I have a 25 year old, marine ply 31 footer, in which some cracks are
appearing in the deck (allowing drips to enter above my bunk). I presume
these are where the plywood sheets join - haven't removed any paint yet, so
I'm not sure. Simple question - is it usual for deck joints to be butt
joints, or do people use scarf joints? The former seems more likely if the
joints are always over some form of supporting rib.
TIA.
John.

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