In article ,
says...

"Jack" wrote in message
...
On Jul 20, 4:11 pm, John H wrote:
On Tue, 20 Jul 2010 12:10:34 -0700 (PDT), Tim
wrote:
I was wondering abotu using salt-treated plywood on the Marquis deck.
I'm not a feared of paying for marine grade, but Jimmy the carpenter
told me that the newer salt treated woods are about as worthy as
marine grade at a fraction of the cost. So, what's the opinion?

I'm even wondering abotu using hybrid decking like you'd use on a
porch. synthetic mylar etc mixed with wood. The stuff is weather
resistant as all get out!

Does the composite stuff come in sheets, or were you going to use boards,
like
this:http://tinyurl.com/29auaun

I'm thinking of resurfacing my deck with that stuff. Expensive stuff
though.
--

John H

The beach house we have access to in Hilton Head has that on the
walkway to the dunes and on the deck that sits on the dunes at the
beach. It's at least 15 years old, and still looks great.

Only problem is that they have sagged in places between the joists
holding them up, worse than a wooden board would have in the same
situation. They seem to need a little more support? Might be worth
talking to a local professional about that.

Needs double the support. And depending on the batch, there are failures
also. My buddy got replacement for his Trex last year. I am in the process
for a new deck from Trex myself. They had a bad plasticizer for a few
years. Unfortunately they replace the deck material but not the labor or
the $330 were of deck screws required.


Man, I have seen a lot of that stuff that walks a mile with temperature
chage. I think it was Dick that had a whole thread about it a while
back, I think he had a good experience with it...

--
Rowdy Mouse Racing - We race for cheese!

In article ,
says...

"Wayne.B" wrote in message
...
On Tue, 20 Jul 2010 19:18:27 -0400, Larry wrote:

It's likely Trex if it's that old and that is recycled plastic and wood
fiber. It will certainly expand with the heat. The joists should be on
16" centers for the 5/4" boards. Closer (12") for commercial
applications.

Just my 2 cents worth but I'd be concerned about the weight. 3/4 inch
plywood is much lighter, probably less than half. Decent plywood
properly sealed with epoxy or good paint will last a long time.


My deck of PT ply with Nautolex lasted 15 years. Was not marine as did not
need the strength of no voids. I would use marine on a transom but not
necessarily on the floor. I replaced my deck with ACX PT. 5/8th I think.
But been a couple years.

Oh, missed it. Didn't know you were talking about floor... I think
marine is pretty soft, would probably sink down between joists even...

--
Rowdy Mouse Racing - We race for cheese!

"Califbill" wrote in message
m...


"mmc" wrote in message
ng.com...

wrote in message
...
On Tue, 20 Jul 2010 12:10:34 -0700 (PDT), Tim
wrote:

I was wondering abotu using salt-treated plywood on the Marquis deck.
I'm not a feared of paying for marine grade, but Jimmy the carpenter
told me that the newer salt treated woods are about as worthy as
marine grade at a fraction of the cost. So, what's the opinion?

I'm even wondering abotu using hybrid decking like you'd use on a
porch. synthetic mylar etc mixed with wood. The stuff is weather
resistant as all get out!


I looked at everything when I decked my pontoon boat 20 years ago. We
had a Wolman plant here at the time and they offered to pressure treat
any plywood I would bring them but the guy who ran the plant said PT
really only protects it from bugs. If water is your issue, save your
money. I ended up with MDO plywood (one side) and it is still going
strong after 20 years in salt water. That is basically 7 layer
exterior grade plywood with one MDF layer. You would probably have the
same luck with BC
The main thing is to be sure everything is sealed before you put it in
and seal all penetrations. The only bad spot I have found in my
current rehab is from an unsealed penetration.
Cut all of your pieces to size, paint them on all 6 sides with 2
coats then install them. Paint it again to cover the screws. Bristol
Palin will be running for president before that plywood goes bad.

