Why We Mill Our Own Hardwood Dominoes (and How They Outperform Festool's)

The Domino joiner uses an oscillating router bit to cut a precise oval mortise into a piece of wood. A matching factory-made domino — a beech tenon with an oval cross-section — is then glued into the mortise. The geometry is brilliant: the oval shape resists rotation, the precision of the cut means a tight friction fit, and the speed of the tool is unmatched.

For indoor furniture, casework, and cabinets, the Domino system is excellent. The beech dominoes Festool supplies are kiln-dried, dimensionally stable, and the right size for the joints they're meant to hold. Inside a temperature-controlled house, they last forever.

Outdoor gates are a different problem. The wood is exposed to direct rain, ultraviolet, and humidity swings of 80 percentage points between summer afternoons and winter mornings. In those conditions, beech is one of the worst woods you can put inside a joint.

European beech has a Janka hardness of about 1,300 and beautiful grain, but it has almost no natural decay resistance. The USDA Forest Products Laboratory rates beech as nonresistant to rot. Once moisture penetrates the joint — and it always does, eventually — the beech domino is the first thing to fail.

Beech also moves more than most outdoor-rated woods as humidity changes. The dimensional change is small, but inside a tight joint it's enough to crack the surrounding hardwood as the domino swells, or to open up a gap as the domino shrinks. Over a few seasons in Orinda's microclimate, that translates to visible joint failure.

When a Festool beech domino is used in an outdoor joint, the failure mode is predictable: the domino absorbs moisture, swells, splits the surrounding wood, then dries out, shrinks, and leaves a loose joint. We've torn apart gates built this way and replaced the dominoes with our own.

Every gate we build gets dominoes milled from the same wood as the surrounding stiles and rails. A Sapele gate gets Sapele dominoes. A white oak gate gets quarter-sawn white oak dominoes. An ipe gate gets ipe dominoes. The principle is simple: the joint material should move in sync with the surrounding wood, so seasonal humidity changes affect both at the same rate.

Sapele, white oak, and ipe are all rated by the USDA as resistant or very resistant to decay. They contain natural extractives — tannins in white oak, tropical oils in Sapele and ipe — that resist water absorption and fungal attack. A Sapele domino inside a Sapele gate stile will see decades of weather without breaking down.

We mill our dominoes on a dedicated jig from offcuts of the same boards used for the gate. Nothing is wasted, and every domino has known provenance.

We use the Festool Domino joiner to cut the mortise — just not to supply the tenon. The tool itself is exactly the right way to cut a precise oval mortise quickly and repeatably, and we'd be slower without it.

The substitution is in the consumable. Where Festool ships beech dominoes in plastic bags, we ship our own hardwood dominoes from a labeled bin in the corner of the shop. The mortise cut is the same. The mechanical fit is the same. The joint that comes out the other side is dramatically different.

For our indoor furniture work — including the Sapele dining tables we build alongside gates — we'll often use the factory beech dominoes. Indoors, beech is fine. Outdoors, it's not.

The reason most shops use factory Festool dominoes is that they're dimensionally perfect. Cutting your own tenons that match Festool's mortise dimensions to within a few thousandths of an inch is harder than it sounds, and getting it wrong means the joint is loose.

Our jig produces dominoes in the three Festool sizes we use most — 8mm, 10mm, and 14mm — to within ±0.05mm of the factory dimensions. We measure every batch with calipers. The tongue slides into a Festool mortise with the same friction fit as a factory beech domino.

This dimensional consistency is why we can use our shop-milled dominoes with the Festool tool without compromise — the tool doesn't know the difference, and neither do the joints.

A floating, loose-tenon joint like the Festool Domino system is not always the right choice. For the primary frame of a gate — the corners where the long stiles meet the long rails — we always use a traditional, integrated mortise and tenon (covered in our companion piece on mortise and tenon joinery).

Loose tenons shine for secondary joinery: panel divider rails, mid-rails on tall gates, intermediate stiles, and the joinery inside the cladding of a hybrid steel-and-wood gate. In those locations, the speed and precision of the Domino approach is unmatched, and the load is well within what a 14mm hardwood domino can handle indefinitely.

Knowing which joint to use where is the part of the craft that doesn't fit on a spec sheet. It's the reason we still hand-decide every joint in every gate before any chip falls.

If you're commissioning a gate from anyone in the East Bay, ask what's inside the joints. If the answer is "factory dominoes" without further specification, you're likely getting beech tenons inside whatever expensive hardwood you paid for outside. In a decade, that hidden mismatch will show.

A Heartwood gate uses the same wood inside the joint as outside it — start to finish. The joint is invisible, but it's the part of the gate that determines whether you'll be calling someone for repairs in year eight.

If you'd like to see our dominoes alongside Festool's at the workshop, we welcome shop visits by appointment. Get in touch through our contact page, or read about our custom gate process.

We serve Orinda, Lafayette, Moraga, Walnut Creek, Alamo, Danville, and the entire East Bay corridor from our Concord workshop. Most consultations in Orinda happen within ten days of first contact. See our East Bay service area for project lead times.

A typical custom Sapele entry gate with hand-milled dominoes ranges from $7,500 to $14,500 depending on size and hardware. Automated driveway gates start higher; see our pricing guide for ranges.

Every project starts with a free design consultation. We'll review your site, talk through materials and joinery, and follow up with a fixed-price proposal.