How Wood Actually Gets Ready for a Project
There's a lot of wood for sale in the Chicago suburbs. Big-box racks, online marketplaces, guys with a Bandsaw mill and a Facebook page. Most of it is sold as "kiln dried." Most of it isn't, in the sense that matters.
This post is about what kiln dried actually means, why the difference shows up six months after you build the table, and how a log gets from someone's front yard in Glen Ellyn to project-ready stock on our racks.
What "kiln dried" is supposed to mean
Wood holds water. A freshly cut log can be 60% water by weight. Build with that, and the wood will keep drying after it's in your house — shrinking, twisting, splitting at the joints, pulling screws out of finished pieces. Heated indoor air pulls moisture out fast in winter. That's where the warped shelves and cracked tabletops come from.
The fix is to get the moisture content down before the wood leaves the shop. Furniture-grade target is 6–8% MC. You measure it with a pin meter in three spots on the board, not by feel and not by how long it sat in someone's barn.
Three questions worth asking about any wood you didn't dry yourself:
Where did you buy it?
Was it kiln dried?
How was it kiln dried?
Anyone who won't let you put a meter in the wood is telling you something about the wood.
Kiln dried in a garage is not kiln dried
A box with a heater in it is not a kiln. A shipping container with a dehumidifier is not a kiln. Wood that "sat in the kiln area" is not kiln dried. These distinctions matter because the wrong drying method leaves moisture trapped in the core of the board even when the surface reads dry on a meter.
Just because it went in a box doesn't mean it was kiln dried.
A real kiln has controlled temperature, controlled humidity, controlled airflow, and a defined schedule that matches the species and thickness. It also has a way to verify what came out actually got dry — not just the outside, all the way through.
What we run
Raw Heartwood runs an iDRY Plus vacuum kiln. Capacity is 4,000 board feet. Max stock is 16 feet 4 inches long, 60 inches wide, 65 inches tall.
Here's the relevant part. Wood goes in at 20% MC or under — meaning it's already been air-dried on stickers in the yard for months before it sees the kiln. It comes out at 6–8% MC. The drying rate is 7 to 9 days per inch of thickness. A 2-inch slab is in the kiln for about two and a half weeks, after a year of air-drying first.
Conventional steam kilns take roughly six weeks for the same job. Vacuum kilns are faster because water boils at a lower temperature under reduced pressure. Same reason coffee is worse in Denver.
The other thing the vacuum kiln does is sterilize. Powder post beetles, larvae, fungal spores — none of it survives the cycle. That matters for urban salvage wood, which has been outside for the entire life of the tree.
The log is its own problem
Most of our hardwood comes from trees that had to come down somewhere in DuPage County — storm damage, construction, a homeowner who's had enough. The alternative for those logs is mulch, sometimes firewood. Some of them are gorgeous on the inside. Some of them have a fence post grown into them at chest height.
A log shows what it is when the first cut opens it up. Sometimes it's a dining table. Sometimes it's firewood. That's the job.
The best metal detector on a log is a new blade. Golf balls, fence wire, hammers, the occasional bullet — urban trees collect things over eighty years, and some of those things end up six inches inside the trunk. We inspect logs before they go on the mill, and we still hit metal often enough that the mill minimum ($300) covers a blade if a log eats one.
Character is real. So is the metal. Anybody selling you "urban wood" without mentioning the second part is telling you half the story.
What project-ready means
Slabs and boards leave the shop at 6–8% MC, measured on a pin meter in three spots. The faces are flattened on the CNC if you want them flat (4 ft × 4 ft work area, $100/hr, detail to 1/32 inch). The edges are still live unless you ask otherwise.
What you pick up is what goes on the base. No further drying needed, no extra acclimation period, no surprises six months in.
That's the standard. It's also the answer to why a board foot here costs more than a board foot at a place that skipped the year of air-drying and the two weeks in the kiln. You're paying for the time the wood spent being made stable. If it was easy, everyone would do it.
If you're bringing your own wood
Custom drying runs $1.80–$3.50 per board foot, depending on species and thickness. Minimums are 250 board feet and one week. The wood needs to be at 20% MC or under when it arrives, which usually means it's been stickered outside for a season or two.
If you don't know what your moisture content is, bring the wood in. We'll meter it for free and tell you whether it's ready to load or needs more time on stickers. Sometimes it's fast, sometimes it's slow.
Bring a log, leave with lumber. Or bring lumber and leave with a table. The shop does A to Z — milling, drying, CNC, custom builds — and you never know what's walking in the door, which is most of why the work is interesting.