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Author Topic: pine floor ok to put down green  (Read 576 times)

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Offline fivedogs

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pine floor ok to put down green
« on: August 22, 2017, 05:31:20 pm »
hi everyone  I have  a short question

is it ok to put  a pine floor  down  green  in a barn. we are   finishing  our  wood shop  part  of the  barn and  all we have left  is pine  logs
 can I cut planks   2x8 or2x10and put them  down  green

 my  concerns  are  mold,   shrinkage  I can  live  with .  I would  use  timber locs to secure them   

thanks  for any  feedback I really appreciate it

fivedogs

Offline Don P

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Re: pine floor ok to put down green
« Reply #1 on: August 22, 2017, 05:50:31 pm »
If you have the airflow you won't have mold. Not to worry, you will have shrinkage, with rigid screws and wide boards you may have splitting too.

Offline classicadirondack

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Re: pine floor ok to put down green
« Reply #2 on: August 30, 2017, 10:15:01 am »
I would think about shiplapping the edges

Offline MbfVA

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Re: pine floor ok to put down green
« Reply #3 on: August 30, 2017, 12:15:53 pm »
Don, wood the same cautions about splitting apply to Oak and related hardwoods?
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Offline Ianab

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Re: pine floor ok to put down green
« Reply #4 on: August 30, 2017, 02:24:18 pm »
Don, wood the same cautions about splitting apply to Oak and related hardwoods?

Oak and most other hardwoods shrink more than pine as they dry. This would make the gaps and chance of splitting worse.
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Offline MbfVA

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Re: pine floor ok to put down green
« Reply #5 on: August 30, 2017, 02:29:57 pm »
Learning here, thanks Ian and Don, hope I am not hijacking the thread.

If I let the logs dry to about 20% (the logs I just finished practicing on with my mill were at that avg level after being out in the open for years, according to my moisture meter) would that reduce the chances of problems  sufficiently, or do we need to go farther than that, or simply fall back on milling first and then letting the wood dry?

Of course I'd paint the log/board ends.
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Offline Brad_bb

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Re: pine floor ok to put down green
« Reply #6 on: August 30, 2017, 03:11:22 pm »
I'd air dry them down to ambient - 15% and I would put a lap joint or t&G.  Only if you were really pressed for time would I use them at 20%.  Probably 6 months to a year to get to 15% would be my guess.  I'm not a pine expert.  I wouldn't do this with hardwood.  I'd want it to be down to 15% for sure before using them.

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Offline MbfVA

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Re: pine floor ok to put down green
« Reply #7 on: August 30, 2017, 04:32:46 pm »
Either that, or I better crank up the kiln I don't have yet. Thanks for setting me straight on that folks. All this has to go into the planning &  timing on our build.
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Offline Stuart Caruk

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Re: pine floor ok to put down green
« Reply #8 on: August 30, 2017, 06:22:03 pm »
I used green 2" x 7" for the 1st and 2nd floor of my daughters tree fort, nailed down green. They shrunk on the edges and left 1/4" gaps or so, but mold wasn't an issue. Now that they have dried for a year or so, I'm going to use deck cleaner on them and stain them. A couple nails came loose, but that's on the boards that I inadvertently stuck with the grain the wrong way and they curled up on the edges.
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Offline Don P

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Re: pine floor ok to put down green
« Reply #9 on: August 30, 2017, 09:22:33 pm »
Some more wood stuff, wood doesn't begin shrinking until it begins dropping below fiber saturation point, around 28% for most woods but as low as 20% for some. Above that point the free moisture that is leaving is just water in the cell cavity. As the bound water that is within the fibers of the cell walls leaves, only then do the fibers move closer together and shrinkage begins. So one way to think about it while reading the shrinkage tables is, if they are saying the species averages 8% tangential shrinkage from green to oven dry do not think that at 20% you have undergone 4/5 of the shrinkage from 100% to oven dry, rather think "I'm about halfway between 28% and 12%". In an open shed here in VA you will reach equilibrium moisture content around 12% just air drying. The lower parts of a barn without critters would be similar, as you go up there is more heat so lower RH and a lower EMC. I move shed dried wood to the upstairs of the barn to drive off a little more moisture. If it has a dirt floor and critter moisture the RH and EMC will rise. In my house in the winter wood will bottom out around 8%. Drying rate depends on species, RH, temp and airflow. 1" pine shed drying will be at emc in the summer in a few months with good airflow, white oak will get there the next summer.

Offline MbfVA

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Re: pine floor ok to put down green
« Reply #10 on: August 30, 2017, 11:28:24 pm »
I used green 2" x 7" for the 1st and 2nd floor of my daughters tree fort, nailed down green. They shrunk on the edges and left 1/4" gaps or...

What wood species is that?
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