Do I really need to use cement board on my wood sub-floor to tile?

[gc_level_17]

I'm ready to tile my kitchen soon. My husband and I have torn up the carpet and 2 layers of linoleum, leaving only some leftover glue from the linoleum and the wood sub floor. Do we really need to lay cement board over the wood sub floor or can we just go ahead and tile right on the wood?

(FYI: it will be either ceramic or porcelain tile)

[gwg24/7]

Yes, unfortunately you will. If you tile directly onto the sub floor, the tile is likely to develop cracks. The sub-floor is probably 3/4 material, so an additional 1/2 thick cement board should work.