I want my tile to extend into our walk in closet from the bathroom . I put a new sub floor in the bathroom (3/4 ply ) but don't want to rip out the T&G in the closet ( just a pain in the ). It's an old house with 1" T&G over the joist's .The closet is 5' by 8' and I was wondering if it would be okay to put down 1/4" intergaply over it and then tile .

I think your spelling is off a bit. IntegraPly? According to their website, "IntegraPly™ is the only plywood underlayment recommended for use with floor and wall ceramic tile by The Tile Council of North America (Clemson University)".

I know that ,did you read my question ? Is it okay to be use over T&G flooring . I don't know if T&G flooring is a stable base or is there to much movement for tiling over even with The 1/4'" plywood underlayment .

Look at the IntegraPly website. Most likely they have a "contact us".