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WaterProof Plaster

by Matthew O. Daby last modified Dec 08, 2005 12:15 PM
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WaterProof Plaster

Posted by Matthew O. Daby at December 03. 2005

I am looking for references, installation details, etc. for installing waterproof plaster as shower walls, floor? tub platform, tub itself? Can anyone offer advice, or point me in the fight direction?

see this link for picture refrence as done by Designarc.

thanks all

[url href=][/url]

Re: WaterProof Plaster

Posted by Diego Socolinsky at December 05. 2005

I've looking into this myself, and have come up with the following to resources:

I am particularly interested in the Miracote MCP product. The spech sheet seems to indicate that it can be rolled onto the substrate. That would certainly make it easier than trowelling, especially if you don't want to hire a skilled plaster specialist. Does anyone have any experience with this product?

Re: WaterProof Plaster

Posted by Diego Socolinsky at December 05. 2005

Sorry, that sould have read Miracote MPC (Miracote Protective Coating).

Re: WaterProof Plaster

Posted by mordo at December 08. 2005

I'll give my two cents worth. I'm in the plaster business and have some experience in such things.

I don't know anything about the Miracote product but I will say that anything that is simply rolled on cannot give results comparable to a properly troweled finish coat of Portland cement plaster. I finally found the details of the MCP and no, that's not what you want to use if you want a smooth plaster finish.

The Artisan Finishes products would be a good choice for a shower stall because they are acrylic-modified Portland cement products. Their site indicates that the USG exterior finish system substrate would work well for their finishes. This system relied on cement board like Durock as the substrate and while i'm sure that would work well and would be relatively easy, it's not as desirable as a proper three-coat Portland cement plaster sytem on metal lath. This method of course require more plastering skills than using a cement board substrate. you can still get Durock but USGs other exterior system products are no longer available. There are many other systems available form manufacturers like Sto, Dryvit, etc.

Cement board as a substrate will work best if built on metal stud walls rather than wood for expansion/contraction factors.

The most important factor in making and impervious PCP finish is to densify the finish thoroughly with a steel trowel to the greatest extent that the material will allow. You shold be able to trowel up a very slick, glossy surface with the material.

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