First step in log repair is a stroke of the chain through the 8" thick log at a depth of 4 1/4".

Snap the pieces out with a 5 lb hammer and crow bar.

Fastest way to chip out the remains if there is room to swing.

Fine tune now with air chisel to make near perfectly flat to accept new half-log.

On the very first log cut in the series, tilt chain saw up at the top of the log and down at the bottom due to rounded saw tip. (not pictured)

With 30-60 grit sanding disks on grinder, no surface to be painted or caulked can be left un-sanded.

Start to fade out the sanding as I blend into areas not being worked out.

Foam behind the logs for extra insulation. Non expanding and not too heavy as it will come out the inside if not careful.

Let dry overnight or 3 hours or so and trim with a knife.

Pre sand all new logs to be installed. Leave no surface on the front face (painted) or the top/bottom (caulked). Sand all wood not sanded in the last 72 hours again before installing.

This wood is only a few months old but this gray color will look bad under paint. Sand the surface lightly with high grit disk grinder just prior to installing. See where my sanding stopped?