No grout cracks?
I too had someone recently tell me that drywall and the cement board on top of each other cause each other to expand and contract in 'shifts' causing cracks in grout. Jim answered about cbu and tile expand and contract at the same rate, but the drywall is different (might be why lot's of people say take the drywall out completely.) But I have the exact situation noted here, 1/4" durarock on top of greenboard, vapor barrier over the greenboard, cbu properly screwed in and taped. but I wondered like the last question, will the grout crack prematurely if all else is done right?
This "pro" further told me the cbu needs to breath and the vapor barrier can stop that hence cause the cracking, and that's where I devalued his opinion. But I don't want the grout to crack! ...Studs, Greenboard, vapor barrier, 1/4" cbu, good thinset, grout, sealer...any concerns about cracking? Guess I should add I'm in a basement with pretty constant tempature and humidity.
Thanks!
Roger