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Old 02-20-2008, 03:44 PM   #16
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Which is better? (Non-vented roof construction with indoor pool)


Thank you, Ed.

NC,
I'm in the foothills of the Bighorn Mountains, north--central WY, 4400', high desert (only 9" of rain last year), into 100s in summer and this winter was unordinarily harsh reaching -50.
I read the info on buildingsciences.com that explains much lower indoor relative humidity is needed in the winter. We *are* working with a specialist to design a humidity control system for the pool room, but want to make sure we take every precaution with the building (roof), as well.
Not sure what you mean by "hygrothemal analysis on your system using WUFI"--that's greek to me so I'll web search it and follow up.
Thank you.

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Old 02-20-2008, 04:03 PM   #17
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Which is better? (Non-vented roof construction with indoor pool)


good lord that is one heck of a temperature swing. WUFI is a software developed in germany and is sponsered in the states by oak ridge. Its a great tool but can take quite a bit of time to make use of. Its simple to use and complex to understand if that makes any sense. There is a free version available but it doesn't have some of the bells and whistles the full version we have here at work does.

http://web.ornl.gov/sci/btc/apps/moisture/

Would be interesting to see what you decide. We have a project right now which is going to have an indoor pool on the 17th floor. Somehow I'm sure it will be a problem later down the road.
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Old 02-20-2008, 04:40 PM   #18
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Which is better? (Non-vented roof construction with indoor pool)


17th floor, Wow!
Thanks for the link. Found some stuff here http://www.ibpsa.org/ too. Doesn't quite look like DYI, but far more helpful than what I've dug up so far.

The funny thing is people keep telling me I don't need to worry about humidity because its so dry here. When in reality, humidity from the pool room will naturally want to go into the dry living spaces. And I'll actually have *more* evaporation from the pool surface with such dry air.
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Old 02-20-2008, 04:48 PM   #19
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Which is better? (Non-vented roof construction with indoor pool)


Thats correct...not to try and scare you but I've seen a case study where an indoor pool was causing moisture problems (efflorescence, cryptoflorescence, mold, etc. ) from as far away as 150' from the pool. Good luck with your project, best advice I can give you is to COMPLETELY seperate the area with the pool from your house. In otherwords I would have an expansion joint from roof to foundation between the pool room and your house. That way if you have issues down the road at least its in a confined area. Sorry I can't help more but I'm not touching that with a 10 foot pole especially with your climate.
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Old 02-25-2008, 10:06 PM   #20
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Which is better? (Non-vented roof construction with indoor pool)


elbartree,

I did not forget about you. The gentleman I contacted was unable to register on this forum for some reason, but just from the preliminary information I had given to him last week, he responded with the following message.

P.S. I also e-mailed him the original post for him to view the attachment.

Ed


This is the message:

"Ed: still haven't been able to get on the DIY site.

If I were to build a pool (extremely high air rh's), I would probably
use a spray on, high density, closed cell polyurethane. It produces an
airtight surface, has high R value and is a high quality vapour barrier-
really needed in this pool environment. Have to make sure that there
are no thermal bridges through the foam layer as these will lead to
condensation/dripping.

It would be good to see the roof design and structure though; it may
change my recomendation or I may need to make a few suggestions/recommend
changes.

Brian"
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Old 03-26-2008, 11:25 PM   #21
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Which is better? (Non-vented roof construction with indoor pool)


Thank you, Ed!

My appologies for only just now following up on this.

I'm not sure if the BCI (wood I-joist) will create a thermal bridge, but our current plan *is* to use closed-cell spray foam insulation (as opposed to our plan a month ago to use damp-spray cellulose), for the waterproofing qualities Brian points out. Updated description of roof construction accordingly:

shingle
ice shield
osb
sleepers
vapor barrier
osb
radiant barrier
14" BCIs filled in with closed-cell spray foam insulation
TnG pine

I have the framing plan, but its just a bunch of I-joists. The structure is 2 volumes:
1 volume is the pool room, pool systems room, and airlock entry
2nd volume is typical living spaces
They are separated by a 2x6 framed wall topped by a clerestory.
This creates 2 opposing shed roofs with the high point of the small volume 4' lower than that of the large volume (with a short window wall filling in the gap).

Maybe this cross-section helps. The small (left) side is the pool room.
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Which is better?  (Non-vented roof construction with indoor pool)-roof-crosssection.jpg  
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Old 03-27-2008, 12:05 AM   #22
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Which is better? (Non-vented roof construction with indoor pool)


I once again relayed your recent post and concers or questions along to Brian at that other forum.

I will let you know what his comments are.

Ed

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