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  1. #1
    Join Date
    Jan 2006
    Posts
    153
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    Is CDX grade lumber and sheathing always pressure treated? I know OSB sheathing is glued partical Ply-board and RDT is a finer grade, but Im wondering about CDX more so. I think CDX is pressure treated to prevent rot and termits and such, so its a lot of expensive. Can anyone give me a better answer?

  2. #2
    Join Date
    Oct 2004
    Location
    Texas
    Posts
    1,176
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    CDX comes pressure treated or not. C and D is the grade for both sides and the x is for exterior use, meaning the glue holding the plys is rated for exterior use. Thats the best I can do for now, I may stand corrected though.
    Saddle Up!

  3. #3
    Join Date
    Jan 2006
    Posts
    153
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    Oh I see, thanks. Makes sense. Have you ever done any shear walling? Or underpinning? Thats the reason Im refering to CDX.

  4. #4
    Join Date
    Apr 2006
    Posts
    35
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    80GUGU is correct. I did a short term as a commercial carpenter prior to swapping to ac/r. Is 25years short term.

  5. #5
    Join Date
    Nov 2000
    Location
    Coastal Georgia
    Posts
    34,902
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    Keep all wood siding above the splash line on exterior. Getting it too close to the ground will make if go bad early.

  6. #6
    Join Date
    Jan 2006
    Posts
    153
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    If Im re-enforcing walls, does CDX have more strength than sa..OSB? Or RDT?

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