Air drying in cramped spaces, how are you keeping stacks dry without trapping moisture?

[HiddenNia]

I’m dialing in my stacking routine and I keep getting tripped up by the space limitation part. I can’t spread stacks out the way the ideal guides show, so everything ends up closer together than I’d like. Last month I had a stack that looked fine from the outside, but when I pulled a couple middle boards I could smell that damp musty thing starting, and that was my sign I’m not moving enough air.

For those of you drying lumber with limited room, what’s your go to setup that stays mold free. Do you stick to one sticker thickness and spacing no matter what, do you aim for more airflow under the stack, or do you add a small fan and call it a day. Also curious if you have any hard rules on when to cover and how you cover without sealing the whole stack like a humid box.

 

[WalterDirewolf]

That musty smell is the warning sign for me too. My rule is dry base, dry stickers, and a little gap between stacks if I can manage it at all. If it’s really cramped, a small fan aimed down the length of the stack has saved me more than once.

 

[FanLaNorne]

I had that musty middle board thing too. What helped me most was keeping my stickers all the same thickness and actually lining them up straight, then I put the stack up higher off the ground than I thought I needed. Once I did that, the smell stopped showing up.

 

[Alan]

Hard rule I’ve seen work is cover the top only, never wrap the sides. A sheet of metal or plywood with a little overhang and some weight is usually enough. If you tarp, keep it like a roof and leave the sides open so it can breathe. Curious what species you are drying, because some get moldy faster.