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What is the maximum spacing between exterior deck boards?

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ltlyg

ltlyg

Structural
Aug 18, 2005
6
I'm using dried 4x12 timber planks on steel framing to make a commercial boardwalk / deck. I'm concerned that with timber shrinkage the gap between the planks might get too large. BUT, I cannot find a standard or code anywhere that gives a maximum spacing. Can anyone point me to a CODE or STANDARD for reference?
 
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Ask a carpenter for practical standard. I would imagine they use about a thickness of a nail or so. You should be able to figure expansion of the material. I would say a gap of 1/8" should be about right.
 
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