How to Patch a Wood Floor
The exact method may vary depending on the extent of the damage, but once the repair is complete, it’s best to sand the entire floor and apply a fresh finish. This will help ensure the new boards are indistinguishable from the old.
Step 1: Cut along the perimeter
In the area to be repaired, use an oscillating multi-tool fitted with a metal-cutting blade to make thin, vertical cuts through the flooring close to the walls. This helps free the boards without damaging surrounding areas.
Step 2: Pry up the loose boards
Using a hammer with a straight claw and pry bars, lift the damaged or loose boards from the floor. If the angled nails in the tongue side cannot be pulled out, cut through them carefully with the multi-tool.
Step 3: Install the subfloor
If there are holes or weak spots in the subfloor (such as those left by old vents or fittings), cover them with plywood or oriented strand board (OSB) of the same thickness as the existing subfloor.
Square off the opening with a circular saw, cut the replacement pieces to size, and secure them to the joists with screws, or to timber cleats fixed between joists.
Tip: Using splines
Flooring nailers drive angled nails that pull boards tightly together. If there isn’t enough clearance near a wall to use the nailer in one direction, you can reverse it. To do this, insert timber splines (cut on a table saw) into opposing grooves, allowing the reversed boards to be nailed while still achieving tight joints.
Step 4: Create a staggered joint pattern
Identify which existing boards need to be removed so the joints in the patched area are staggered in line with the surrounding floor.
Cut down the centre of each board using a circular saw set to the depth of the flooring. Then make clean, square end cuts with the multi-tool. Pry up the sections and remove any debris.
Step 5: Install the new boards
Lay a moisture barrier or builder’s felt over the exposed subfloor. Align the tongues of the new boards with the grooves of the existing flooring and gently tap them into place.
Using a pneumatic flooring nailer, drive angled nails through the tongues into the subfloor at intervals of approximately 400 mm.
Where space is limited, reverse the nailer and use splines as described earlier. In areas where neither method is possible, face-nail the boards using a brad nailer and 38 mm (1½-inch) nails.
Once the floor has been sanded and refinished, fill any visible nail holes with a colour-matched wood filler to achieve a seamless finish.
Source: www.ThisOldHouse.com
