I HAD LAID SOME ANTIQUE CLAY BRICK ON THE FLOOR IN A FOYER, ABOUT 2 MONTHS AGO. tHE BASE WAS CEMNT BOARD ATOP 3/4″PLYWOOD SUBFLOOR. rEALIZED THAT THE MORTAR JOINTS SEEMED TO RECEDE QUITE A BIT MORE THAN I HAD EXPECTED. IS THIS COMMON, OR DOES IT DEPEND ON THE QUALITY OR TOO MUCH H2O IN THE MIXXED BATCH….? iN THE FUTURE, WHAT BRAND OR RECIPE WHAT GUARANTEE MINIMAL SHRINKAGE OF THE MORTAR JOINTS?
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Greetings C,
This post, in response to your question, will bump the thread through the 'recent discussion' listing again.
Perhaps it will catch someones attention that can help you with advice.
Cheers
I'm guessing your refering to the 1/2" gout between the bricks. If the grout is not cracked in the middle, but there is two lines of cracks where the motar touches the brick, then I have the answer. The bricks were not soaked or wet before the grout was done, a dry brick will suck out the water too quickly before hardening.
Spray down your bricks next time.... Test the brick by putting 12 drops of water on it, it should take a full minute to absorb to the point of being dry---if not, wet them again