Just a quick question, I’m in the process of taping the drywall in my new bath (can you tell I’m busy today? Been up since 5:30am) and am wondering what I should use for the transition where drywall meets the CBU. (Already laid in fiberglass tape) If you look at the photo, you will see I put down CBU at the base of a box bay (base will be tiled) and drywall on the walls (walls will be painted). Should I use taping compound or thinset to cover the joint? I doubt this area will ever see much if any moisture.
Jon
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If indeed this is a location that won't see water, then you are OK with mud but I wouldn't. One good sturation and you are shot. This is a horizontal surface and I have yet to see a bathroom that never sees water build up on horizontal surfaces.
You could do it OK with Durabond.
Excellence is its own reward!
Never used Durabond. I take it (from seeing it mentioned in other posts) that it's a powder that's mixed with (water?[anything better{Andy B.?}]) and once set, is relatively waterproof. If that is the case, on the way home from work tomorrow, I'll look into it at the local Farm & Fleet. Will check this post before leaving for work tomorrow (5:00am) so anybody else with comments/suggestions please let me know what you know.
Thanks,
Jon
I wouldn't say it's waterproof really but it's a whole diferent world from premixed taping compound which sets up bty DRYING. As oon as you get that stuff wet again is is wet and slimy.
Durabond is a SETTING TYPE compoiund that cures chemically, like portland concrete products do. DB90 is probably the most common. You have about 90 minutes to use it after mixing according to instuctions so only mix what you can use in that time and then clean your bucket and tools before mixing another batch. It just about right for working between coffee breaks and lunch breaks.
It does set hard and that mnakes for hard work if you are not troweling it down smooth - so try not to leave ridges for sanding..
Excellence is its own reward!
I'd do the joints that you picture with thinset and then topcoat on the wall surfaces only with drywall mud. Durabond would be my first choice for drywall mud but you are not likely to get it at the "Farm & Feed". Here in Saint Louis I only have one supplier left for it and they are a yard that carries a full line of plasterers supplies. The 90 minute easy sand type mixes would also be okay for topcoating, on the vertical surfaces only.