Backyard Renegade wrote:
....snip...
Core "Voids" are yet another consideration ...
Yes, core voids is what I was referring to...

'All things considered' ... :-)
voids arent as detremental as laps
BUT ...
in a 3_ply panel I'd not use it if the void( edgewize panel view )
was more than 0.75" x "panel_width", in a sanded 1/4" panel ...
Maybe make 'that' 0.50" ... :-)


When I suggested it was only cosmetic, I was taking into consideration
the idea that it had been in service for nearly 20 years with no
considerable degradation of the vessel...

On a larger hull ... 20' + ...
assuming UN_glassed exterior ... just painted plywood.

With out 'jigging' up the hull , torqueing it ... :-)
to see how the panel with the lap in it performed ...
I'd be leary of not repairing what I'd just discovered ... a lap.
Epoxy 'in' a backer panel, in side the hull ...
6" overlap, both sides of the core_lap , panel face 'grains in
same direction ... "AC" ext grade in same panel thickness


I am also assuming that the builder was aware of the defect

Not many folk inspect every edge, of every panel, going into a boat
hull.


and as many of us do now (with the
****ty plywood available today) carefully place these defects in areas
where they are not going to effect the strength of the boat or the
integerity of the structure itself..

Stick with Doug Fir(DF) plywood , exterior( marine grade ? ) ...
and mills that make 'scarfed' panels ...
Improves your chances of getting 'quality' panels ...
I'd even go so far as to locate an 'inland' DF mill source ...
as opposed to a coastal mill ...
"nicer" wood. :-)


Off -shore 'stuff' I dunno ...
I'd want to sample, & boil-test, the glue lines before I 'purchased'
for a boat hull .