[masraum]

Originally Posted by MikeSid

Are you sure about that?? My house was built in 1913 and has hardwood floors throughout. Both oak and fir. There is diagonal shiplap subfloor under every floor in my house.

I was expecting something like that myself, but when I pulled up the sink in the bathroom I was able to confirm that there's only one layer of wood in the bathroom.

This is a photo of one of the perforations through the floor for plumbing that was under a sink. There's only one 3/4" layer of wood.


The TnG runs East-West when looking at the floor inside the house. The floor joists run North-South, and then the primary support beams (4x6) under the joists run East West. When I look up at the bottom of the house from under the house, I can see the bottom of the 4" TnG going East-West. Our floor is only a single layer of wood. And it's surprisingly solid.