cupping


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Old 09-18-02, 12:36 AM
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cupping

Isn't cupping of pt deck boards directly related to their length. I mean 2 four ft's instead of one 8 ft have less cupping, right? Of course, I would stagger them.


By the way, I know of a deck built with 2X6 non-pt wood ( I think ) and stained really well that held up better than what I am reading about pt wood.
 
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Old 09-18-02, 08:55 PM
josh1
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cupping is related to width not so much length. Longer boards will give more noticeable movement though so butt joints will open and swell closed more than shorter lengths.

hope this helps _Josh
 
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Old 09-19-02, 01:31 AM
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cupping is related to width not so much length

Sorry about that. I got a little mixed up with my terms here. It hit me as soon as I seen I had a reply to this post. I meant bowing and the effects of shrikage.
 
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Old 09-19-02, 04:36 AM
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Boman,
"By the way, I know of a deck built with 2X6 non-pt wood ( I think ) and stained really well that held up better than what I am reading about pt wood."

Not likely! PT wood will repel more water, exand and contract less, and is not usually bothered by wood boring insects.
Standard SPF lumber (spruce,pine,fir) is going to rot if installed outdoors.

fred
 
 

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