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1)Can you install marble tiles over Hardwood floor?If yes,
quote:Not if you are tiling directly on concrete (provided that the concrete is flat and level). If you have a wooden sub-floor, you really need to get some hardi-backer. It's about $9 for a 3'X 5' sheet.
2)Do you need a certain underlayment?
3)Will they break eventually?
If it were me, I'd just make sure I had 8 or 10 tiles left over when I was finished installing. Keep some of the grout and mortar that you used as well. You never know.
4)How can you prevent breaking?
5)What type of grout and adhesive should be use?
Other than that, it's a wide open field. I've used lots of different ones, and have been generally pleased with all of them. Just be sure that the mortar has about the same consistency as peanut butter. The grout should be about that thick as well. Don't mix more than about 10# of grout at a time. If you've never done it before, it'll start getting pretty stiff in the bottom of your bucket before you can use it all. Also, rubber gloves are a must for the grout. I don't know what the Ph is, but I'm guessing it's around 9 or 9.5 because it absolutely tears up my cuticles if I don't wear gloves.