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Exterior plywood for deck surface Rich 09-27-2006
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Posted by Rich on September 27, 2006, 9:52 pm
I want to replace my 10' X 10' deck boards with exterior treated plywood to
make the area under the deck water tight, I would .like to then put outdoor
carpet/astro turf on the deck. I then plan to enclose the area under this
deck with an enclosed area with vinyl windows and storm doors to extend the
seasons a bit. The entry into this new room from my house is from my walk
out basement out to the level where my pool is.

So the question is, will the plywood stand up over some years to being
almost flat and not delaminate etc.

Thanks, Rich




Posted by Tom G on September 27, 2006, 11:09 pm

>I want to replace my 10' X 10' deck boards with exterior treated plywood to
>make the area under the deck water tight, I would .like to then put outdoor
>carpet/astro turf on the deck. I then plan to enclose the area under this
>deck with an enclosed area with vinyl windows and storm doors to extend the
>seasons a bit. The entry into this new room from my house is from my walk
>out basement out to the level where my pool is.
>
> So the question is, will the plywood stand up over some years to being
> almost flat and not delaminate etc.
>
> Thanks, Rich
>
>
I would think the biggest problem is making the seams watertight. And I
found when redecking my pontoon boat that you can't apply carpet glue to
treated plywood and expect it to work. I would recommend regular decking
and then use the product that is designed to be installed under decking to
funnel the water out and onto the patio. My mother has this under her deck
and it remains dry in the patio area right under it. Kind of looks like
metal roofing like mobile home patio covers.

Tom G.



Posted by tbasc@bellsouth.net on September 28, 2006, 6:42 am

Rich wrote:
> I want to replace my 10' X 10' deck boards with exterior treated plywood to
> make the area under the deck water tight, I would .like to then put outdoor
> carpet/astro turf on the deck. I then plan to enclose the area under this
> deck with an enclosed area with vinyl windows and storm doors to extend the
> seasons a bit. The entry into this new room from my house is from my walk
> out basement out to the level where my pool is.
>
> So the question is, will the plywood stand up over some years to being
> almost flat and not delaminate etc.
>
> Thanks, Rich

As Tom G says, the problem is flashing edges and sealing joints.
TB


Posted by Wayne Whitney on September 28, 2006, 12:59 pm
> I want to replace my 10' X 10' deck boards with exterior treated plywood to
> make the area under the deck water tight.

I would suggest then that you are building a roof, so you should treat
the problem as a flat roof with a deck on top.

Cheers, Wayne


Posted by Tim Fischer on September 29, 2006, 1:18 am
Exterior grade plywood is water resistant, not water tight. If all it took
to make a watertight flat surface was some exterior plywood, you'd see lots
of roofs made out of that (and nothing over it).

-Tim



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