Will Silicone adhere to cement board?

Old 05-31-15, 08:12 AM
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Will Silicone adhere to cement board?

I'm going to be using full engineered marble (fake marble) slabs as my shower walls. The company that's making them for me suggests using silicone to adhere them to the substrate. They actually recommended that since there are not grouted areas like there would be with separate tiles and the only potential for water behind them is where I caulk or silicone the joints...to just use greenboard as the substrate.

I had decided to use cement board instead just as an added safety net, but the more I've been thinking, I've come to the question:

Will the silicone stick to cement board?

and furthermore if I decided to take a final precautionary waterproofing step of redguard over the cement board, will silicone stick to redguard?

Thanks in advance
Old 05-31-15, 08:52 AM
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Cement board as opposed to the green board was a very smart choice. If you do get a leak your wall will remain intact.

I can't answer the bonding agent question but the pro's will be by to help you out.
Old 05-31-15, 11:23 AM
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The label on the silicon will tell what materials are compatible with the product.
Old 05-31-15, 11:30 AM
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We adhere solid surface members, both vertical and horizontal with silicone on commercial jobsites, to underlayment, sheetrock, and to plywood, but I am not too keen on wet areas. Jazman will be along with his ideas and recommendations.
Old 05-31-15, 05:51 PM
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Sure, the silicone caulk will bond to concrete backer very well, it'l stick to most things. Not so much the other way though. For example most paints and many adhesive don't like silicone.


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