Thank you for posting
the pictures. How secure is the 2x6 to the keel
? Can it be removed?
I intend to do this repair when I haul the boat out in a few months and step the mast. One thought I had was to pull the compression post after removing the mast and to remove a section of floor directly under the bottom of the post followed by building some type of dam between the hull
and the underside of the liner I could then fill with structural epoxy
and chopped glass. Then I would repair the floor under the compression post and reinstall it. The idea is to keep the hole in the cabin floor the same size as the footprint of the compression post. FYI there is a 2x4 glassed against the inside the liner/bulkhead to the port side of the lower compression post and the if you look you'll see maybe a dozen screws with plugged heads attaching the lower section of the compression post to that short bulkhead. On my boat water
leaking down the antenna
and lighting wiring
coming out of the mast has partially rotted that piece of wood and I intend to drill and fill it with structural epoxy
as well. If the lower sill/track for the door to the head
can be fully supported against the bottom of the hull
it would provide additional support too. My guess is that the cabin sole
or liner was to cary the majority of the load of the mast but over time they flex mostly because the 2x6 support is not long enough to provide adequate support.