I am building a custom steam bath in a spa for a client. The ceiling has a wave detail. We have created webs to create the shape of the wave and then are running lath (1/2″ plywood) spaced 1/4″apart over the webs. The next step was going to apply diamond lath and a masonary product over the ceiling and then tile. I am concerned about any moisture from the steam bath creating rot and mold. We were going to spray foam with polyurathane from the top down to insulate and provide a vapor barrier.
Any suggestions would be appreciated
Replies
Rather than running plywood lath, which may not have the proper flexablity as you require, have you considered wiggle-ply? It comes with the grain in the length or width direction. Each flexes/ bends in one direction only. This will also create a more uniform bend.
I would apply a vapor barrrier. There will be a lot of condensation on the ceil, which will drip to the ceiling low point due to the wave. Though it is working against gravity, moisture may permeate through. The best place to pose this question is on the John Bridge website.
http://www.johnbridge.com
or
http://johnbridge.com/vbulletin/index.php
F
Thanks for the information. I have posted a thread on the John Bridge forum.
We did discuss wiggle board but were concerned that there would not be enough surgace for the masonary to bond to on the ceiling.
Huh? A continuous sheet of wiggle board has LESS surface area than plywood lath? You would still apply the wire lath, however now you would have a more stable surface to attach it.F
I had a site meeting with a stucco and masonary contractor and he suggested using 3/8" cement board. After seeing the radius of the curve he thought it should have the ability to follow the webs in the ceiling. In this case I would not use the wire lath. We are insulating with Roxul, applying lath strips, vapor barrier (6mm poly), sealed with accoustical caulking and and then screwing the concrete board(dura rock) up with large head screws. We will apply silicone over the screws because we have penetrated the vapor barrier.
Thanks for your information.
Mike
Please posts photos of the lath structure during construction. I am not clear on the wave form and the lath strips and web arrangement. Looking forward to seeing the process.I am also surprised the 3/8" cement board has the flex you describe. Hmmm....Frankie
We use two layers of 1/4 inch cement board glued to the other. They bend easier and when bonded give super strength.