Lift up and remove damaged section

Step 5:

Using the hole you drilled earlier, pull the damaged section out.  If the circular saw didn't get all the way into the corners, use a handsaw or an angle grinder with a wood cutting blade.  When you have the section out, inspect the floor joists.  If they appear to be rotten or damaged in any way, stop and call a professional.

Screw down existing sunflooring

Step 6:

(This step is optional but recommended, especially if you are going to install tile.) Using an appropriate material (2x4's are ok but use 2x6's if you can) frame a small box that will fit into the hole.  This will support the two sides of the patch that do not land on the joists.  Run a bead of construction adhesive on the floor joists and screw the support frame in between the joists.

Apply construction adhesive

Step 7:

Using the piece you cut out as a pattern, cut a replacement.  This replacement should be of the same material that you removed.  At least the same thickness material as you removed.

Run a bead of construction adhesive around the perimeter.

Screw down patch

Step 8:

The patch needs to be screwed in place. Do not just nail it down.

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