How to Install Subfloor
Learn how to install subfloor with our detailed step-by-step guide. Follow our easy instructions to get it done right.
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0 of 6 steps completedStep-by-Step Instructions
1 Step 1: Inspect and Clean Joists
Step 1: Inspect and Clean Joists
Check that joists are level, dry, and in good condition - repair as needed.
2 Step 2: Snap Chalk Lines for Layout
Step 2: Snap Chalk Lines for Layout
Mark joist centers on rim joists, snap chalk lines across joists for panel placement.
Chalk Line
Chalk line tool for marking joist layout
3 Step 3: Apply Construction Adhesive
Step 3: Apply Construction Adhesive
Run bead of subfloor adhesive along each joist before laying panels.
Subfloor Adhesive
Construction adhesive for bonding subfloor (tube)
4 Step 4: Install Subfloor Panels
Step 4: Install Subfloor Panels
Lay 3/4-inch tongue-and-groove plywood or OSB perpendicular to joists, stagger seams.
Tongue-and-Groove OSB
Subfloor panels for floor decking (4x8 sheet)
5 Step 5: Fasten Panels to Joists
Step 5: Fasten Panels to Joists
Screw panels every 6 inches at edges, 8 inches in field - use subfloor screws.
Subfloor Screws
Coated screws for securing subfloor (5-lb box)
6 Step 6: Fill Gaps and Sand High Spots
Step 6: Fill Gaps and Sand High Spots
Fill panel gaps with wood filler if needed, sand any high edges for smooth surface.
Floor Sander Rental
Belt sander for smoothing subfloor (per day)