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Q about installing Wonderboard (concrete backer board) zxcvbob 12-20-2006
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Posted by zxcvbob on December 20, 2006, 9:27 pm


When two pieces of backer board meet at an inside corner, do I leave a
little gap, fill it with thinset, then embed a strip of fiberglass tape
like I would a wall seam? Or do I *not* use the tape, and (knowing it will
eventually crack down the center of the joint) use caulk instead of grout
where the tiles meet in the corner? Maybe I'm supposed to tape the corners
*and* use caulk instead of grout?

Thanks,
Bob

Posted by Rich on December 20, 2006, 9:45 pm


zxcvbob wrote:
> When two pieces of backer board meet at an inside corner, do I leave a
> little gap, fill it with thinset, then embed a strip of fiberglass
> tape like I would a wall seam? Or do I *not* use the tape, and
> (knowing it will eventually crack down the center of the joint) use
> caulk instead of grout where the tiles meet in the corner? Maybe I'm
> supposed to tape the corners *and* use caulk instead of grout?
>
> Thanks,
> Bob

Use the tape like its a drywall joint, put the tape on then imbed with a
nice coat of thinset press it into the corner so it keys the two pieces
together good when it sets. Just don't build up the corner thickness to much
because the tiles will not sit right.

Rich




Posted by RicodJour on December 20, 2006, 10:56 pm


zxcvbob wrote:
> When two pieces of backer board meet at an inside corner, do I leave a
> little gap, fill it with thinset, then embed a strip of fiberglass tape
> like I would a wall seam? Or do I *not* use the tape, and (knowing it will
> eventually crack down the center of the joint) use caulk instead of grout
> where the tiles meet in the corner? Maybe I'm supposed to tape the corners
> *and* use caulk instead of grout?

I thinset/tape the backer board corner, and color-matched caulk the
inside tile corner. Belt and suspenders.

R


Posted by krw on December 22, 2006, 11:29 am


ricodjour@worldemail.com says...
> zxcvbob wrote:
> > When two pieces of backer board meet at an inside corner, do I leave a
> > little gap, fill it with thinset, then embed a strip of fiberglass tape
> > like I would a wall seam? Or do I *not* use the tape, and (knowing it will
> > eventually crack down the center of the joint) use caulk instead of grout
> > where the tiles meet in the corner? Maybe I'm supposed to tape the corners
> > *and* use caulk instead of grout?
>
> I thinset/tape the backer board corner, and color-matched caulk the
> inside tile corner. Belt and suspenders.

That's always been my plan as well. Try to fix the backer board in
place, but allow the two surfaces to move in case it didn't work.
;-)

It's amazing how close the color matched caulk is to the color of
the grout.

--
Keith

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