Trying to mount my 75" tv and ran into a double wall. Starting from the room is 5/8" drywall, 2x4s 24"o/c laid on the flat side, vapour barrier, 6" gap and then the exterior wall. Will 4 lag bolts/screws hold up the weight of the mount and tv by only drilling into 1.5" of wood? Weight of TV and mount is approximately 130 lbs.


Yes, that's fine, assuming you pilot properly. You'd ordinarily only be going that deep into lumber anyway.

Pre-drill slightly smaller than the screw shaft diameter (not the threads).

  • ok thanks. My nervousness is because the instructions for the mount say the lags need to be drilled to a depth of 3.75"
    – kevbo
    Aug 3 at 20:22
  • You're welcome. Please take the tour to learn how to use this site.
    – isherwood
    Aug 3 at 20:23
  • Top tip to predrill a little small. Make sure everything is accurate, tight and cannot sag. Aug 4 at 8:26

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