I had to replace a piece of subfloor and am now ready to cut and lay my plywood before laying vinyl tiles. My question is this: does the subfloor have to be leveled and filled or can I just lay my 1/4 plywood down and fill over nail holes then apply my vinyl tiles.
Here's what I've got so far tongue and groove subfloor then 3/4 osb over that and I am stuck as to the above.

Remember, the closer to level the easier it will be to lay out the laminate. I am not saying it needs to be perfect. Also give serious thought to glueing and nailing or stapling the subfloor down. I would also suggest a particle board for subfloor rather than a plywood. PB is more dense and smoother. The laminate glue will go on better.

Mischievous

Thank you for the reply. I am using plywood because the associate at menards recommended it instead of luan as he says luan excretes oils that get soaked up into vinyl causing a permanent stain. I spread a thin layer of filler over the uneven portion of osb and am going to paint my underlayment with mold and mildew paint after filling. Then I am using the sticky-back tile instead of all the other mess. Thanks again

Don't fill anything on the 3/4 subfloors for expansion purposes. On the 1/4 ply, butt joints tight, nail or air staple every 3" along seams, 6" in the field. Any discrepancies in the 1/4 can be filled and sanded smooth before tile installation