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Discussion Starter · #1 ·
Hello,
I’m building an outdoor shower and using PT 5/4” x 6” decking board from HD which is not kiln dried. The inventory was a bit scarce, and I have some boards which are pretty dry (very light) and others which are very much wet. I’m located in NY if it matters for the climate. About how far apart should I leave the boards to account for shrinkage?
 

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Red Seal Electrician
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1,035 Posts
I was using framing nails as spacers. And you can fudge it a little as needed.

FWIW, narrower gaps will clog with evergreen needles. On wider gaps they'll fall thru, but
then be careful what deck furniture you can use.

EDIT: My boards were sopping wet when I got them. and the PT lumber I get here tends to warp a bunch. I installed immediately so they dried flat/straight in place.
 

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retired framer
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59,813 Posts
Get exact width of the dry and the wet if they have shrunk 1/4, and you want 1/4" spacing, then you do a layout and snap lines for the leading edge for each board What ever wet they have they should dry to the same gap.
 

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Naildriver
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16,978 Posts
Geeze, he is building a shower for cryin' out loud. Why all the shrinkage calculations for such a small area? When we use public showers hunting out west, the slats have just big enough of a gap to where your toes don't fall through. Of course, out there the water just goes into the soil.
 

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Premium Member
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3,891 Posts
Just re-decked mine and jammed them up tight. 8 weeks later, there is a 1/4 inch gap everywhere. Lumber was from a lumber yard and not the big box store.
 
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