Deck Board Spacing

notesAugust 22, 2011

Using composite. Temps are in the 80s - low 90s. What spacing should I use between boards, both side by side and at butt joints. Manufacturer says 1/4", but that sure seems big to me. Plus, I hate it when they shrink up and the gaps get even bigger. Thanks.

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Composite doesn't shrink. It may grow in the heat. That is why the butt joint spacing is critical. Butt the ends tight and you'll end up with a wavy deck, if the sun shines directly on it.

Call the manufacturer and see if they'll warranty an install done with 3/16" gaps. I suspect they call for 1/4" to ensure maximum drainage and ventilation.

    Bookmark   August 22, 2011 at 2:51PM
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