| Author |
Message |
Di Ann Hassloch
Intermediate Member
Username: dhassloch
Post Number: 4
Registered: 07-2005
| | Posted on Tuesday, June 12, 2007 - 12:10 pm: |    |
We have a LEED project team wanting a clear finish on an interior exposed steel column. Therefore, the VOC content must be 50 g/L or less. Has anyone had success with a product for this application? Tnemec has several options, but they are epoxies, and this application will be exposed to UV. Thank you for any assistance. |
Lynn Javoroski CSI CCS LEED™ AP SCIP Affiliate
Senior Member
Username: lynn_javoroski
Post Number: 598
Registered: 07-2002
| | Posted on Tuesday, June 12, 2007 - 12:17 pm: | |
Is the steel galvanized? |
Di Ann Hassloch
Advanced Member
Username: dhassloch
Post Number: 5
Registered: 07-2005
| | Posted on Tuesday, June 12, 2007 - 12:55 pm: | |
It has not been erected yet, so can still go either way, but it has been specified to be galvanized. |
Anonymous
| | Posted on Tuesday, June 12, 2007 - 02:04 pm: | |
Shop coat the steel with whatever you need, and the LEED requirements do not apply. |
Di Ann Hassloch
Senior Member
Username: dhassloch
Post Number: 6
Registered: 07-2005
| | Posted on Tuesday, June 12, 2007 - 02:40 pm: | |
That would be preferable, but they need to do sand blasting and welding in the field, and want to maintain the industrial look. |
Steven Bruneel, AIA, CSI-CDT, LEED-AP
Senior Member
Username: redseca2
Post Number: 63
Registered: 12-2006
| | Posted on Tuesday, June 12, 2007 - 03:18 pm: | |
Here is a link to an article about the exposed steel at Pixar Movie Studios (hope you can make it work):
http://www.aisc.org/MSCTemplate.cfm?Section=Back_Issues1&template=/ContentManagement/ContentDisplay.cfm&ContentID=21946
This is a look, clear coated steel with warts and blemishes, I have been asked to try to match in the past. |
Lynn Javoroski CSI CCS LEED™ AP SCIP Affiliate
Senior Member
Username: lynn_javoroski
Post Number: 600
Registered: 07-2002
| | Posted on Tuesday, June 12, 2007 - 04:01 pm: | |
Try searching for what you need here: http://www.ppgpmc.com/ |
Randy Cox
Senior Member
Username: randy_cox
Post Number: 41
Registered: 04-2004
| | Posted on Wednesday, June 13, 2007 - 08:01 am: | |
does the column need to be fire rated? |
Di Ann Hassloch, CSI, CCS, CCCA, LEED AP
Senior Member
Username: dhassloch
Post Number: 7
Registered: 07-2005
| | Posted on Wednesday, June 13, 2007 - 02:15 pm: | |
It does not have to be fire-rated, and it has been specified to be shop primed, sandblasted in the field to remove all primer, and then to be clear-coated to maintain the steel look. |
Anonymous
| | Posted on Wednesday, June 13, 2007 - 03:21 pm: | |
Yesterday it was specified to be galvanized. Your designers must be worse than mine. |
Di Ann Hassloch, CSI, CCS, CCCA, LEED AP
Senior Member
Username: dhassloch
Post Number: 8
Registered: 07-2005
| | Posted on Wednesday, June 13, 2007 - 07:58 pm: | |
Two different projects, two different structural engineers.
PPG has declined to offer any products for this use. I found the article on Pixar, but without any product information.
Thank you all for your assistance. It looks like we'll be painting. |
Ralph Liebing, RA, CSI
Senior Member
Username: rliebing
Post Number: 635
Registered: 02-2003
| | Posted on Thursday, June 14, 2007 - 07:05 am: | |
Try e-mail to tippoliti@sherwin.com
Tony is a corrosion engineer who is a wealth of information on sophisticated coatings. I would think such a person might be a better source than just a paint rep. |
John Bunzick, CCS, CCCA
Senior Member
Username: bunzick
Post Number: 737
Registered: 03-2002
| | Posted on Thursday, June 14, 2007 - 09:06 am: | |
If the column is indoors, glass will filter out some of the UV that would be detrimental to epoxies. You may want to look at your glazing system to see how much filtering of UV it would have, and then check with Tnemec again. Some coatings, and PVB interlayers especially, block UV. PPG says 6mm clear glass filters 50% of UV, but I don't know what wavelength cutoff they're using. It seems to me that this would probably be acceptable in an indoor environment. Also, consider that minor yellowing or chalking may not be noticable with the particular application you have. |
Steven Bruneel, AIA, CSI-CDT, LEED-AP
Senior Member
Username: redseca2
Post Number: 64
Registered: 12-2006
| | Posted on Thursday, June 14, 2007 - 12:23 pm: | |
Regarding a clear finish on interior steel: I found this from a project in Utah (VOC's are not recorded because they were not an issue at this time and place):
Interior Work: Provide clear aliphatic acrylic-polyester polyurethane high-build coating system.
1. First Base Coat: Clear satin formulation of "Carbothane 133-HB" as manufactured by Carboline, or equal; not less than 4.0 mils dry film thickness.
2. Second Base Coat: Clear satin formulation of "Carbothane 133-HB" as manufactured by Carboline, or equal; not less than 4.0 mils dry film thickness.
3. Topcoat: Satin formulation of "Carbothane Clear-Coat AG" as manufactured by Carboline, or equal; not less than 2.0 mils dry film thickness. |
Richard L Matteo, AIA, CSI, CCS
Senior Member
Username: rlmat
Post Number: 221
Registered: 10-2003
| | Posted on Thursday, June 14, 2007 - 12:52 pm: | |
Carboline is an excellent choice as far as product goes, but I would check with your local rep as to VOC compliance in your area.
However, the HB has a VOC content of 383 g/l
and the AG has a VOC content of 335 g/l
133VOC is the best at 157 g/l
I think you're going to have a difficult time finding anything at or below 50 g/l
Even here in California, where we have some of the toughest VOC standards, we are at 100 g/l |
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