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Old 01-29-2008, 08:49 AM   #1
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When to tape the fiberock....?


I'm using Fiberock under my tile floor. After I thinset and screw the Fiberock down, should I tape the joints right away or should I wait until it dries and then tape and set tile at the same time?

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Old 01-29-2008, 10:06 AM   #2
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When to tape the fiberock....?


You can do it either way. When I used to use CBU's (only Ditra now), I would tape after the board was installed immediately if time allowed. Some people seem to have trouble with this method because they create "speed-bumps". So they prefer taping as they install the tiles. I don't like that because the tape gets disburbed when troweling the thinset.

What kind of room is this, how large? What type of tile? Ceramic, porcelain, natural stone? What type of adhesive are you using?

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Old 01-29-2008, 11:18 AM   #3
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When to tape the fiberock....?


Both good concerns. I had thought of the speedbump problem but not the disturbing when wet problem.

It's 6" ceramic tile, over ply, over fiberock, in a hallway. Was going to use modified thinset for under fiberock and for laying tile.

Maybe the sticky mesh tape over the joint, then the thinset when tiling. The sticky holds it down while I'm notching but the joint wouldn't be as strong as a mounded joint.

It's also interesting that USG isn't concerned about gaps in the field. They state, butt then together, not tight, but maximum 1/32 is ok.

From USG:

Laminate FIBEROCK underlayment
or tile backerboard to
minimum 5/8" thick exteriorgrade
plywood/OSB with
Type I organic adhesive, latex
portland cement mortar, or
dry-set mortar.


Butt panel edges and ends
lightly together. A maximum
1/32" gap is allowed.

Finishing Joints:

Prefill all joints with tile-setting
mortar or adhesive, then
immediately embed DUROCK
interior tape over joints.
Strike joints flush.
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