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  1. #1
    Join Date
    Jul 2008
    Posts
    46

    Default Is pre drilling cement board siding required

    do you have to pre drill cement board siding prior to installing a lag screw. If you don't pre drill what would happen.

  2. #2
    Join Date
    Sep 2012
    Location
    Boston
    Posts
    888

    Default Re: Is pre drilling cement board siding required

    installing a lag screw in almost anything requires predrilling. if you're "nailing" up cement board siding the answer is no, it does not have to be predrilled.

  3. #3
    Join Date
    Mar 2008
    Location
    nova scotia, canada
    Posts
    1,522

    Default Re: Is pre drilling cement board siding required

    if your gun nailing no it doesnt need to be pre drilled.. if your hand nailing you have to pre drill at the ends otherwise it will shatter
    fire up the saw and make some dust

  4. #4
    Join Date
    May 2008
    Location
    Pacific Northwet
    Posts
    1,418

    Default Re: Is pre drilling cement board siding required

    Since you're installing lag screws, you really want the screws to be biting into the wood behind the siding, since the siding itself isn't going to have the structural integrity to hold any weight by itself. So yes, you should predrill through the siding. The pilot hole through the siding should be equal to the outer diameter of the screw threads; the pilot hole in the wood behind should be equal to the inner diameter of the threads (or slightly smaller). Failing to at least predrill the siding could cause a blowout of the fiber cement product.
    The "Senior Member" designation under my name doesn't mean I know a lot, it just means I talk a lot.I've been a DIYer since I was 12 (thanks, Dad!). I have read several books on various home improvement topics. I do not have any current code books I can refer to. I was an apprentice plumber for two years.

  5. #5
    Join Date
    Jul 2008
    Posts
    46

    Default Re: Is pre drilling cement board siding required

    All,

    Thank you...One more question should i use a masonry drill bit.

  6. #6
    Join Date
    Sep 2012
    Location
    Boston
    Posts
    888

    Default Re: Is pre drilling cement board siding required

    yes, into the cement board.....no for the house sheathing

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