friends.

Thank you very much for your response. I'm going to work through another one today!
-Talia
Talia303

Posts: 14
Joined: Fri May 10, 2013 6:04 am