The Trilogy of Exterior Masonry PreservationThe Trilogy is your guide to the repair, restoration, and preservation of exterior masonry and concrete surfaces for structures of all ages. Whether new, two, or two hundred years old the chemistry and principles are the same. Author is a primary author of ASTMs definitive publication, STP 935, Cleaning Stone and Masonry. Author was a featured speaker at the 2010 APT Conference, and was invited to speak on The Evolution of Doomed Practices, which
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