flooring membrane questions

[dfphoto]

Hi group, have a condo with a cement floor, had the kitchen leveled and had 3 tile guys come by and take a look at my job. Two want to put a membrane on the floor and on my shower surround. The floor due to cracks, the surround to avoid moisture.

My question is: have anyone used ardex as a membrane and or redgard on the cracks instead of the membrane the cost of the membrane sheets is quite high from 1-3.50 depending on the brand the redgard is aobut 45.00 a gallon.

Your help is appreciated.

BTW on the surround we have waterproof paper on the studs followed by wonderboard, my idea was to put 3 coats of redgard, followed by the membrane sheeting which is glued on (bonding agent) then the thinset and tile. Thanks

 

[nealtw]

Redgaard on the wall would be enough, The membrane on the floor should be one that will uncouple if a crack moves and you need it for waterproofing.

 

[erwabo]

I agree with Neal, my in-laws has that very thing happen to them in their basement bathroom. Their were a couple existing cracks around the shower surround location, that used some cheap patching to fill, figured it would not be any harm. I did not get a chance to see what the tile guys laid, but sure enough...the tile cracked right along the same path the initial floor crack was.

 

[dfphoto]

Hi thanks for the replies, I am not sure what to do about the cement floor been reading a bit and it seems like the mfc of redgard says it's fine for cracks on cement floors up to 1/8" which mine are.
Not sure what to do...

 

[nealtw]

The question is, Will the cracks move over time? If the answer is no, then redgaard will do. But what is is the price for a job that might have to be done again ?