Repair Subfloor Squeaks, Gaps, and Damage

A. Finished-Project Specification

Quantity: one defined repair area containing at minimum one loose panel corrected, one squeak corrected, one raised fastener set or removed, one minor nonmovement gap evaluated and filled where approved, and one localized damaged section cut to sound boundaries, blocked, and patched with a matching replacement panel.

B. Component Schedule

Component	Quantity	Material	Finished Size	Preparation
Replacement subfloor patch	1 per damaged section	Panel stock matching the existing subfloor grade, species category, and thickness identified in Project 01	Cut to the exact dimensions of the removed damaged section, measured after cutout	Dry-fit before fastening; orient face grain or panel span direction to match the surrounding subfloor
Edge blocking	As required at each unsupported cutout edge	Dimension lumber matching the existing joist depth and width identified in the framing review	Cut to fit tightly between existing framing members at each unsupported edge	Fasten to existing framing before the replacement patch is installed
Subfloor screws	Per the specified fastener schedule	Approved subfloor screw type for the panel thickness and framing condition	Length sufficient to penetrate framing per the specified fastener schedule without exceeding the concealed-service clearance limit	Countersunk flush without crushing the panel face

C. Material Takeoff

• Fasteners: subfloor screws sufficient for every squeak-correction location, the perimeter of the replacement patch, and the blocking-to-framing connections, per the specified fastener schedule.
• Patch panel stock: one piece of matching subfloor panel material sufficient to cut the replacement patch, with waste allowance for squaring the cut.
• Blocking lumber: dimension lumber sufficient to support every unsupported cutout edge identified during the damage removal step.
• Patch or filler: approved floor patch or filler sufficient to fill every identified nonmovement gap within the product's stated coverage limits.
• Documentation: one Subfloor Repair Log per repair area, plus photographs of joist verification, fastener locations, blocking, and the completed patch.

D. Fastener and Hardware Schedule

Joint	Fastener/Hardware	Installation Direction	Pilot Hole	Countersink	Final Seating Condition
Squeak correction (panel to joist)	Approved subfloor screw per specified schedule	Perpendicular through panel face into framing below	Required near panel ends per manufacturer instructions	Flush with panel surface, not below it	Panel drawn tight to joist with no visible gap or movement
Blocking to existing framing	Approved framing screw or fastener per specified schedule	Through blocking face into adjoining framing member	As required by fastener manufacturer for the framing species	Not applicable unless specified	Blocking seated tight against framing with no rock or gap
Replacement patch perimeter	Approved subfloor screw per specified schedule	Perpendicular through patch face into framing and blocking below	Required near patch edges per manufacturer instructions	Flush with panel surface, not below it	Patch surface flush with surrounding subfloor within the manufacturer's flatness tolerance

E. Acceptance Standards

Check	Standard
Fastener location	Every fastener installed into verified framing, with no fastener driven at an unverified or concealed-service-conflicted location
Squeak correction	No audible squeak or detectable movement remains at any corrected location when reloaded
Raised fasteners	Every identified raised fastener set flush or removed, with no crushed or torn panel face
Gap correction	Every filled gap confirmed as a nonmovement gap before filling; no movement gap, unsupported seam, or active crack filled with patch or filler
Patch plane	Replacement patch surface flush with the surrounding subfloor within the manufacturer-specified flatness tolerance, verified with a straightedge
Patch support	Every patch edge fully supported by existing framing or installed blocking, with no unsupported edge remaining
Documentation	Subfloor Repair Log complete with framing record, fastener locations, blocking locations, and patch dimensions

F. Framing Review and Preparation

1. Review framing direction, joist spacing, subfloor thickness, panel layout, concealed services, and approved repair details. Record this information on the Subfloor Repair Log before proceeding to Step 2.
2. Confirm the floor is dry and free of hazardous legacy flooring. Verify against the Project 01 Flooring-Readiness Plan before disturbing any surface.

G. Locating Movement and Verifying Framing

1. Walk and load the area methodically to locate squeaks, movement, and deflection. Apply body weight evenly across each section of the repair area and mark every location where a squeak or movement is detected.
2. Mark joist lines and suspect panel edges. Use chalk lines to mark each verified joist line completely across the repair area.
3. Verify joist locations using approved methods. Cross-check each marked line from at least two reference points before relying on it for fastener placement.
4. Identify plumbing, wiring, ducts, radiant heat, and other concealed systems below. Use available access points, plans, or an approved locating method to confirm the absence of concealed services along each planned fastener line.
5. Stop work if fastener length or utility location cannot be verified. Escalate to the stop-work decision authority identified in the Prerequisites before proceeding at that location.

H. Correcting Raised Fasteners and Squeaks

1. Remove or set raised nails, screws, staples, and other projections. Set nails below the surface with a nail set and hammer, or remove and replace failed fasteners, without crushing the panel face.
2. Add approved subfloor screws through the panel into framing at the specified locations. Drive each screw at a verified joist location identified in Step G.
3. Avoid overdriving and crushing the panel face. Set each screw head flush with the panel surface and stop driving at that point.
4. Confirm that the squeak is corrected. Reload the corrected location and listen and feel for remaining movement before proceeding to the next squeak location.

I. Evaluating and Filling Minor Gaps

1. Inspect minor panel-edge gaps and determine whether they require filling, support, or no correction. Distinguish a nonmovement gap from a movement gap, unsupported seam, or active crack per the Reference Conventions above.
2. Use only approved patch or filler in nonmovement gaps within product limits. Do not fill any gap identified as a movement gap or an indicator of unsupported movement.

J. Removing and Replacing the Damaged Section

1. Mark damaged material to sound, supported boundaries. Extend the marked cutout line beyond the visibly damaged area to the nearest point of full support.
2. Cut out the damaged section without cutting framing or services. Set the saw depth to the panel thickness confirmed in Step F and verify the cut path against the concealed-service locations identified in Step G.
3. Install edge blocking where required. Fasten blocking lumber to existing framing at every unsupported cutout edge per the Fastener and Hardware Schedule.
4. Cut a matching replacement panel with correct orientation and edge spacing. Measure the cutout opening directly and cut the replacement patch to match, maintaining the panel-edge spacing specified in the approved repair detail.
5. Apply adhesive only where the approved repair detail requires it. Do not add adhesive beyond the specified locations or in place of required fastening.
6. Fasten the patch to framing and blocking. Install subfloor screws per the Fastener and Hardware Schedule around the full patch perimeter.
7. Check patch plane, support, and movement. Verify the patch surface with a straightedge against the surrounding subfloor and confirm no movement remains when loaded.

K. Final Walkthrough and Documentation

1. Rewalk the repair area. Apply body weight evenly across every corrected location, including the replacement patch and every squeak-correction point.
2. Correct remaining squeaks, loose edges, and proud fasteners. Return to the applicable step above for any location that does not pass the rewalk.
3. Document fastener, blocking, and patch locations. Complete the Subfloor Repair Log with every fastener location, blocking location, and patch dimension before closing out the project.