I worked on a sailboat once that had a PT plywood sole and where it met,
the aluminium mast was badly pitted.
I thought it may have been caused by the cyanic acid?


Nope, the copper is not friendly to aluminum in a wet inviroment.
Is ther copper in pressure treated plywood?

"mmc" wrote in message
g.com...

"Califbill" wrote in message
m...


"mmc" wrote in message
ng.com...

wrote in message
...
On Tue, 20 Jul 2010 12:10:34 -0700 (PDT), Tim
wrote:

I was wondering abotu using salt-treated plywood on the Marquis deck.
I'm not a feared of paying for marine grade, but Jimmy the carpenter
told me that the newer salt treated woods are about as worthy as
marine grade at a fraction of the cost. So, what's the opinion?

I'm even wondering abotu using hybrid decking like you'd use on a
porch. synthetic mylar etc mixed with wood. The stuff is weather
resistant as all get out!


I looked at everything when I decked my pontoon boat 20 years ago. We
had a Wolman plant here at the time and they offered to pressure treat
any plywood I would bring them but the guy who ran the plant said PT
really only protects it from bugs. If water is your issue, save your
money. I ended up with MDO plywood (one side) and it is still going
strong after 20 years in salt water. That is basically 7 layer
exterior grade plywood with one MDF layer. You would probably have the
same luck with BC
The main thing is to be sure everything is sealed before you put it in
and seal all penetrations. The only bad spot I have found in my
current rehab is from an unsealed penetration.
Cut all of your pieces to size, paint them on all 6 sides with 2
coats then install them. Paint it again to cover the screws. Bristol
Palin will be running for president before that plywood goes bad.

I worked on a sailboat once that had a PT plywood sole and where it met,
the aluminium mast was badly pitted.
I thought it may have been caused by the cyanic acid?


Nope, the copper is not friendly to aluminum in a wet inviroment.
Is ther copper in pressure treated plywood?


Yup. Used to be copper arsenate (CCA). Now it is a copper only solution.
http://www.strongtie.com/productuse/PTWoodFAQs.html

wrote in message
...
On Wed, 21 Jul 2010 13:26:01 -0400, "mmc" wrote:

Nope, the copper is not friendly to aluminum in a wet inviroment.
Is ther copper in pressure treated plywood?

That is what makes it green
Chromated Copper Arsenate
I like the green too.

"Califbill" wrote in message
m...


"mmc" wrote in message
g.com...

"Califbill" wrote in message
m...


"mmc" wrote in message
ng.com...

wrote in message
...
On Tue, 20 Jul 2010 12:10:34 -0700 (PDT), Tim
wrote:

I was wondering abotu using salt-treated plywood on the Marquis deck.
I'm not a feared of paying for marine grade, but Jimmy the carpenter
told me that the newer salt treated woods are about as worthy as
marine grade at a fraction of the cost. So, what's the opinion?

I'm even wondering abotu using hybrid decking like you'd use on a
porch. synthetic mylar etc mixed with wood. The stuff is weather
resistant as all get out!


I looked at everything when I decked my pontoon boat 20 years ago. We
had a Wolman plant here at the time and they offered to pressure treat
any plywood I would bring them but the guy who ran the plant said PT
really only protects it from bugs. If water is your issue, save your
money. I ended up with MDO plywood (one side) and it is still going
strong after 20 years in salt water. That is basically 7 layer
exterior grade plywood with one MDF layer. You would probably have the
same luck with BC
The main thing is to be sure everything is sealed before you put it in
and seal all penetrations. The only bad spot I have found in my
current rehab is from an unsealed penetration.
Cut all of your pieces to size, paint them on all 6 sides with 2
coats then install them. Paint it again to cover the screws. Bristol
Palin will be running for president before that plywood goes bad.

I worked on a sailboat once that had a PT plywood sole and where it
met, the aluminium mast was badly pitted.
I thought it may have been caused by the cyanic acid?


