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2nd February 2015, 11:33 AM #1
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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2nd February 2015, 01:31 PM #2
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 ...
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2nd February 2015, 02:30 PM #3
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
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2nd February 2015, 08:21 PM #4Member
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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.
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2nd February 2015, 08:46 PM #5
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_p0915409The person who never made a mistake never made anything
Cheers
Ray
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3rd February 2015, 08:48 PM #6
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3rd February 2015, 09:59 PM #7Member
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5th February 2015, 07:20 AM #8
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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