I'm in the process of repairing the tiles in my kitchen; I've not done a lot of this before but I thought it was going to be a simple job - pull the broken tiles (there's lots of them - probably about 50-60 tiles) and then cement new ones in; scrape everything and re-grout. The house is ~22 years old, the tile was apparently done in the late '80s.
Well, I'm starting to pull the old broken tiles.... but I found this weird underlayment - it's like corrugated orange plastic, with a white (fiberglass?) loose felt and polyethylene mesh on the bottom. It's been set down in a thin layer (~1/4") of a white substance, not thin-set because it's soft, breaking down and really dusty, more like plaster-of-paris. The tiles are set in white thin-set (not like the stuff underneath) on top of the plastic - see these pics (200KB each):
- the corrugations are full of air - so the tile is basically unsupported and breaks.
So, my question is, what do I do??? Does anyone have any experience with this "system", and if so, what is it supposed to be? Can it be salvaged, or should I pull up the whole floor and start again, turning a $100 repair into a $2000-4000 month-long project?
Right now, I'm kind of thinking of cutting out the plastic in 4X6' squares where repairs need to be made, putting down cement-board, and then resetting the tile over that. It won't stop the old tile from breaking, but with the right thickness underlayment it should look fine.
Any suggestions?? Thanks for reading!