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The lumber stack for my model can be 13' L x 48" W x 55" T. So if you loaded had 1 1/8" lumber and 3/4 stickers you could get 29 rows of lumber at 52 bdft a row in a perfect world, that comes to 1508 bdft. My average 4/4 load is more like 1200 bdft. The lower bdft is from not every board being 13' long, having some live edge pieces where you can't put boards perfectly side by side, and I prefer to load with a forklift on pallets to cut down on labor (similar to your pic above actually). The pallets cost a couple of rows of lumber unfortunately. My current forklift can not lift a full of green for the kiln so I have to use two pallets unfortunately.The bdft per load increases with thicker lumber since the lumber to sticker ratio is better.

That's exactly what I found by calculation. If I assumed 12ft long 42" 8/4 slabs and 3/4 stickers, I get 840 BF. If I assume 8' plus 4' long 5/4 boards with 3/4 stickers, I get 1440 BF(perfectly packed 48" wide layers). You have to figure realistic numbers into your payback calculation.

Theoretically, but logs you slab are not necessarily consistent. You Can't get 48" wide slabs consistently. Say your slabbing a 38" log. Your top and bottom slabs may only be 24" or less? while your center slabs will be 38. I was very optimistic/liberal by assuming that all slabs were 42". I've only had 2 logs that were 48 at the widest point(where the crotch starts to flare). 36" is not unusual. So you won't be making a solid stack with live edge. If you have 8/4 boards to fill some of it in, great, but it still won't be tightly packed due to live edges.

@Brad_bb For 12'L x 42"W x 8/4 with 3/4 stickers I get 1680 BF, one of us is off by a factor of 2. A perfect 12/4 load comes to 2184 BF, if my math is right.

So far I’ve been pleased with the iDRY. I mostly dry my own lumber and slabs to sell. It seems like I’m getting better results when i start the kiln off at 130 degrees for several days rather than 160. Mainly less checking. Trying to maximize space in the kiln can be a real challenge with slabs.

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