Yard trees cost more to mill because many of them have metal inside: nails, fence staples, wire, bolts and old hardware that the tree grew around years ago. One hidden nail can ruin a saw blade in a second, and the mill has to slow down, scan, and cut around suspect spots. That's why most mills charge a fee for each blade damaged by metal, and why a yard tree usually costs more per board foot than a log from the woods.
Metal doesn't mean the tree isn't worth milling. It means the more you can tell us about where the metal is, the less it costs you.
Where metal comes from
A tree adds a new layer of wood every year, right under the bark. Anything attached to the trunk gets swallowed over time. A nail driven in 40 years ago can sit inches inside the trunk with no trace on the outside.
The usual suspects in mid-Missouri yards and farms:
- Fences. Barbed wire and woven wire stapled to fencerow trees, and boundary trees used as fence posts. Fencerow trees are the worst for metal.
- Clotheslines, swings and hammocks. Hooks, eye bolts and chains.
- Signs, mailboxes, lights and birdhouses. Nails and screws, often several at the same height.
- Treehouses and deer stands. Lag bolts, spikes, ladder steps and brackets.
- Old repairs. Cabling and bracing rods put in to hold a split trunk together.
- Survey markers and property pins. Nails and tags on boundary trees.
- Bullets and shot. Common in farm and woods trees near old fields.
- Concrete and stones. Not metal, but just as hard on a blade. Trees that grew next to walls or were filled with concrete at the base can carry it.
Trees from older Columbia neighborhoods, farmsteads, fencerows and old yards carry the most. Trees from the middle of a woods carry the least.
What metal does at the mill
It wrecks blades. A saw blade hitting a nail can lose its teeth or edge instantly. Hitting a staple or wire can do the same. A damaged blade has to be resharpened, re-set or thrown away, and the mill stops while it's changed.
It stains the wood. Iron reacts with the tannins in oak, walnut, cherry and other woods, leaving blue-black or gray streaks around the metal. The stain can run along the grain well past the nail itself. Some people like the look in rustic work. Most don't want it in a tabletop.
It costs yield. When we find or suspect metal, we cut around it. The board with the nail in it gets trimmed or downgraded.
It's a safety issue. Metal can throw sparks or fragments at the saw. Careful milling means slowing down, scanning and sometimes skipping a section entirely.
The blade fee
Most custom sawmills charge a set fee for each blade damaged by metal in a customer's log. It covers the cost of the blade and the time to change it. Nationally that fee runs about $25 to $50 per blade (national range, not our price), and it's standard for yard trees.
The fee isn't a penalty. It's how a mill can take yard trees at all. Without it, mills would refuse any log with a chance of metal, and a lot of good yard walnut and oak would go to the firewood pile.
How mills look for metal
Before sawing, a careful mill checks the outside of a log for signs of hidden metal, and many scan it with a metal detector. Signs to look for on the bark include:
- Scars, bumps and bulges where the tree grew over something.
- Dark streaks or stain running down the bark below a spot.
- Rows of small holes or rust marks at the same height.
- A visible end of a nail, wire or staple.
Detectors find most metal near the surface. They can miss metal deep in a large trunk, and they can't find stones or concrete. So even a careful scan doesn't guarantee a clean log.
What you can do before you haul
You know your tree better than anyone. A few minutes of checking can save you a blade fee or two.
- Think about the tree's history. Was there ever a fence, clothesline, swing, sign, treehouse or deer stand on it? At what height?
- Walk around the trunk. Look for the signs above, especially at about head height and fence height.
- Run a magnet or a cheap metal detector over the bark if you have one. Hardware stores and online sellers carry handheld detectors.
- Mark anything suspicious with bright paint or crayon. Don't drive a nail or screw to mark it.
- Tell us when you send photos. "There was a fence on the south side about 4 feet up" is exactly the kind of note that saves money.
If you know there's metal in one section, consider cutting that section off and leaving it for firewood. A slightly shorter, clean log is often worth more than a longer one with a nail in the middle.
If a tree service is cutting the tree
Ask the crew to watch for metal and tell you. A chainsaw that sparks or a chain that suddenly dulls means they hit something. Have them mark the spot. See what to tell the tree crew for the rest of the list.
Is a tree with metal still worth milling?
Often, yes. A big yard walnut or white oak can be well worth a blade fee or two, especially if it has family history. What matters is going in with realistic expectations:
- Budget for at least one blade fee on any yard tree that had something attached to it.
- Expect some stain or lost boards around the metal.
- Keep the sections near fences and hardware short, and the clean sections long.
For the rest of the decision, read is my tree worth milling? and see custom sawmilling for how a job runs.
Get a Quote
Send us photos of the log, both ends, any bulges or scars on the bark, and anything you know about what was ever attached to the tree. We'll tell you up front how we'd handle it and what it may cost.