What Preparation To Use On Plywood In Bathroom Before Putting Tiles Down?
I have 18mm plywood flooring (just laid) in my bathroom. I was wondering if I need to do anything to the plywood before I stick my tiles down on to it?
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Stonehenge Tile is Orange County's Floor Kitchen Bath Expert. From custom flooring installation, kitchen design & remodeling and custom bathrooms.
I m a bit confused and so are the other posters.( all but 1 any way by the time I wrote this) As I under stand it you put another layer of plywood down? Or is this the raw sub floor over the joists?
If it is another layer of a cement board is needed, thinsetted down and nailed or screwed well w/ 1 1/2 in galvanized nails. Now if your saying you added another layer of ply wood over the normal subfloor and your total thickness is a minimum 1 1/4 substrate you should put a ECB or waterproofing coating down to protect the wood and glue w/ a modified or latex thinset. Durock , Wonderboard and hadibacker and Denshield are 3 of1/2″ extra substrates you can use over a regular subfloor. ONLY hardi backer has a marked grid pattern to nail by.Any other question n you can e mail me thru my avatar and check my qualification there. GL
If you use Dura-Rock, Wonder Board, or other cementous backerboard on top of this now existing 18mm plywood you may be building up the subfloor to where you’ll end up with too much tile/finish floor elevation, thus creating too much of a transition between you new tile and existing floors elevation.
If the plywood is tight and presents no flex or movement you can liberally apply a masonry bonding agent to the plywood, effectively sealing the wood from future moisture penetration, and apply modified thinset and set your tile safely to the wood without worry of adhesion or future water damage to the subfloor.
When installing tile over wood, which I have done with great success, I apply a liberal coat of the bonding agent, making sure I seal any seams and edges, let it dry. Then apply a second coat and apply thinset or other tile adhesives when the bonding agent is ready for thinset/adhesive application.
Mike Lonergan
TradesProfessional, Inc.http://tradesprofessional.com
yes you need to put a layer of concrete board (i forget what its called but go to Home Depot they know what you need) down with mortar between the board and blywood. screw it down then you can tile.
especially in a bathroom where it gets wet you need the concrete board. if you don’t use it and water seeps through the seams or edges somehow it could rot. then you could have spongy floors and will be redoing it later.