ARE CDS Vignette

Building Section Vignette and Multiple Choice

ARE CDS Vignette

Postby Tortilla » Sat Feb 03, 2018 3:57 pm

I'm looking or clarification on the maximum duct size issue. My understanding is that my plenum needs to be drawn to include the maximum duct size in the "area', which interpret to mean that particular floor and side of the building? in other words, the maximum duct size for all parts of that floor where ceiling heights align and ducts are continuous.
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Re: ARE CDS Vignette

Postby Coach » Sat Feb 03, 2018 10:13 pm

You don't necessarily use maximum duct size.

Plenum is sized for the largest joist/duct combination. That combination might or might not include the largest joist or duct.

For this purpose, an area is all space on the same floor with the same ceiling height.

viewtopic.php?f=10&t=51542&hilit=joist%2Fduct
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Re: ARE CDS Vignette

Postby Tortilla » Sun Apr 29, 2018 8:05 pm

Hi Coach,

Would you mid taking a look at this practice exam -- given our conversation about plenum and joist - duct combination?

Plenum depth:

- 32" floor 1 remaining area (outside lab)
- 24" floor 2 lab
- 32 floor 3 remaining area (outside lab)
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Re: ARE CDS Vignette

Postby Tortilla » Sun Apr 29, 2018 8:07 pm

And 2 more images...
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Re: ARE CDS Vignette

Postby Coach » Sun Apr 29, 2018 8:53 pm

To really get a handle on the joist/duct combination, do the 3.1 vignette.
It looks like your light spaces are inadequate.
Rated walls go from top of slab to bottom of deck.
Break slab at bearing walls.
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Re: ARE CDS Vignette

Postby Tortilla » Sat Jun 16, 2018 2:00 pm

Hi Coach,

Could you elaborate briefly on your last comments on 4/29:

- Regarding inadequate light spaces?

- If by "breaking slab" art bearing walls you mean the bearing walls sit directly on the footings -- I believe I did that, unless you are referring to the center footing?

- Rated walls are shown as brown, going from top of slab, past rafters, to bottom of deck.

Lastly, can you tell me where I can find the 3.1 practice vignette?
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Re: ARE CDS Vignette

Postby Coach » Sat Jun 16, 2018 2:39 pm

Tortilla wrote:- Regarding inadequate light spaces?

At some locations it didn't look like the required 8" was provided.

- If by "breaking slab" art bearing walls you mean the bearing walls sit directly on the footings

Yes.

-- I believe I did that, unless you are referring to the center footing?

Interior bearing walls count too.

- Rated walls are shown as brown, going from top of slab, past rafters, to bottom of deck.

They should do that at each floor. In the image it looks like it runs continuous from first floor to roof deck.

Lastly, can you tell me where I can find the 3.1 practice vignette?

viewtopic.php?f=10&t=13589

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Re: ARE CDS Vignette

Postby Tortilla » Mon Jun 25, 2018 8:48 am

Thank you Coach -- very helpful.
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Re: ARE CDS Vignette

Postby Tortilla » Mon Jun 25, 2018 8:59 am

Question: For the 4.0 CDS Vignette, is the largest duct/joist combination tied to the room or the floor. In other words, is the assumption there are no ceiling height changes by room or across the entire floor of the building?
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Re: ARE CDS Vignette

Postby thd7t » Mon Jun 25, 2018 10:02 am

Tortilla wrote:Question: For the 4.0 CDS Vignette, is the largest duct/joist combination tied to the room or the floor. In other words, is the assumption there are no ceiling height changes by room or across the entire floor of the building?

The ceiling height is uniform across the entire floor unless otherwise noted.
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Re: ARE CDS Vignette

Postby Tortilla » Wed Jun 27, 2018 5:18 pm

Hi Coach,

Posting my revised Vignette -- your feedback is greatly appreciated -- I test on Saturday:

- I have maximum duct size for the floor 1 ceiling as 32x24

- I have maximum duct size in laboratory ceiling as 24x20

- I have maximum duct size for the remaining (outside laboratory) floor 2 ceiling as 32x20
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Last edited by Tortilla on Wed Jun 27, 2018 5:48 pm, edited 1 time in total.
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Re: ARE CDS Vignette

Postby thd7t » Thu Jun 28, 2018 5:11 am

I believe that you missed your slab on grade. This is a critical error.
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Re: ARE CDS Vignette

Postby Tortilla » Thu Jun 28, 2018 2:43 pm

It was accidentally erased -- That's embarrassing. Aside from that -- good?
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Re: ARE CDS Vignette

Postby Tortilla » Fri Jun 29, 2018 3:31 pm

Final Vignette prior to exam:

- I have maximum duct size for the floor 1 ceiling as 32x24

- I have maximum duct size in laboratory ceiling as 24x20

- I have maximum duct size for the remaining (outside laboratory) floor 2 ceiling as 32x20

Thank you!
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