First time posting. I am in the middle of a kitchen remodel and would like to lay porcelain tile thru the kitchen and foyer. Existing kitchen floor had 1/2"+5/8"+glued tiles+1/4" underlayment + sheet vinyl on it and the foyer had 1/2" + wire enforced mortar bed with ceramic tile. Everything has been removed back down to the 1/2" subfloor and that is where my question is. How to build it back up. Every tile store I visit gives me a different answer...from gluing & screwing more 1/2" to using 3/4" T&G. Schluter/Ditra gives very specific guidelines on how to add to a 5/8" or 3/4" subfloor but what if you only have 1/2" to start with? The joists are 2x10, spaced 16"OC and span 10.5'. Adjoining rooms have 3/4" oak. I know the tile will be higher but would like to keep the transition to a minimum. I appreciate any advice that will guarantee me a solid base for my tile.