Cementitious Waterproofing

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Author Message Sean Stewart AIA (Unregistered Guest) Unregistered guest Posted on Friday, June 08, 2012 - 04:32 pm:    I am an architect working on an institutional project where the 40+year old existing drawings note a 1" thick "metallic waterproofing" topcoat on the basement slab. The new project calls for a few penetrations through the slab that I would propose patching with a material that generally matches the existing - i.e. 1" thick "metallic waterproofing" topcoat. I have been practicing for 30 years but have never encountered this material before. My research has yielded little but it sounds like this site might be visited by a few folks who are very familiar with the product. I would appreciate it if anyone familiar with "metallic waterproofing" can share their knowledge with me. Feel free to reach out. Thanks! ken hercenberg Senior Member Username: khercenberg Post Number: 266 Registered: 12-2006 Posted on Friday, June 08, 2012 - 06:08 pm:    Hi Sean. Metallic Waterproofing used to be the way to go when you needed negative side waterproofing. Essentially you mixed iron filings in cement plaster, troweled onto your walls, and painted over it if you cared what it looked like. Over time, as water migrated in, the iron filings would turn into a water-tight barrier of rust, at least until it eroded away. Nowadays we tend to use crystalline or other forms of reactive waterproofing. Take a look at http://www.4specs.com/s/07/07-1600.html. I like Aquafin. Al Kessi knows his stuff and is usually pretty helpful with your situation. Best of luck. David E Lorenzini Senior Member Username: deloren Post Number: 133 Registered: 04-2000 Posted on Friday, June 08, 2012 - 10:40 pm:    It's possible that Sean's 40+ year old drawings are referrng to Magnesite flooring. I heard a lot about it from the terrazzo company I worked for during college summers. There are a lot of hits on "magnasite flooring" on Google and Bing. One link, http://www.magnesitespecialties.com/Home-floors.htm, advertises the following: "Waterproof Deck Coating - For patios, traffic deck balconies, roofs, walkways, and much more, Magnesite Specialties, Inc. can provide the experienced solution to your waterproofing needs. Whether it's a question on repair, new construction, or just wanting to enhance your home, our estimators will personally inspect the situation. We also install commercial waterproof deck coating and below grade waterproofing in millions of square feet." A similar product with a similar name, Magnesite (Magnesium Oxychloride) Flooring, is easy to confuse with the Magnesite made with sand & cement. It was very susceptible to deterioration by standing water. Also, the magnesium oxychloride version would rust all the trowels and other steel tools if not cleaned up quickly. David Lorenzini, FCSI, CCS Architectural Resources Co. Jeffrey Wilson CSI CCS Senior Member Username: wilsonconsulting Post Number: 69 Registered: 03-2006 Posted on Sunday, June 10, 2012 - 08:58 am:    I would assume metallic waterproofing refers to "metal oxide waterproofing." Although this is a product type w/ a long history of use, it is still made and I have one client who still thinks it is the best thing for certain applications -- particularly for waterproofing inside walls & floors of below-grade pits including elevator pits. The company I am most familiar with is Metalcrete Industries. Their website indicates that "Metalcrete Waterproofing" is still available, so could presumably be used for patching on the project in question. Other products listed in the MasterSpec section (which is included in the current library) include "A-H Metallic Waterproofing" by Anti-Hydro International; "Iron Waterpeller" by The Euclid Chemical Company; and "Speccrete Metallic Waterproofer" by Specco Industries.