?Use pressure treated plywood in marine constrution?
Ted Schirk
18' bowrider.
I'm thinking of using 3/4" pressure treated plywood painted with an enamel
paint.
Marine plywood and fiberglass would be better (& more $$) but impractical
for me to work with...
Any thoughts or comments would be appreciated.
teds...@rogersNOSPAM.com
Ken Kennedy
recommendation was not to use pressure treat plywood (sorry, the reason
escapes me). In any event, I think you would want to epoxy the edges to
minimize moisture infiltration.
If you use epoxy on all six sides, you are probably wasting money using
marine grade. "One Side Good" should be adequate.
kk
Pat Fusk
rear deck on my wooden fishing boat 5 years ago, constantly wet, boat is on the
water in service from May to November with fishermen and divers alike and no
problems so far , knock on wood.
nelson8077
water or
your bare feet.... Only thing I can think of...Just like they don't
recommend it for
around vegetable gardens.
Cheers,
Jeff
"Pat Fusk" <pat...@nb.sympatico.ca> wrote in message
news:3C3E20F4...@nb.sympatico.ca...
Ken Kennedy
> >
> This subject has been addressed in rec.boats.building. As I recall, the
> recommendation was not to use pressure treat plywood (sorry, the reason
> escapes me).
> Then Pat Fusk wrote
> > Would like to hear why pressure treated lumber should not be used,
Then Jeff wrote:
>
> I'm guessing it has something to do with the teatment leaching into the
> water or your bare feet.... Only thing I can think of...Just like they
> don't recommend it for around vegetable gardens.
That's It! (the reason that escaped me). As I recall, they were
especially concerned about the poison's effect on a cruiser in typical
cramped onboard accommodation. In addition, it was said to be not
"green" in general, to use pressure treat in a marine environment.
BTW, my dock is pressure treated lumber. Too cheap to use cedar, too
lazy to paint. Maybe the next time around, I'll do it the right way.
kk
thunder
> Would like to hear why pressure treated lumber should not be used, I
> re-did the rear deck on my wooden fishing boat 5 years ago,
> constantly wet, boat is on the water in service from May to November
> with fishermen and divers alike and no problems so far , knock on
> wood.
>
> Ken Kennedy wrote:
>
Pressure treated lumber uses CCA (Chromated Copper Arsenate), a
poison. This will prevent termites and other living things, but it
doesn't prevent problems with excess water. PT plywood will still
delaminate and has voids in the plies. Also, because the lumber is
treated under pressure, it is very wet = unstable. For the money,
there are other better woods to work with for boat construction.
William R. Watt
etc. MDO is often used for its smooth paintable surface. If the plywood
will be in more-or-less continuous contact with water most people who want
the wood to last would use marine or non-marine "encapsulated" in epoxy.
In any case the edges should be sealed with two coats of epxoy, polyester,
or some other goop to keep out moisture.
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Pat Drummond
> In addition, it was said to be not
> "green" in general, to use pressure treat in a marine environment.
>
> BTW, my dock is pressure treated lumber. Too cheap to use cedar, too
> lazy to paint. Maybe the next time around, I'll do it the right way.
If you love your kids, paint it. Next time, use cedar. The
chemicals used in 'green wood' should be illegal IMHO.
--
Pat Drummond
Boating in Canada http://www.ncf.ca/boating