Ok, so first off.

Use thicker plywood.

I wasn’t happy with how bendy and warpy this plywood was.

Also, use Tounge and Groove.  I’m not sure what I was thinking when I ordered this stuff, but clearly I wasn’t thinking about having a sturdy floor.


  • Align plywood along wall
  • cut last piece
  • use excess to start next row
  • (to make sure you..) overlap your seams so no seams are butting against each other
  • screw the plywood to it
  • don’t hit your radiant tubes!
Plywood Over Sand Mass Radiant Floor
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