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

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