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Pre drill holes for coach screws?

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  1. #1
    1K Club Member paddyjoy's Avatar
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    Default Pre drill holes for coach screws?

    I need to put some m10 coach screws into an lvl, is there a specified size I should predrill the holes or do I just need to try a few sizes until I don't get any splitting?

    Thanks

  2. #2
    Resigned SilentButDeadly's Avatar
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    It's quite easy to twist off the head of your average coach screw these days...I usually pre-drill to the size of the shank between the 'blades' of the screw. And I've been known to use WD40 in the screw holes themselves..[hardly necessary for LVL].

    So I'd go with 8mm holes or thereabouts.
    Joined RF in 2006...Resigned in 2020.

  3. #3
    Community Moderator phild01's Avatar
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    Concerned that a coach screw is being used in line with the lvl layers. I would check the manufacturers detail. From what I have read, this is not recommended.

  4. #4
    1K Club Member paddyjoy's Avatar
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    Default Re: Pre drill holes for coach screws?

    Quote Originally Posted by SilentButDeadly View Post
    It's quite easy to twist off the head of your average coach screw these days...I usually pre-drill to the size of the shank between the 'blades' of the screw. And I've been known to use WD40 in the screw holes themselves..[hardly necessary for LVL].

    So I'd go with 8mm holes or thereabouts.
    Thanks I'll try a test run with 8mm tonight and see how I go.

    Quote Originally Posted by phild01 View Post
    Concerned that a coach screw is being used in line with the lvl layers. I would check the manufacturers detail. From what I have read, this is not recommended.
    Thanks Phil I hadn't noticed that mentioned anywhere in the details but I'll double check before I use them.

  5. #5
    Golden Member GraemeCook's Avatar
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    Quote Originally Posted by phild01 View Post
    Concerned that a coach screw is being used in line with the lvl layers. I would check the manufacturers detail. From what I have read, this is not recommended.

    Good Morning Paddyjoy

    LVL has been around in the States since at least the seventies where I used it under the name of microlam. My memorery is that you can screw into the face timber, but must bolt through the edge-grain. Quite specific fastening rules were available, so I agree that you should check with the supplier, as Phil recommended.


    Quote Originally Posted by SilentButDeadly
    ....I usually pre-drill to the size of the shank between the 'blades' of the screw. And I've been known to use WD40 in the screw holes themselves.....
    Me too. In fact, I grab the nearest available lubricant - CRC, oil, grease, lanolan, cooking oil, butter, soap, detergent, whatever .... Lubrication is really necessary when I buy crap screws from BigChains!




    Fair Winds

    Graeme

  6. #6
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    I think the guide is you need to go "through" 3 laminations, check tho' as suggested.
    Lashings will continue until morale improves.

  7. #7
    1K Club Member paddyjoy's Avatar
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    Thanks guys, strangely I can't find anything in the hyspan LVL technical manuals however I feel safe doing this as I will be going into the face and will be going through about 10 laminations.

  8. #8
    Community Moderator phild01's Avatar
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    The smart frame have a very extensive literature set for their product and if it is anything to do with structural fixings, well anyway, it is worth reading about.

    http://www.tilling.com.au/sites/defa...%20Details.pdf

  9. #9
    1K Club Member paddyjoy's Avatar
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    Thanks that's a really comprehensive document compared to the hyspan manual.

    Sent from my Nexus 5 using Tapatalk


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