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  1. #1
    Senior Moment Tony's Avatar
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    Default Question for the carpenters

    I'm re-laying a deck with 19mm Vitex hardwood. I'm using 60mm decking nails that are 3.15 mm dia. When pre-drilling the nail holes, what size drill should I use?

    And yes I know about nail guns and using screws instead, but this is what I'm stuck with.

    As always, all suggestions gratefully received.

    TIA
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  2. #2
    tweakedgeek tweak'e's Avatar
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    Default Re: Question for the carpenters

    6.1.1 FIXING METHOD
    Align profiles perpendicular to joists. Pre-drill all fixing holes, using a drill bit that is slightly
    smaller than the screw or nail shank, to reduce the risk of splitting and ensure a snug fit.
    Fixing placement for a 90mm wide board to be 12.5mm in from each edge of profile, and for a
    135mm, or wider, board, 15mm in from each edge of profile.
    Timspec Ltd recommends using stainless steel, countersunk twin thread decking screws for all
    decking profiles. Fixings must be long enough to achieve a minimum 30mm framing
    penetration.

    http://timspec.co.nz/download.aspx?i...5-1f5a267c967c
    Tweak it till it breaks

  3. #3
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    Default Re: Question for the carpenters


  4. #4
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    Default Re: Question for the carpenters

    I normally use 2 or 2.5mm, basically above 50% diameter, less than 75%.

    I don't recommend nailing hardwood however, but it seems you're stuck in your ways.

  5. #5
    Senior Moment Tony's Avatar
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    Default Re: Question for the carpenters

    Quote Originally Posted by Kame View Post
    I normally use 2 or 2.5mm, basically above 50% diameter, less than 75%.

    I don't recommend nailing hardwood however, but it seems you're stuck in your ways.
    It's not that I'm stuck in my ways. Half of the deck was re-done about 5 years ago and that was nailed, so I want the look to be consistent. I've just totally re-done another deck and there I used screws.
    Thanks for the advice.
    We are all but temporary files on the great HDD of life.

  6. #6
    Soaring like an Eagle gary67's Avatar
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    Default Re: Question for the carpenters

    Halfway down this page have a read of the PDF for Vitex. I normally use a drill bit just smaller than the nail, never measure them but if the nail says 3.2 on the box I just use a 3mm. Who has time on site for measuring that sort of stuff. Its carpentry not engineering.

    Here

  7. #7
    Senior Moment Tony's Avatar
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    Default Re: Question for the carpenters

    Quote Originally Posted by gary67 View Post
    Halfway down this page have a read of the PDF for Vitex. I normally use a drill bit just smaller than the nail, never measure them but if the nail says 3.2 on the box I just use a 3mm. Who has time on site for measuring that sort of stuff. Its carpentry not engineering.

    Here
    Absolutely right, but if I'm just setting things up and I have a container of sized drill bits available, I might as well use the most suitable size.
    We are all but temporary files on the great HDD of life.

  8. #8
    pcsourcepoint
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    Default Re: Question for the carpenters

    Can robertson screws be used? I seen a chippie use those square drive screws for quickly zipping them in with a drill driver on plywood floor board in our hot water cupboard. They can also be quickly removed...and I seen nails lift...unless if threaded...like screws
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  9. #9
    Senior Moment Tony's Avatar
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    Default Re: Question for the carpenters

    Quote Originally Posted by kahawai chaser View Post
    Can robertson screws be used? I seen a chippie use those square drive screws for quickly zipping them in with a drill driver on plywood floor board in our hot water cupboard. They can also be quickly removed...and I seen nails lift...unless if threaded...like screws
    On the other deck I used Titan double threaded decking screws that had a square (i.e. Robertson) drive. On this deck I am using decking nails that have annular grooves that help prevent lifting. The old deck I have replaced had ordinary galvanised nails and they were showing no sign of lifting (just the timber rotting. )
    We are all but temporary files on the great HDD of life.

  10. #10
    Soaring like an Eagle gary67's Avatar
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    Default Re: Question for the carpenters

    Quote Originally Posted by kahawai chaser View Post
    Can robertson screws be used? I seen a chippie use those square drive screws for quickly zipping them in with a drill driver on plywood floor board in our hot water cupboard. They can also be quickly removed...and I seen nails lift...unless if threaded...like screws
    Square drives are used pretty much exclusively in NZ over everything else. However a lot of the double thread decking screws are now a star drive. Square drives can be used in a collated screw gun as can phillips (used exclusively for Gib) usually Phillips No1 which is totally different to pozi drives.

    When I first came over the local builders kept telling me Pozi drives were crap, they rounded out etc, etc. Then I pointed out they were using Phillips bits got them to try my Pozi bits and they had to eat humble.

    Using a nail gun is a poor idea the boards often split and you need a soft nose sometimes called a decking nose on the nail gun.

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