We are going to tile our floor. What is the least toxic - removing the wood or tiling over the wood?
I have 7 year old glued down engineered wood. I am worried that the engineered wood and glue would continue to off gas even though the tile is placed over it, but on the other hand removing the wood would be such a mess and scraping the glue up and the dust would certainly be toxic too, right?
You cannot tile over wood. You need to set and fasten a cement or tile backer board for the floor to expand against and the tile to bond to.
Be careful you don't raise the level too much.
For more information:
Read "Is there a concern about formaldehyde or other toxins in either engineered wood or laminate flooring? I am thinking of replacing tile floor." a Q&A answered by Cynthia Phakos.