Nope, the copper is not friendly to aluminum in a wet inviroment.
Is ther copper in pressure treated plywood?


Yup. Used to be copper arsenate (CCA). Now it is a copper only solution.
http://www.strongtie.com/productuse/PTWoodFAQs.html

Ah galvanic action. Good reason not to butt up to, bolt or clamp to
aluminum.
Thanks.

Wayne.B wrote:
On Tue, 20 Jul 2010 19:18:27 -0400, wrote:


It's likely Trex if it's that old and that is recycled plastic and wood
fiber. It will certainly expand with the heat. The joists should be on
16" centers for the 5/4" boards. Closer (12") for commercial applications.

Just my 2 cents worth but I'd be concerned about the weight. 3/4 inch
plywood is much lighter, probably less than half. Decent plywood
properly sealed with epoxy or good paint will last a long time.


I agree.

John H wrote:
On Tue, 20 Jul 2010 19:44:04 -0400, wrote:


On Tue, 20 Jul 2010 15:07:26 -0700 (PDT),
wrote:


On Jul 20, 3:11 pm, John wrote:

On Tue, 20 Jul 2010 12:10:34 -0700 (PDT), wrote:

I was wondering abotu using salt-treated plywood on the Marquis deck.
I'm not a feared of paying for marine grade, but Jimmy the carpenter
told me that the newer salt treated woods are about as worthy as
marine grade at a fraction of the cost. So, what's the opinion?


I'm even wondering abotu using hybrid decking like you'd use on a
porch. synthetic mylar etc mixed with wood. The stuff is weather
resistant as all get out!

Does the composite stuff come in sheets, or were you going to use boards, like
this:http://tinyurl.com/29auaun

I'm thinking of resurfacing my deck with that stuff. Expensive stuff though.
--

John H

John, this is the crap we used on our front porch. It faces the west
and gets all the harsh summer sun and the rain etc. We redid our porch
twice with treated tongue and groove pine and it was rotting in 5
years. Enough was enough. This stuff is extremely durable, looks and
feels and acts like wood. We've been satisfied for 10 years now.

http://www.ebuild.com/product-detail...rds/319691.hwx

So I was thinking of using this stuff decking the boat from side to
side instead of long ways from bow to stern.


Just a thought, though.

The problem with the Trex type stuff is the span is about 60% of what
you can get with the same size wood and it is heavy.
I have some as a ring around the base of my console and it does hold
up well but there is no span issue there.

I'm wanting to resurface my deck. The span would be about 18". Think that's
enough?

That's too far for composites like Trex. 16" is the absolute minimum.
They can sag with the heat.

Tim wrote:
On Jul 20, 6:14 pm, wrote:

Tim wrote:

I was wondering abotu using salt-treated plywood on the Marquis deck.
I'm not a feared of paying for marine grade, but Jimmy the carpenter
told me that the newer salt treated woods are about as worthy as
marine grade at a fraction of the cost. So, what's the opinion?


I'm even wondering abotu using hybrid decking like you'd use on a
porch. synthetic mylar etc mixed with wood. The stuff is weather
resistant as all get out!

And slippery as hell. Are you going to carpet over it? Starboard isn't
cheap but it's another option if you are using carpet.

Lar, this stuff we used on the front porch has a simulated wood grain
in the product, it really does look like wood.

while wet and with bare feet you couldn't slip on it if you had to.

That's the newer stuff. The old Trex was smooth and slippery.

wrote in message
...
On Wed, 21 Jul 2010 13:27:06 -0700, "Califbill"
wrote:

Nope, the copper is not friendly to aluminum in a wet inviroment.
Is ther copper in pressure treated plywood?


Yup. Used to be copper arsenate (CCA). Now it is a copper only solution.
http://www.strongtie.com/productuse/PTWoodFAQs.html


You can still get CCA lumber at a marine supplier.


I know, but at least here, could not find any in the San Francisco Bay area.
Maybe Oregon.