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NC-2009 IEQc4.2:Low-Emitting Materials—Paints and Coatings

Anti-Rust Coatings

I am a little confused by the anti-rust paint/coating VOC limits. The second bullet-point for this credit states that anti-corrosive and anti-rust paints must not exceed 250g/L, which is consistent with the credit form. However, when I go to Table 1, I see a line item titled Rust:preventative coatings that has a VOC limit of 400g/L per SCAQMD #1113 dated 1/1/03. What is the difference? I was given a list from the contractor referencing Rust Preventative Coatings having a limit of 400g/L, which does seem to comply with the manual, but there is no corresponding option in the form. I didn't see it mentioned in any of the addenda, so I'm not sure how to advise. Has anyone else had this problem?

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Emily Catacchio
Sustainability Specialist
Wight and Company
LEEDuser Basic Member
415 thumbs up

Wed, 02/08/2012 - 23:31

Ellen,

I'm not sure what "Table 1" you're referring to...

For the purposes of LEED anti-rust coatings are not governed by the SCAQMD limits, but rather by the Green Seal Standard (see above credit language).

Wed, 02/08/2012 - 23:40

Hey Emily - thanks for the quick reply. I am referring to Table 1: Standard VOC limits - pg.483 in the BD+C reference guide. This appears to be the SCAQMD 1113 table (google search of SCAQMD 1113 produces the same chart). There is a line item called Rust:preventative coatings that has a current limit of 400g/L which is presumably still valid for LEED, but went down to 100g/L effective 7/1/06. My question is how this differs from the anti-corrosive/anti-rust paint requirement of 250g/L outlined in the credit requirements.
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Lindsey Evans
Architectural Designer
PGAV, Inc.
LEEDuser Basic Member
14 thumbs up

Wed, 02/08/2012 - 23:50

Ellen, It differs because the requirement in the Table 1 you are referencing is from SCAQMD Rule 1113 and the Credit Requirements are from Green Seal Standard GC-03. For this credit anti-corrosive and anti-rust paints are regulated by GC-03. The VOC listed in the table does not apply for this VOC category. Also, Table 1 was revised on 11/3/2010 with the Addenda. Search here for it: https://www.usgbc.org/leedinterpretations/LILanding.aspx Based on when your project was registered you may be subject to the information in this Addenda. Either way, because of the credit requirements specifying GC-03, the requirement that applies to this credit for anti-corrosive and anti-rust paints is 250g/L.
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Bruce Maine
Sustainable Design Consultant
LEEDuser Basic Member
51 thumbs up

Mon, 02/13/2012 - 18:20

We've pretty much removed all the rust preventative and galvanizing coatings over 250 g/L from our specifications. Your Tnemec rep, or others, should be able to offer a wide variety of substitutions. By the way, GS-03 has been retired and the anti-corrosive paints are referenced in GS-11.
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Laurent Kanago
President
Candid Sustainability
LEEDuser Basic Member
0 thumbs up

Tue, 12/04/2012 - 20:33

This may be a little for your project but should help in general. The 100g/l Rust-Preventative Coatings in GS-11 only applies "to interior walls and ceilings", not metals. The GS-03 250g/l limit is then used only for "interior ferrous metal substrates." I was confused also, but was quick to notice it. Hope this helps!

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