Quote:
Originally Posted by gregpark
Anything between the floor covering and the subfloor we call underlayment.
I always considered a girder as one central larger beam supporting lesser beams which support the joists? Just semantics? who cares? everyone knows what you're talking about when you mention beam or girder
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Yes on the girder. A 2nd layer of support would always be a girder. But break the floor joists over a beam and the semantics do get in the way. The only place my floor joists break are over a stem wall with cripple studs (built 1930).