1. a rough floor laid as a foundation for a finished floor
Usage: construction

Examples

• The contractor installed plywood subfloor before laying the hardwood.
• We discovered water damage in the subfloor during renovation.
• The subfloor must be level before installing tile.
• Squeaky floors often indicate problems with the subfloor.
• They used oriented strand board for the subfloor material.
• The subfloor provides structural support for the finished flooring.