What a Free Backyard Oak Really Costs to Mill Into Lumber

Let me do this math in public. What does a "free" backyard oak actually cost to turn into boards? Not the fairy tale. The line items, the yield you lose, the months you wait, and the moment you realize the mill is charging you three dollars and change a board foot for the same thing with none of the work.

First, One Out of Two Logs Is a Nail Bomb

Here's the number that should sit on top of every urban wood fantasy. Seth Carlson, who runs Dakota Timber Company, told Family Handyman that one out of two urban salvaged logs has metal in it. Treehouses, birdhouses, nailed-on signs. He calls the resulting blade cost "quite insane."

What Carlson's figure does is tell you how to plan: on an urban log, assume sparks. That means sharpening money in the budget before you ever make the first cut.

Forester Shop prices mail-order sharpening by chain type: ripping chain runs $11.00 to $16.00 per chain, and that listing is written explicitly around Alaskan saw mill users who hit a nail. You can't price how many times you'll sharpen, because no source will tell you and I won't make one up. But you can see the shape of the risk: every metal hit is a sharpening bill.

That ripping chain itself is a line item too. A Stihl ripping chain loop, 72 drive links, 3/8 pitch, .050 gauge, part 3691-005-0072, is $31.19 at Kappa Outdoors, regularly $38.99. You want more than one loop. Popular Woodworking's milling piece is blunt about it: a standard chain "will cut. But it will be painful." Buy a handful of loops.

The Mill Itself Has a Price Tag and a Power Requirement

The hardware: a Granberg 36-inch Alaskan MKIV, model G778-36, lists at $330.00 at Wasatch Timber. It handles up to a 42-inch cutting width, mills planks up to 32 inches wide, and weighs 18.1 pounds. And it comes with a condition — the saw has to be 70cc minimum.

Popular Woodworking confirms that 70cc floor and adds a fact most people don't want to hear: most saw manufacturers don't recommend milling with their saws at all. The saw they put behind the test mill was a Stihl MS880, Stihl's biggest. So the math isn't just $330 for the attachment. It's $330 plus a powerhead that can actually push it.

Now the fuel. Same Popular Woodworking test, a log about 44 inches in diameter, a pin oak. One full cut through the log burned almost an entire tank of gas in that MS880. Not a fantasy fuel number — a tank per cut. On a big log that's a lot of tanks before you have anything to stack. Nobody has published a fuel cost per board foot, so I'm not going to invent one. But if you've run a big saw, you already did that arithmetic in your head, and it didn't feel good.

Where the Wood Goes: Kerf and Yield

Here's the part nobody warns you about, and it's the reason your "free" log produces fewer boards than you think. A chainsaw mill wastes nearly a quarter inch to three-eighths of an inch of wood per pass as sawdust. A bandsaw mill wastes one-sixteenth to one-eighth. Best Professional Chainsaw has the comparison, and it's sobering. If you're slab-cutting with a chain, you are literally buying kerf.

Then the log itself. The Doyle scale, the one on the stick, runs bd ft = [(D−4)/4]² × L. That's small-end diameter in inches, length in feet, with a 4-inch slab allowance and a 5/16-inch kerf. That means the number on the scale already bakes in waste you never see as a board. And if you want to measure honestly, even the stick costs something — Conway Cleveland lists a folding Lufkin Doyle rule at $31.95, a physical scale stick at $45.50. Small money, but it's real money.

Then Popular Woodworking's field practice, which I'll steal every time: cut at 2-1/2 inches thick to finish a 2-inch tabletop after drying and surfacing. Which is the other thing they don't tell you — the log owes you more than one tax. Milwaukie Hardwoods says to allow 10% for drying-related shrinkage, plus a quarter inch per 8 inches of board width for surfacing both sides. Boards wider than 8 inches can need three-sixteenths to a quarter inch per side. Advantage Lumber puts surfacing loss at 10–15% of material. So a 2-inch board in the rough is not a 2-inch board on the bench. Ever.

Stickers Are Cheap. Stickers Are Not the Problem.

This is where I have to be honest about the cheapest line item, because it's the one that makes people feel clever and it shouldn't. Stickers cost almost nothing. Gene Wengert, writing on Woodweb, frames it cleanly: against dried lumber worth about $2 a board foot, sticker cost is under $20 per MBF. A few stained boards cost more than the stickers.

