Lime Wash over Stucco

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Author Message Lisa Goodwin Robbins, RA, CCS, LEED ap Senior Member Username: lgoodrob Post Number: 249 Registered: 08-2004 Posted on Wednesday, July 30, 2014 - 09:12 am:    My Architect client wants a 'lime wash' over 3 coat traditional stucco. It's mostly a patch and repair job for a private school building in western MA, but I don't know lime wash. Perhaps this is more common in other parts of the world. I found a paper online called LIMEWASH: COMPATIBLE COVERINGS FOR MASONRY AND STUCCO, by Peter Mold and Richard Godbey, 2005. Are you familiar with this technique? Do you have other suggestions? - Mary (Unregistered Guest) Unregistered guest Posted on Thursday, October 30, 2014 - 11:47 am:    I am painting Lyme wash on a brick house. The first five walls came out nice and very white. Yesterday we ran into a problem where the lyme wash that was applied as it dried it turned tan. The brick was wet when the lyme was applied. Would this make it turn tan, and not retain the white? Will it eventually turn white again? Or should we power wash it all off before it dries completely and let the brick dry for a few days and reapply? David G. Axt, CCS, CSI ,SCIP Senior Member Username: david_axt Post Number: 1375 Registered: 03-2002 Posted on Thursday, October 30, 2014 - 02:18 pm:    Mary, I think that you mean "lime" not "lyme". I have found the technical documents and stucco guide to be very helpful at the Northwest Wall and Ceiling Bureau. https://www.nwcb.org/ David G. Axt, CCS, CSI, SCIP Specifications Consultant/Web Publisher www.localproductreps.com Justatim Senior Member Username: justatim Post Number: 62 Registered: 04-2010 Posted on Friday, October 31, 2014 - 08:25 am:    The base of lime wash is lime putty (hydrated lime) and water to thin it. It is generally semi-transparent if applied in one coat. As it carbonates, it returns chemically to calcium carbonate, which is also water soluble. Consequently, it requires reapplication, usually annually, unless tallow, cactus mucilage, or another material is added to reduce its solubility. It is naturally white (without pigments)and moisture alone in/on the substrate should not affect it's color. If one coat is placed over brown brick, the appearance might be tan.