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We have a concrete floor with linoleum tile. We will be leaving the tile in place. Should we glue the new engineered wood or put down a subfloor and nail the engineered wood into place? If a subfloor is the way to go, what type of plywood is recommended?

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    If this is a floating floor, no nailing or glueing. If it is not a floating floor, see what the instructions say about adhering the flooring. – Jeff Cates Mar 4 '17 at 7:17
  • Have you already purchased the flooring or have you selected what you plan to buy? – Jim Stewart Mar 4 '17 at 15:12
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Either can be made to work, but both have challenges. Wood floor on slab is not a happy combination unless you prep the surface really well. And even then it has downsides, eg in winter the floor will be extremely cold. On the other hand, nailing the boards to a ply subfloor will give you great results, but you might have to fix every door, doorframe, base board, transition step and so on in the space to accommodate the raised height of the floor.

I would be confident that gluing to the slab can work really well, but much less so that gluing to linoleum would not eventually fail. Although it's an ugly job, stripping the lino off the floor would be my recommendation if you go this path.

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If you are going to leave the tile I would glue the floor. If you installed a subfloor you would have to glue it to the tile and fasten it to the concrete. You have less chance of movement and buckling just installing the floor to the tile with glue and a lot less money and time.

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