No direct knowledge but many concerns spring to mind immediately including: Why do you want to increase water repellency? What is in this stuff that makes it repellant? What other changes will happen to the mortar? Will vapor transmission be affected? How will compression, adhesion be affected? I am just shootin' from the hip here and await comments from Mr. Edison and Walsh... Eric Hammarberg, Assoc. AIA Vice President Thornton Tomasetti 51 Madison Avenue New York, NY 10010 T 917.661.7800 F 917.661.7801 D 917.661.8160 [log in to unmask] www.ThorntonTomasetti.com -----Original Message----- From: The listserv where the buildings do the talking [mailto:[log in to unmask]] On Behalf Of Ilene R. Tyler Sent: Wednesday, April 08, 2009 12:35 PM To: [log in to unmask] Subject: [BP] Grace's Dry-Block New thread: does anyone know this product - Grace's Dry-Block II Mortar Admixture? Can it be used as a mortar additive to Type N mix for pointing glazed terra cotta to improve water repellency of the mortar? I'm concerned about trapping moisture in the assembly, and causing more damage than already occurs with the failed mortar. Thought I'd throw it out there for you all to chomp on...many thanks. QUINN EVANS | ARCHITECTS Ilene R. Tyler, FAIA, FAPT, LEED AP v 734.663.5888 -- To terminate puerile preservation prattling among pals and the uncoffee-ed, or to change your settings, go to: <http://listserv.icors.org/archives/bullamanka-pinheads.html> *Please vote for ICORS every 24 hours* <http://www.lsoft.com/news/choicevote.asp> <><><><><><><><><><><><><><><><><><><><><><><><><><><><><><><> The information in this email and any attachments may contain confidential information that is intended solely for the attention and use of the named addressee(s). This message or any part thereof must not be disclosed, copied, distributed or retained by any person without authorization from the addressee. If you are not the intended addressee, please notify the sender immediately, and delete this message. <><><><><><><><><><><><><><><><><><><><><><><><><><><><><><><> -- To terminate puerile preservation prattling among pals and the uncoffee-ed, or to change your settings, go to: <http://listserv.icors.org/archives/bullamanka-pinheads.html> *Please vote for ICORS every 24 hours* <http://www.lsoft.com/news/choicevote.asp>