Title: How to Replace a Subfloor Under a Wall
Headings: How to Replace a Subfloor Under a Wall
How to Replace a Subfloor Under a Wall
Wall and Floor System Basics
Removing the Subfloor Under Walls
What You'll Need
Equipment / Tools
Instructions
Turn Off Electricity and Water
Remove the Baseboard
Remove Sections of Drywall
Remove the Floor Covering
Remove Any Underlayment
Cut Away the Nails
Cut Away the Subfloor
Remove the Subfloor From Under the Wall
Remove Subfloor From Other Side (Optional)

Content: For laminate flooring foam or felt underlayment, cut away a section with the utility knife. For 1/4-inch luan underlayment board, set the circular saw at the correct depth to cut only into the luan but not into any materials beneath it. Cut Away the Nails
Attach the metal-cutting blade to the oscillating multi-tool. While wearing eye and hearing protection, turn on the tool and insert the blade under the wall bottom plate. Cut away all nails that run downward from the bottom wall plate. Cut Away the Subfloor
Set the circular saw to the proper depth to cut only the subfloor but none of the materials below the subfloor. The circular saw cannot cut flush with the wall, so cut as close as you can get to it. Most circular saws will let you cut as close as an inch or two. Continue two more cuts with the hand saw along the side of the cut-out square until you reach the wall's bottom plate. Remove the Subfloor From Under the Wall
If the subfloor is heavily rotted out, you may be able to pull back on the remaining section of subfloor and remove it.