How to Air Dry Rough Cut Lumber
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- Опубліковано 18 жов 2024
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Checking on any warping issues with the air dried lumber. So far I am very impressed! This stuff will nearly tie in a knot if the sun can get one it, but by just keeping it out of the sun, it seems to be drying very well and staying very straight.
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Hi can I stack in the sun , covered and stickered properly.
Thanks , worried my shade spot has not enough wind and air .
Big city folk here, at the mercy of my local Lowe's. No kiln, just sun, and 3 days to let the big city sun shine on my boards. I take it they ain't gonna dry.
They'll surface dry, so you can sand or paint if you want, but no in 3 days they won't dry all the way through. Dimensional pine from Lowe's should be less than 17% I think, but it's definitely not less than 10%
Best to use boric acid is great for treating rough cut lumber , keeps insects away and prevention of mold . But a cheap sprayer from hardware store and container of boric acid , mix with water as recommended . Then just spray the lumber to treat .
So a few comments. If I heard you correctly, and you only dried this lumber for a week or two, thats not nearly enough. Generally speaking air dried lumber takes a year per inch to be considered dry. Depending on species, it may take longer or shorter. Even then, there is some risk if you are using in a conditioned home. Kiln drying dries the lumber below all reasonable humidity levels in a home and when it regains some moisture, it will acclimate to the area it’s in. I hope you haven’t used this stuff yet, for if its only a few weeks old, it will warp and split guaranteed.
You are comparing apples to oranges when you discussed the kiln dried 2x6 from the big box. This stuff is kiln dried, but it is taken down to about 20% or so before it is considered dry. The reason is due to its application, it is not intended to be milled and glued for a table top. 20% is fine for framework, not furniture. If you want to do this, you will need to dry it more to get to ambient moisture content. In my area, thats about 10% - 12% is the best we will get for air drying, and again there is a risk when placing these pieces in a heated/AC home if you do not allow for significant movement.
The lumber on top of the pile will always warp, no matter what because there is no pressure from the other lumber to keep it straight. If you let this dry as you should for a year or so, you will see much more movement from these top pieces.
Good luck with these projects.
It was a few weeks at the time of the video. It’s still stacked and drying right now. Pine dries pretty quick, more than an inch per year for sure. Thanks for watching.
Tom Brueggen True, pine and poplar are pretty quick. Glad to see you left it dry longer.
I agree with what you've said here
You may want to at least prime all sides after milling to seal the wood so moisture doesn’t come in from the untreated side/ back side as I’ve seen many times wood moves as the result of it. On every end of every board that goes up wood glue joints as well. Has worked great for me in the past.
Where bouts you located?
I’m on the north side of a hill in Washington state. It’s pretty wet out here. I’m just wondering if you think I can air dry out here?
Air drying is all about relative humidity. I’m in SE TX. It gets VERY humid here in the summer, like 80-90% humidity any given day. But air drying still works fine. Sure, lower humidity climates would certainly help. Air drying is slow at best no matter where you are. Maybe it’s quickest in the desert, but still can’t beat a heated or even vacuum kiln.
I see you have some mildew on your boards. I just started mailing my own lumber with a chainsaw mill. I’m really struggling to keep the mold or mildew off the boards. Is it unavoidable? Any tips for a newbie?
If you wash and kiln dry then I don’t know that mildew would be as much of an issue. Don’t confuse blue stain with mildew. Blue stain is a common fungus that feeds on the residual sugars in the wood. Doesn’t affect the integrity of the wood in any way. Can actually leave some really cool patterns in the grain like spalting in other woods. Most of the mildew is superficial and will clean off once you sand or plain, but I don’t worry about it. It’s just a reminder that it’s real!
@@TomBrueggen Interesting, mine is a blue stain as well. Does it go away over time?
Hey guys. Recently purchased rough cut lumber from mill for the first time. Did not know I need stack them with spacing. I put them directly on top of each other after one month I have realized they started mold ( blackish and some of them white) . I spaced them immediately but still mold are growing . Any idea to how to manage the situation. Thanks for any input.
I’m here looking for ideas. I am in the process of chainsaw milling cherry that came down. They aren’t big enough for a mill to come out so I’m doing it myself and learning as I go. I’m chainsaw milling so it’s taking time to do. Now I’m starting to stack. It’s going on the porch out of the rain.
I do know that weight needs to be on the stack to prevent warping and twisting.
I’m milling to 5/4 rough and 2 3/8 for the thicker milled stuff.
It’s interesting because all my years of woodworking I never got to do this.
It doesn’t take as much weight as you may think. When it comes to air drying, “wait” is more important. I didn’t put any additional weight on this pile, and the top boards which were unconstrained actually twisted very little. The real key for me is the keep the direct sun off. Direct sun will darn near tie these boards in a knot! Make sure your sticker boards are as close to uniform thickness as you can, and use more rather than less. If you want, tie a few ratchet straps around the pile to help constrain the top boards. Good luck on the cherry! I’m jealous!
@@TomBrueggen Thanks, I'm a bit sore from the milling and stacking. Plenty more to do over the next month. I'm looking at 1000 board feet or maybe more. It depends on how much I want to produce. But using a Chainsaw mill is slow work.
@@TomBrueggen how long do these really need to sit for an outdoor project? Same outdoor project, do beams take longer to dry?