Replies

1. 
   George_Lentulo | Dec 04, 2000 05:56am | #1

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   Marc, that's interesting ...

   I don't know why it wouldn't work ... you'll tape the joints, etc., on the board, right? I think if the thin set was trowelled on too heavily, could crack a bit ... vinyl admix would help out there, as would building it up in at least two separate applications. But then, if you have to come back anyway, why not use something like Imperial finish or some form of putty-coat over your (joint-taped) board?

   When you say "rough trowelled" finish, is that a textured thing you're going for?

   Geo.

1. 
   Marc_Huster | Dec 04, 2000 04:32pm | #2

   *George, thanks for the reply. The "rough trowel finish" is my best description of the existing walls, of which I'm trying to match to some degree. I wonder if the "new guy" did the plaster in the bathroom( built 1938) as the plaster thickness has huge variabilities in small areas. On one wall where I'm trying to tie old and new finishes, the new wall goes from 1/4" low to perfect to 3/8" high in a matter of about 3 feet. Thanks again for the info- the joints are all taped. I'm leaning towards the setting compound or the thin set as I have the materials on hand. Marc

1. 
   Seaweedsteve_ | Dec 11, 2000 11:05pm | #3

   *--I did a custom shower stall this summer with a concrete curb/foundation and stud walls. The floor was tiled, but to save money and avoid busyness, we cement plastered the walls. I sheathed the studs(over tar paper) with 1/2" wonderboard, taped the joints within and to the concrete, then plastered the whole thing with a rich cement mix, not too different from thinset. I just made a 1:2 cement to silica sand, wetted with acrylic admixture for the 1/4" thick coat. (I colored this as well)In another place, where the cement board ran long out of the wet area to the sheetrock, I plaster it with my usual joint compound/sand texture mix. It's not cracked yet (6 mo. is really too soon to tell) anywhere, although I cautioned the clients that the frame wall to curb joint might.Go for it.

2. 
   Marc_Huster | Dec 11, 2000 11:05pm | #4

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   I'll take any advice- thanks! I need to apply a rough trowel finish over concrete board in a bathroom (the rest of the wall is tile). Is setting -type compound appropriate, or should I just use the left over thin-set mortar? Will the thin-set paint OK? Thanks again, Marc.