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  1. #1
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    Default LVL for decking bearers and joists - use with Kreg Deck Jig

    Hi everyone,

    I have decided to go ahead and use LVL for the bearers and joists on my replacement verandah / deck for a large number of reasons, but I am concerned that the joists may split since I am screwing into the "side grain". I will be using the Kreg Decking Jig to hide the screws. This jig pre-step-drills the decking bord, but doesn't pre-drill the joist - the screws are the type with the self-drilling head.

    I am concerned that not pre-drilling the LVL may cause it to crack / delaminate and allow moisture between the layers. Does anyone have any experience with this?

    Link to deck jig : https://www.kregtool.com/store/c24/d...deck-jigtrade/
    Link to screws : https://www.kregtool.com/store/c24/d...screws--700ct/

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  3. #2
    Join Date
    Jan 2011
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    Canberra
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    Default

    I can't work out how to delete this thread ... I have just got off the phone with my local timber yard and they have convinced me that I shouldn't use LVL for outdoor use - even though there are a number of threads on these forums that say that it is good stuff to use. I will be using treated pine rougher headers instead. It works out a lot cheaper too, and hopefully won't have the splitting issues I was concerned about with the LVL.
    ... now to go spend 4 years of savings on a truck load of timber ...

  4. #3
    Join Date
    Nov 2006
    Location
    Melbourne
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    Default

    You've got to used treated LVL's (H3 for above ground, but I stand to be corrected on that.) a timber merchant should be able to tell you that.
    As to that screw system, I am not familiar with it.
    TM

  5. #4
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    Jan 2010
    Location
    Brisbane Northside
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    Default

    100% no way would I use lvl outside. Look at scaffold lap boards. They're lvl and never last.
    Treated pine would be the go.

  6. #5
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    May 2012
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    Woodstock (Cowra)
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    Default

    H3 treated pine with Protectadeck membraine on top between decking and joist, wasting your time if you dont

    http://www.bunnings.com.au/protectad...joist_p0915409
    The person who never made a mistake never made anything

    Cheers
    Ray

  7. #6
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    Jan 2011
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    Canberra
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    Default

    Quote Originally Posted by rwbuild View Post
    H3 treated pine with Protectadeck membraine on top between decking and joist, wasting your time if you dont

    http://www.bunnings.com.au/protectad...joist_p0915409
    Awesome, I haven't seen that stuff before. I'll duck down to Bunnings and have a look. Thanks.

  8. #7
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    Jan 2010
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    Quote Originally Posted by rwbuild View Post
    H3 treated pine with Protectadeck membraine on top between decking and joist, wasting your time if you dont

    http://www.bunnings.com.au/protectad...joist_p0915409
    I see the logic in this stuff. But after 10 years I've only ever been back to replace 1 deck and they insisted I put this on the joists and it rotted the decking boards out.

  9. #8
    Join Date
    Jan 2011
    Location
    Canberra
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    Default

    Yep, the sawmill just confirmed that for me. Apparently the decking membrane fills the gaps/ridges under the decking boards (that are there deliberately to allow air flow) and traps the moisture both between the bearers and the decking, causing it to rot out prematurely. I think I'll just paint extra preservative onto the tops of the bearers and see how it goes.

    Thanks for your input everyone

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