Slip Joints in Steam Shower

[K_Tile]

Today, I was awarded a tile job, 1500sf new construction. The house has a steam room that already had the CBU installed by the drywaller (Seams not taped,yet). Reading the TCA (SR614-02) how important is it to have the slip joint in the ceiling b/n wall planes. Does it have to be a elaborate as shown with backing rods and sealant? Or can I just make sure that there is enough air space and caulk planes as normal walls.

Same question for the shower pan's expansion joint as shown in TCA.

I plan on using either Lat 9235 or Kerdi, whichever I have more of. I haven't seen Kerdi exactly listed for "steam rooms", is it rated for this use?

This is my first steam room, just wanna do it right!

[Dave Gobis]

To be technically correct, you need to put a joint there. I always did. Tub and tile caulk may or may not work, a sealant and rod are better. If you are using the Kerdi or 9235, you need to put a little extra fabric bent in a U shape in the joint before applying sealant. In new construction it shouldn't be a problem but make sure the shower has a few weeks to dry. If the drywaller hung the board, make sure there are enough fasteners. Seal all the penetrations with a backer rod and sealant.

[K_Tile]

"...enough fasteners." Thats funny you happen to mention that. When I got to the job there was a note in the steam room.

"Tile Guy, I ran out of nails...Please finish fastening."



Thanks for the advise