Results 1 to 6 of 6
  1. #1
    Join Date
    Jan 2006
    Posts
    153
    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
    1,172
    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
    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
    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
    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
    If Im re-enforcing walls, does CDX have more strength than sa..OSB? Or RDT?

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