The continuous structural surface laid directly over the floor joists to create a stable, flat platform. Usually made of OSB or plywood sheets, the subfloor handles the structural loads of the room and provides a solid, uniform base for attaching underlayment, hardwood, tile, or carpet.
Heard on the job
Glue and screw the subfloor tight so we don't get any callbacks about squeaky floors next year.
Also heard as
- subflooring
Do not mix it up with
- Subdeck: A subfloor is the interior structural layer under finished flooring, whereas a subdeck is used for exterior platforms or roofs.