SLC on plywood: theoretical question [Archive] - Ceramic Tile Advice Forums - John Bridge Ceramic Tile

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timo
06-27-2008, 11:35 AM
If the plywood underlayment expands and contracts, why would you want to encourage the SLC to bond with the wood?

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Sterving
06-27-2008, 12:38 PM
I believe the plywood is much more dimensionally stable than solid wood. The acrylic additive in the SLC provides bond strength and some degree of elasticity, and plywood should not expand/contract enough to crack the SLC over it. If you have a large area to cover with SLC, I believe an expansion joint may be needed. There is a reason plywood comes in 4x8 sheets and is installed with 1/8" expansion gap between sheets.

I am by no means an expert, and perhaps experts will chime in.

jadnashua
06-27-2008, 09:47 PM
Also note, that slc over plywood almost always requires lath for reinforcement.

timo
06-28-2008, 05:56 AM
Is the primer like a liquid rubber, and formulated to create a very elastic bond?