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NC-2009 IEQc4.1:Low-Emitting Materials—Adhesives and Sealants

Powder products mixed with water on site application

We are pursuing Credit IEQc4.1 in LEED NC v2009 for low emitting adhesives and sealants. We are looking to use a powder based waterproofing product for our concrete and fuel tanks (indoors, unoccupied areas like basement, mechanical rooms etc) . The issue is, the application involves using it in liquid form (like a paste) after mixing with water only. The manufacturer insists it has no VOCs ( which if applied in powder form, would be irrelevant as it is exempt from credit requirements anyway) however he also insists that when mixed with water and applied as a sealant in liquid/ adhesive like form which is how it will actually be applied on site, it will still emit no VOCs. Manufacturer has not provided any data (lab tests etc) to support this statement. My question is this : first , do powders mixed with water on site used for waterproofing (would be considered a sealant) still have to conform to credit requirements ? Or are they exempt ? Thank you.

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Tue, 08/01/2017 - 15:06

In the past, I have listed this type of product under EQc4.2 - SCAQMD 1113: (15) CONCRETE-CURING COMPOUNDS are coatings formulated for or applied to freshly poured concrete to retard the evaporation of water. Concrete-curing compounds manufactured and used for roadways and bridges (does not include curbs and gutters, sidewalks, islands, driveways and other miscellaneous concrete areas) are those concrete-curing compounds that meet ASTM Designation C309, Class B, and meet a loss of water standard of less than 0.15-kg/m2 in 24 hours as determined by the California Transportation Department, California Test 534. Concrete-Curing Compounds max VOC 100 g/l As well, I believe for this product and for LEED 2009, a signed letter from the manufacturer would be sufficient.

Mon, 08/07/2017 - 11:13

Thanks for this , I went through IEQc4.2 requirements and agree that is a better fit . What do you think re: the form of application ie the fact this product comes in powder form and is mixed on site (with water) and applied in liquid form? My understanding is that requirements for IEQc4.2 would still apply as it is not used as a powder but as a "liquid/ paste" , but I would expect VOCs to be low as it is mixed with water only on site.

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