can Tongue and Groove plywood be used for installing a new sub-floor when there are walls already in place? (i.e. an existing home in use, not a new construction)

In other words: I've been told that T&G can only be used IF walls are not already in existence. Such as building a new home OR removal of all interior walls first, such as in a major re-model job.

But I just want to replace a bedroom floor area in a home with walls still in place.

As I re-read the comments, I'm seeing that everyone is referring to the actual top layer of flooring you walk on. I'm not talking about that at all. I'm talking about adding new "sub" flooring over the floor joists T&G "plywood sheathing".

1 Answer 1


Yes. I have no idea why someone would say that.

  • Exactly. Why wouldn't you be able to use it? May 4, 2015 at 19:19
  • @Paulster2 - no idea. Maybe someone installs it floating and nails down portion under the walls... I am just reaching but no clue. And obviously you don't float your subfloor.
    – DMoore
    May 4, 2015 at 19:21
  • I guess the reason they are saying this, is that it would be really difficult to connect them together where a wall comes into play. How do you tuck the plywood when you are at a corner of the room? And also when installing the final piece. I can't find one source on internet that talks about (or shows in a video) how you can lay down T&G in a room with 4 walls. anyone know a source online to review on this?
    – user37241
    May 4, 2015 at 19:41
  • 2
    You just cut out the T/G and nail it down. You are making this too hard.
    – DMoore
    May 4, 2015 at 19:49
  • ... and cover the transition with shoe molding.
    – keshlam
    May 4, 2015 at 22:48

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