| Author |
Message |
Vivian Volz, AIA, CSI, CCS
Senior Member
Username: vivianvolz
Post Number: 166
Registered: 06-2004
| | Posted on Tuesday, January 31, 2017 - 04:32 pm: |    |
I'm looking for a non-combustible drainage plane that is noncombustible per ASTM E136. A mat would be great, since it's behind stucco and needs a fabric to keep the plaster out of the drainage plane. Seems like all these tangled-mesh plastic products with the filter fabric have a decent flame spread (less than 50) but aren't tested per ASTM E136. I'm trying to take advantage of the exception in IBC 2015/CBC 2016 1403.5 that allows a tall wall assembly not to need an NFPA 285 test if the air barrier is the only combustible component in the wall.
Whatcha got? Name names, please! |
Ellis C. Whitby, PE, CSI, AIA, LEED
Senior Member
Username: ecwhitby
Post Number: 285
Registered: 03-2003
| | Posted on Thursday, February 02, 2017 - 10:14 am: | |
Perhaps you could use metal lath, installed on vertical hat channels. Galvanized or stainless steel of course. |
David G. Axt, CCS, CSI ,SCIP
Senior Member
Username: david_axt
Post Number: 1543
Registered: 03-2002
| | Posted on Friday, February 03, 2017 - 01:41 pm: | |
Vivian, I highly recommend The Stucco Resource Guide from the Northwest Wall and Ceiling Bureau. It is a great reference for technical data and details for stucco.
http://www.nwcb.org/stucco-resource-guide.html
David G. Axt, CCS, CSI, SCIP
Specifications Consultant
Axt Consulting LLC |
Vivian Volz, AIA, CSI, CCS
Senior Member
Username: vivianvolz
Post Number: 168
Registered: 06-2004
| | Posted on Monday, February 06, 2017 - 07:01 pm: | |
I did find a few lath-like solutions and spacer solutions galore.
And I had one manufacturer (in keeping with my request to name names, it's Stuc-O-Flex) point out that the drainage plane could reasonably be considered part of the air barrier, and thus be allowed to be combustible. I haven't tried that approach yet with the code official, in the hopes of finding a true tested solution.
David, it's a brand new exception in the code (for us in California, anyway), so since the stucco guide is $95 and I just bought its competitor for $89 from WWCCA, do you mind taking a look at it and seeing if it contains answers to my question? (The WWCCA book is not helpful on this topic, but has terrific photos of plaster textures.) |
Vivian Volz, AIA, CSI, CCS
Senior Member
Username: vivianvolz
Post Number: 169
Registered: 06-2004
| | Posted on Tuesday, February 07, 2017 - 07:45 pm: | |
I have officially given up trying to find a non-combustible mesh drainage plane. If the owner team decides they're comfortable calling it part of the weather barrier, I will report back how that goes. |
Guest (Unregistered Guest)
Unregistered guest
| | Posted on Wednesday, February 08, 2017 - 11:24 am: | |
Vivian, would something like Tyvek's Stucco Wrap work? It is a weather barrier designed to act as a drainage plane.
"DuPont™ Tyvek® StuccoWrap® WRB has an engineered, grooved surface – that is designed to be installed as a drainage plane behind stucco facades and EIFS systems."
http://www.dupont.com/products-and-services/construction-materials/building-envelope-systems/brands/water-barrier-systems/products/tyvek-stuccowrap.html |
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