Masonry Magazine June 1992 Page. 35
All That Warps Is Not
Certain agglomerate marble tiles with resinous or cement matrix and precast concrete tiles may warp after the pieces have been set for a few days.
By ROBERT T. YOUNG, CSI
President, Ceramic Tile and Marble Consultants
MANY OF YOU have read about the warping characteristics of green colored marble. The green marble is reasonably predictable-almost all of it will warp to some degree if it's set in a waterbased bonding material (i.e. conventional wet set mortar bed system, dry set bonding mortar, latex bonding mortar, or modified epoxy emulsion bonding mortar).
The only safe method of bonding green marble is by using one-hundred percent solids epoxy bonding mortar. This prevents the marble from coming in contact with the water which causes the warping. Some people have taken chances and gotten by with 4" material and even a few have made it with ½" green marble tile. Most of these jobs escaped because of less than rigid inspection. I have yet to find one of the projects where water based bonding materials were used that I didn't find hollow sounding corners when the pieces were sounded.
There may be other jobs where a miracle, or divine intervention saved a contractor because of his faith-after all, Jonah got out of the whale and the lions didn't eat Daniel. Personally, I don't like to take the kind of chances that were forced upon Jonah or Daniel. My conservative nature is mostly due to the wide yellow streak that runs up my back! I don't even put a quarter in the slot machines when I go to Las Vegas. Today we are finding other warping problems. Certain agglomerate marble tiles with resinous or cement matrix and precast concrete tiles may warp after the pieces have been set for a few days.
Green Marble
in those glass block jobs with clear product superiority! Weck gives you a significant advantage when you compete for glass block jobs. Undeniable product superiority. You can hardly lose with:
1. The industry's only honest 90-degree corner block. With beautiful corners, continuous channel for mortar and reinforcement.
2. Superior end blocks which include a double end block for use in corners or step down designs.
Glashaus, Inc.
415 W. Golf Rd. #13
Arlington Hts., IL 60005
(708) 640-6910
MASONRY-MAY/JUNE, 1992 35