0_Qed wrote in message ...
Backyard Renegade wrote:
...snip...

Ahhh, your guess makes more sense based on his origional
discription...

Not a 'guess' ... :-)
Several years in the Doug Fir plywood indy ... QC function ...
MS in Wood Tech too ...



I was thinking the wood was more swolen there because
of a void behind it, I did not think about overlapping.

:-)
Core "Voids" are yet another consideration ...


Yes, core voids is what I was referring to...



Still all in all sounds cosmetic.

- Core Laps -
Sorry ... not 'so', at all.

In a sanded panel ...
it seriously degrades the bending modulus along(with) the face_ply
grain...

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... I am also assuming that the
builder was aware of the defect 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..
Scotty from SmallBoats.com




'Fresh' out of the hot press ... hard to visually see

In sanded panels , a bit easier to 'see' ...
*if* you're familiar with samded face_ply wood 'grain' patterns .
Some core-laps in sanded 3/4" cause the face-ply to be
sanded =entirely= thru ...
primarily due to the 'construction' ...
face/back = 1/8" ven
2 cross plies, 1 center ply = all of 3/16" ven
ttl = 5 plies ; 13/16" +\-
Envision a laped 3/16" cross ply going thru a sander .

Most scarfed panels are =rigorously= inspected along the panel edge
for just such 'defect' ... panels are rejected =prior= to scarfing ...

Perhaps an 'exception' mite be un_sanded sheathing grades ...

Floor underlayment is not an exception ... esp "PTS" grades

HTH