A subfloor is the supporting layer beneath the finish flooring. It is part of an assembly that may also include underlayment, adhesive and other layers.
What this means at your property
After a leak, the visible floor may be dry while moisture remains below. Movement, swelling or deterioration in the support layer can also affect how a replacement finish performs.
What should be checked before new flooring is installed?
Ask for assessment of moisture, condition and suitability for the selected flooring system. The proposal should identify necessary preparation or repair and distinguish subfloor work from replacement of the decorative floor covering.