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Old 08-03-2008, 07:40 AM   #1
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CDX Sheathing


This is probably a dumb question, but I don't trust the folks at Home Depot to tell me the correct answer: I am sheathing my 8x12 shed w/ 1/2in CDX plywood.
Is there an outside vs an inside orientation to the plywood?

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Old 08-03-2008, 12:06 PM   #2
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CDX Sheathing


CDX, means C grade one side, D grade the other, X means exterior grade glue. "A" being a premium grade... the C side (pine in this case) will be slightly better sanded than the D (also pine) which will be rougher and usually has more exposed knots. The core can be pine, poplar or sometimes hardwoods.

That being said, CDX is not exterior plywood, so they probably told you that it doesnt matter which way it goes. The smoother side will look better out mostly due to less knots and will finish with an exterior grade stain or paint easier.

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Old 08-03-2008, 12:14 PM   #3
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CDX Sheathing


Typically the C face is installed facing out. I don't think it matters all that much.

This type of plywood is not for exterior exposure, and should not be used as siding. It can certainly serve as a substrate for siding though.
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Old 08-03-2008, 01:25 PM   #4
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CDX Sheathing


I am using it as sheathing for my 8x2 shed; this will then be covered by vinyl siding - is this appropriate?
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Old 08-03-2008, 01:43 PM   #5
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CDX Sheathing


for a shed your fine... i would invest in some 15 or 30 lb felt over the plywood.... before your siding... if you have more Money then you know what to do with, you should use tyvek...
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Old 08-03-2008, 01:46 PM   #6
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CDX Sheathing


Actually I am going to use Tyvek - is it that much more? better?
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Old 08-03-2008, 01:54 PM   #7
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CDX Sheathing


,
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Old 08-03-2008, 03:12 PM   #8
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CDX Sheathing


I believe you are wasting your money for using tyvek. its just a shed. tyvek was designed for wind infiltration . your not going to install heat in the shed. For the price of a 9' roll @ 160.00 as per a roll of 15LB felt @ 20.00 it does not make sense. your going to need the felt for the roofing. so why not go the felt rout. BOB As for a face and a back side for sheathing waffer ply is the only one that has a face. which is the waffle side, the waxed side faces down to the framing.

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Old 08-03-2008, 03:24 PM   #9
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CDX Sheathing


I'd have to agree with buletbob on this, in terms of spending the money...go with the lesser grade material: Roofing Felt.
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Old 08-03-2008, 04:56 PM   #10
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CDX Sheathing


Agreed, Tyvek is completely unnecessary for this sort of space. Roofing felt will be perfect!
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Old 08-04-2008, 07:50 AM   #11
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CDX Sheathing


If I were siding it, I would save even more and use OSB for sheathing.

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