Milwaukie Hardwoods specs the standard: dry hardwood, 3/4 inch thick by 1-1/4 inch wide, and 1 inch thick for air-drying. Or buy cheap furring strips and cut a 1x2 in half for 48-inch stickers. A Woodweb contributor says 10-foot 2x4s will yield 18 stickers at 3/4 by 1 by 40 inches. Stickers must be dry — green stickers cause sticker stain.

Spacing: 18 to 24 inches suits almost any lumber, per Oregon State University Extension. Elm needs stickers every 12 inches. Keep the stack off open ground. Don't tarp the sides on a green stack except briefly in rain, or you may grow surface mold.

So the stickers are not the sticker shock. The log and the waiting are.

There Is No One Year per Inch (Except When There Is)

Here's the thing the "one year per inch" rule wants you to believe, and here's what the sources actually say.

Oregon State University Extension: air-drying takes from several months to almost a year depending on conditions, species and size. Also: 2-inch lumber can take three to four times as long to air-dry to a given moisture content as 1-inch lumber of the same species. Read that again.

The Wood Database calls the one-year-per-inch rule "at least a rough starting point," and only that. Milwaukie Hardwoods is blunter: the rule is "inaccurate except for certain slow drying species such as oak." Their species days: 1-inch walnut air-dries to around 120 days in the South in summer, poplar about 90, pine in the South in summer about 60-90. Oak, mesquite and hickory are the slow group — about an inch per year.

You own a backyard oak. You picked the slowest species on the list. A 2-inch-thick slab stack has three-to-four-times-the-1-inch drying time in front of it, and the "year per inch" rule, which is wrong for pine and walnut, is right on the money for you. That is the definition of a mixed blessing.

Two more numbers worth knowing before you commit the second bedroom to this. Lumber for interior use wants 6%–10% moisture content with 6%–8% ideal. Air-drying stalls at an equilibrium moisture content of 12%–16% in a space that isn't climate-controlled. So the air-dry stack is a first stage, not the finish line — you're going to need a kiln decision at the end, or a wide tolerance for wood that moves.

And oak specifically dries badly. Advantage Lumber's sheet on red oak says it has a "tendency to dry slowly with checking, splitting and honeycombing." The Wood Database lists red oak shrinkage green to oven dry at 4.0% radial, 8.6% tangential, 13.7% volumetric, and calls the stability mediocre, especially in flat-sawn boards. Add the weight — 43.8 lb/ft³ at The Wood Database, about 48 at Advantage Lumber — and you're not just waiting, you're handling a lot of mass to get there.

The Benchmark That Kills the Myth

So what does it cost, all in? I'm not going to pretend I have a documented case study, because nobody does — no source tracked a real backyard oak end to end with itemized receipts. What I can do is lay the component prices against what mill-dry red oak sells for and let the arithmetic argue.

Advantage Lumber lists rough 4/4 red oak at $3.60 per board foot, with a 10% upcharge for lengths over 7 feet. North Castle Hardwoods prices rift and quarter-sawn red oak thin stock at $4.48 to $6.35 depending on thickness, kiln-dried to 6.0%–8.0%. And if you're buying urban wood already milled out of somebody else's yard, Family Handyman reports it's typically graded #2 with knots and defects, but priced like Select or FAS — $3 to $5 a board foot.

That's the number to beat. Multiply $3.60 by every board foot your oak might have held before kerf, shrinkage, surfacing and the pith. Then ask whether your time, your saw, your $330 mill, your $31 ripping loops, your sharpening bills and the drying calendar come in under that.

Sometimes they do — an elm, something non-commodity, an emotional need to keep a tree on the block, all fair reasons to mill it yourself. But "free lumber" is the wrong framing for the deal. The log is free. The boards are not.

What I Actually Do Now

If it's my call, I'd say this: mill the log when the wood is special to you or unavailable from a dealer, not to save money on a species you can buy kiln-dried and graded. If it is worth milling, seal the ends in the yard, cut thick to allow for surfacing, budget for a second ripping loop, and build a stack foundation you'd trust with your own body weight. Then accept that oak is the slow lane. The chair you're building wants 6%–8% wood, and the tree still thinks it's a tree.