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Old 07-17-2012, 04:21 PM   #1
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Vinyl Siding Over PT Plywood


I plan to cover the lower 3.5' of outside walls on a grill-house with vinyl siding (upper portion is screened). The walls are already sheathed with 1/2" pressure-treated plywood. Do I need to apply felt paper or other wrapping? I really don't see any benefit, but I've been told that I should.

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Old 07-17-2012, 06:38 PM   #2
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Vinyl Siding Over PT Plywood


Felt's cheap, keep the water off the ply, treated or not, unless it's actually marine grade plywood.

Even then "I'd" still paper it.

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Old 07-17-2012, 09:09 PM   #3
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Vinyl Siding Over PT Plywood


It probably won't help and deffinately won't hurt. 15 lb felt or red rosin paper would be cheap enough.
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Old 07-17-2012, 09:13 PM   #4
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Vinyl Siding Over PT Plywood


Your going to have to use stainless steel roofing nails to install it.
Galvinized will just corrode off.
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Old 07-17-2012, 10:00 PM   #5
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Vinyl Siding Over PT Plywood


Joe,that was an issue with ACQ,

MCQ [which has replaced it for most residential use]doesn't have the same issue
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Old 07-17-2012, 10:05 PM   #6
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Vinyl Siding Over PT Plywood


For the cost of a small box of nails is it worth guessing which one it is and having to do it over?
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Old 07-18-2012, 12:38 AM   #7
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Vinyl Siding Over PT Plywood


good point
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Old 07-18-2012, 12:38 AM   #8
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Vinyl Siding Over PT Plywood


Quote:
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grill-house
Never heard this term before. Definition?
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Old 07-18-2012, 09:18 AM   #9
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Originally Posted by mae-ling View Post
Never heard this term before. Definition?
My "grill house" is just a 10'x14' building where we have a couple of grills, a small refrigerator, sink for cleanup and some counter space. I guess it could be called an "outdoor kitchen" but IMO that implies something a bit more elaborate. We used to have the grills et al under a roofed (but otherwise open) patio but I got really tired of cleaning bird poop off everything, so that's why this structure has screen walls.
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Old 07-18-2012, 09:36 AM   #10
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Vinyl Siding Over PT Plywood


Quote:
Originally Posted by joecaption View Post
Your going to have to use stainless steel roofing nails to install it.
Galvinized will just corrode off.

Stainless steel and copper fasteners are both virtually immune to corrosion, but get pricey pretty quick. However, it's only a pound or two of siding nails, so price really isn't a problem.

As for galvanized nails, I learned that plain old galvanized fasteners simply aren't designed for the increased level of corrosion, and could fail in a very short time. However, "hot-dipped galvanized" nails with a "G-185" designation (which refers to the thickness of the galvanization) on the package is supposedly OK for use with ACQ lumber.

But with all that said, I've got PT wood that's been in place for over 20 years, installed with galvanized nails (which may or may not have had that G-185 designation), and never (yet) noticed any corrosion problems. However, for this siding job I will probably use SS -- and I guess I will pick up a roll of felt today.
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Old 07-18-2012, 11:16 AM   #11
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Vinyl Siding Over PT Plywood


Hot dipped galvanized will work just fine.
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Old 07-18-2012, 12:11 PM   #12
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My "grill house" is just a 10'x14' building...
for the cost of less than 12 sheets of CDX ... I'd pull that PT plywood off.
Tyvek? sure. Vinyl? why not. I'd still prefer Hardie though.
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Old 07-18-2012, 03:22 PM   #13
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Originally Posted by TarheelTerp View Post
for the cost of less than 12 sheets of CDX ... I'd pull that PT plywood off...
It's actually only six sheets -- but considering the trivial cost of the proper nails there's no way I would pull the PT off just to replace it with CDX(!)
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Old 07-18-2012, 04:36 PM   #14
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Vinyl Siding Over PT Plywood


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It's actually only six sheets -- but considering the trivial cost of the proper nails there's no way I would pull the PT off just to replace it with CDX(!)
My concern is encapsulating (even old) PT lumber.
Maybe I've read too many threads by the safety weenies?
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Old 07-18-2012, 05:43 PM   #15
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Vinyl Siding Over PT Plywood


Quote:
Originally Posted by PPBART

It's actually only six sheets -- but considering the trivial cost of the proper nails there's no way I would pull the PT off just to replace it with CDX(!)
Why did you use pt?

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