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-   -   Mortar on concrete slab (http://www.diychatroom.com/f105/mortar-concrete-slab-141159/)

gbonin 04-23-2012 12:14 AM

Mortar on concrete slab
 
I am building a slop shower pan with mortar. Should I add concrete glue to the mortar for it to bond to the concrete.

jklingel 04-23-2012 12:41 AM

it's likely best to ask at a local concrete place. they should have the answers and the materials. what you propose does not sound like the proper attack, but i am not a concrete guy.

bill01 04-23-2012 08:01 AM

Generally if the concrete is clean the cement in your "mortar?" will bond. Many times they recommend you acid wash the concrete to insure it is clean.

It more than likely is no better bond than say tile if you tried really hard you would be able to separate it. I am not sure it matters a lot. Most showers pans built like this use 2 layers of concrete with a rubber like layer between them. The top layer of concrete seems to have no issues even though I can't see how it would ever bond to a smooth waterproof membrane.

TRUEPRO 04-24-2012 08:26 AM

Mortar will easily bond to concrete. Sounds like your building this shower pan on a slab? Not sure where your getting your ideas or info from but you must propery install the rubber membrane underneath the shower pan. If your using mortar (not recommended) then it should never come in contact with the concrete below.

jomama45 04-24-2012 10:49 AM

Quote:

Originally Posted by TRUEPRO (Post 906167)
Mortar will easily bond to concrete. Sounds like your building this shower pan on a slab? Not sure where your getting your ideas or info from but you must propery install the rubber membrane underneath the shower pan. If your using mortar (not recommended) then it should never come in contact with the concrete below.

It's called a "pre-slope", and it get's poured below the rubber so any possible leaks actually find their way to the weeps in the drain.............


Or, it's just a simple "slop" shower in his/her garage for a dog or something.....


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