We have completed extensive tabbing repairs and additions to our 1979 M382 Hull#115 -
Tabbing Repairs Photo Album. We owned and restored a 1966 Morgan 34 and expected similar construction in the M382. Not even close. The structural bulkheads in the M382 are tabbed intermittently to the hull. None of the bulkheads are tabbed to the deck above. Much of the cabinetry in the vessel we thought to be partial bulkheads (i.e. the forward face of the ice box and the panel below the quarterbeth) were not tabbed to the hull at all.
On Pilgrim, the repair work done by during the Morgan recall was shotty and non-effective. They installed the tabbing atop paint on interior hull rather than taking the time to sand off the original paint and properly bond the repairs to the hull. Most to all of their repairs on our vessel failed. Typically if a boat was serviced during the Morgan warranty it will have a removable panel below the seat in the shower and a retrofitted partial bulkhead for the port forward lower chain plate under the cabinet in the head.
We have now added tabbing between most of the bulkheads and the deck above. For the most part this will resolve the noise you are hearing. Long term flex in the deck can cause the outer fiberglass layer to separate from the core. This issue can also cause the creaking noise you are hearing. Inspect the area carefully.
We had issues with our head door closing. This was due to poorly installed fiberglass tabbing under the threshold detaching from the plywood support beam running from the Vee berth aft to the mast bucket. There are images of our repairs / modifications to this area in the previously shared photo album.
Another area to closely inspect is the bond between the sides of the keel and the floor of the bilge / top of the holding tank. Failure of this bond is common and can be difficult to remedy.
I realize my response to your query sounds very negative. I do feel these are well designed vessels. I am eager to finish up our refit of Pilgrim and hope to travel many miles safely aboard her. After spending many many many hours tearing apart and rebuilding our M382, I am unimpressed with the general build quality. I do feel it is similar to slightly better than many other comparable vessels of the same era.
I encourage you to check out our website -
M382Pilgrim.blogspot.com There are links photo albums from all of our repairs / modifications on the site.
Please let me know if you have other questions.