| Author |
Message |
Mitch Miller, AIA ,CSI, CCS, MAI
Senior Member
Username: m2architek
Post Number: 129
Registered: 02-2004
| | Posted on Wednesday, December 03, 2008 - 05:13 pm: |    |
Does anyone know of a product that will provide a "vapor Barrier" on the inside surface of the exposed wood deck in a pool environment? I am looking for a clear coating that will have a perm rating of less than 1. HELP please |
Phil Kabza
Senior Member
Username: phil_kabza
Post Number: 351
Registered: 12-2002
| | Posted on Wednesday, December 03, 2008 - 06:28 pm: | |
Yummm! The many joints in the wood deck will work just like a razor works on a vapor barrier sheet. Can't seal them, so don't try. You should put the vapor/air barrier above the wood deck, and put enough insulation on top of it to keep the dewpoint outboard of the vapor barrier year round. It'll be a bunch of insulation, because the relative humidity inside the natatorium will be ... rain. Time for a WUFI analysis. Don't forget the stainless steel fasteners and lintels and negative pressure HVAC and all that other pool stuff. |
Wayne Yancey
Senior Member
Username: wayne_yancey
Post Number: 145
Registered: 01-2008
| | Posted on Wednesday, December 03, 2008 - 06:39 pm: | |
Mitch,
I second Phil's reply and must add make it an air/vapor barrier connected to the wall air/vapor barrier connected to the foundation air/vapor barrier/waterproofing connected to the under slab air/vapor barrier.
Seekout Joesph Lstiburek's article "THE PERFECT WALL" in the May 2007 issue of the ASHRAE Journal or e-mail me at wayne.yancey@callison.com and I will send you a PDF verison. |
John Bunzick, CCS, CCCA, LEED AP
Senior Member
Username: bunzick
Post Number: 994
Registered: 03-2002
| | Posted on Thursday, December 04, 2008 - 08:27 am: | |
What Wayne is talking about is really an air barrier, which is very happy to be the same membrane as the vapor retarder, though it doesn't necessarily have to be. If they're not, make sure that the dew point analysis and permeability of the two support the locations chosen for each. |
Anonymous
| | Posted on Thursday, December 04, 2008 - 09:17 am: | |
Wayne, isn't the title of the article,
"The Perfect Storm Over Stucco" |
Curt Norton, CSI, CCS
Senior Member
Username: curtn
Post Number: 122
Registered: 06-2002
| | Posted on Thursday, December 04, 2008 - 09:38 am: | |
We use a 40 mil sheet such as WR Grace Ice and Water Shield over the timber decking, then the diaphragm plywood (to protect it from the moisture) then nailbase insulation with XPS instead of ISO. That is our standard over pools & waterparks. |
Wayne Yancey
Senior Member
Username: wayne_yancey
Post Number: 146
Registered: 01-2008
| | Posted on Thursday, December 04, 2008 - 10:24 am: | |
To Anonymous,
No.
E-mail me and I will reply with the article I quoted. |
Ronald L. Geren, AIA, CSI, CCS, CCCA, SCIP
Senior Member
Username: specman
Post Number: 716
Registered: 03-2003
| | Posted on Thursday, December 04, 2008 - 10:46 am: | |
Wayne:
The full, unedited, and updated article can be downloaded via buildingscience.com:
The Perfect Wall |
Wayne Yancey
Senior Member
Username: wayne_yancey
Post Number: 147
Registered: 01-2008
| | Posted on Thursday, December 04, 2008 - 10:49 am: | |
Ron,
Thanks but I know this. That is the source for my Building Science Corporation articles by Dr. Joe. |
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