Cement Grout Natural Stone Portland 
Floor Covering News
MAY 6, 2022
“It’s important for exterior installations to be protected from the [prospect] of efflorescence,” said Ian O’Connor, product manager, grout, care and tools, Custom Building Products. He recommended a rapid-setting, high-performance cement grout as well as a rapid-set, high-performance mortar. Custom Building Products.
Architectural Ceramics
DECEMBER 10, 2015
It would be prudent to recommend the use of White Thinset for all natural stone installations, but that may not prevent yellowing from occurring completely. Yellowing may still happen in a shower area where mud work or wet bed has been done using Gray Portland cement. Why is White Thinset insufficient in this application?
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