Quote:
Originally Posted by Bill Douglas
Just for fun some other terms. The bits that run the other way holding up the floor joists are called bearers. And piles or foundations are the vertical supports that hold the bearers up.
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"Bearers" works for me. I've never heard it that way either, but we all know what a bearing wall is and a load bearing beam. Beam is the US word, but I'd understand you right off.
We also call them "girders" if they carry more like down the center of a floor system where floor joists are broken.
@gragpark is certainly right as he is the floorman here, but I sometimes think of underlayment as a lighter material. Lot's of 1/4" ply has been used over old floors. A full 3/4" ply layer can be subfloor laid over diagonal sheathing to me. It becomes structural nailed through to the joints. I've done that a lot. Then the cement board which is truly underlayment. It's all relative.