Smoothing Durock before Painting

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Old 05-26-20, 02:00 PM
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Smoothing Durock before Painting

Hi guys,

what would you use to smooth Durock boards before painting on an outdoor or exterior application?
 

Last edited by MAD King; 05-26-20 at 02:34 PM.
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Old 05-26-20, 03:54 PM
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Kind of hard to reply with so few details.

You should probably stucco it. Spray it with a bonding agent like weld coat. Bed chicken wire and edge flashings in a base coat. Followed by another thin base coat. Then finish (color) coat.

If you want more details PM tightcoat (member here) he knows stucco best.
 
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Old 05-26-20, 04:21 PM
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Curious why you would have exposed CBU?
 
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Old 05-26-20, 04:30 PM
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Why would I want to expose the California Baptist University (CBU)? I do not have any reason for this nor do I want to.
 
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Old 05-26-20, 04:38 PM
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Ahhh, good joke, I hope, cementitious backer unit or CBU (durock)!
 
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Old 05-26-20, 05:03 PM
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If it is painted it would not be exposed anymore.
 
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Old 05-26-20, 06:31 PM
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Old 05-26-20, 06:48 PM
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Oh. Great. Thank you! That is something I was thinking about.
 
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Old 05-27-20, 02:53 AM
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I had to get creative on a portion of my son's house where the house is too close to the grade and not much of a foundation. We used cement board which I stucco'd over. That was 5 or so yrs ago and it still looks good.

It might help to know just what your application will be.
 
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Old 05-27-20, 07:27 AM
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It will be on an exterior wall.
 
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Old 05-27-20, 10:01 AM
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I think it is a continuation of this thread for anyone wondering about the lack of details provided.

https://www.doityourself.com/forum/e...rt-advice.html

You said you used Durock. So your wall has dozens of seams on it. You are just asking for problems if you don't mud and tape your Durock seams and add the correct edging around windows and doors, flashing along bottom edges, and stucco it correctly. There are only a few products (such as DEFS) that are specifically made to go on exterior cement board.

If you wanted something that was ready to paint, you should have used 4x9 sheets of cement siding like I mentioned in the other thread.
 
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Old 05-30-20, 11:48 PM
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USG had a system that used Durock brand board then some kind of joint treatment and some of their proprietary materials for a finish. I don't remember too much about it anymore but they discontinued it.
Seems like you should use some kind of reinforcement over the joints. Not 2" wide fiberglass tape like is used under tile but something stronger and wider just to get more bearing. I don't know just what I would use. Maybe some strips of heavier than usual fiberglass like is used in the EIFS systems. And some of that kind of material for coatings too. Tell us more about what you mean by smooth.
 
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Old 05-31-20, 05:55 AM
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It is already done. Thanks.
 
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Old 06-01-20, 01:59 PM
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So what did you use and how did you do it?
 
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