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I've been told that decking boards should always be installed "bark side up" so that the boards crown (and shed water) as they age rather than cup (and collect water). But then I've also heard that it should be done the other way around. And I've also heard that it just doesn't matter one way or the other - just put the "nicest" side up.

So, which way is best, or doesn't it matter at all?

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I had the same problem, but all my boards turned out to have at least one bad side, so it didn't matter… –  Vebjorn Ljosa Jul 27 '10 at 17:12
    
For reference - "Bark Side Up" is growth rings curving down and "Bark Side Down" is growth rings curving up. –  Daniel Ballinger Mar 6 '11 at 2:47
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2 Answers

up vote 8 down vote accepted

I would say crown side up and shed water. The deck that was on my house when I bought it was cup side up and is in horrible shape. That could be from the fact that the people never took care of it but being in a rather wet/snowy climate didn't help. I'm sure pooled water of any kind can't be good, even on treated wood.

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Although both ways are advised by different sources, I have built dozens of decks in Maine as a contractor and have found that pressure treated and cedar boards almost always crown to the bark side and recommend the bark side face outward. Obviously this helps shed water and doesn't collect ice in pockets in the winter. Don't mix the methods as this can result in a very unattractive surface after a couple of years. Always be sure to use treaded fasteners, never galvanized common nails and be sure to sink coated screws or stainless steel ring shank nails. make them flush or slightly below the wood surface to eliminate tripping hazards or use under deck clip systems. If you find some boards that have a bad finish on the side you want to expose, don't use them! Bring them back and have them replaced. This may sound like a pain, but flawed wood with checks or cracks will degrade very quickly and ruin all the hard work you have done on that expensive deck. Don't forget to water isolate the ledger from the building and resist the temptation to use cheap waterproofing products. Often the details of construction in areas you can't see is as if not more important than the viewed surfaces. Good luck.

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