Well, I'm about 3 years late to the party it seems.
This is my first winter with my 1980 CS 27 and I have just discovered the same problem with the same symptoms:
Water overflowed the bilge
to about an inch. Cockpit
was full of 2-4 inches of ice and snow, tarp didn't hold it out properly so it built up in the cockpit
Also, my upholstery was dry and there were no signs of water entry anywhere in the cabin.
main cabin storage
locker on the right had water, and it has a path between that compartment and the stern of the boat
under the cockpit, where i suspect the water entered.
The cockpit has no cracks or penetrations except for the two drains. I opened the cockpit storage locker and felt the drain fitting from the inside and it was wet. So i'm 99% sure it's that now.
Can anyone weigh in on whether I need to worry about there being a place that water could accumulate underneath the vinyl (or whatever) floorboards where they connect around the top of the bilge?
There is supposed to be a sealant
between the floorboards and the top of the bilge but that sealant
is shot and the space allows water entry, i'm just not sure where the water can go since it's tight and I dont want to rip up my floor if not necessary.
I chipped the ice out of my bilge and added antifreeze
to break it up, and pumped out all the water I could, but i'm worried that water got under the floorboards....