Eleanor Hartley
Why Oak, and Why Hand Tools Still Earn Their Keep
Oak is still the right answer for a garden gate. English oak (Quercus robur), air-dried down to around 15–18 per cent moisture content, will shrug off decades of British weather with nothing more than an occasional drink of oil. Softwood gates need replacing in eight or ten years; a well-made oak gate outlives the fence it hangs from. Buy air-dried rather than kiln-dried stock where you can — it works more kindly and moves less once it is outside.
Hand tools suit oak, provided you let them do the work. A sharp, finely set bench plane leaves a surface that sandpaper never quite matches, and a chisel that has been honed properly will pare a shoulder cleanly in a way that a router bit rarely manages. There is also a practical advantage: you can feel when a joint is right. A tenon that taps home with light mallet blows and needs the same to come apart again will still be tight in twenty years. Machine-cut joints are consistent; hand-cut joints are fitted.
The Design, Timber and Tools
This gate is a simple mortice-and-tenon frame with vertical oak boards pegged to the rails. Finished size: 900 mm wide by 1800 mm high. Build it 20 mm narrower than the opening so you have room for hinges and seasonal movement — oak swells in a wet winter, and a gate that fits perfectly in August will jam by November.
Your cutting list, in finished sizes:
- Two stiles, 95 × 45 mm, 1800 mm long
- Top rail, 120 × 45 mm, 810 mm long
- Middle rail, 95 × 45 mm, 810 mm long
- Bottom rail, 120 × 45 mm, 810 mm long
- One diagonal brace, 95 × 45 mm, cut to fit
- Seven infill boards, 95 × 20 mm, cut to length on site
The tool kit is modest: 12 mm and 25 mm bevel-edged chisels, a 300 mm tenon saw, a fine dovetail saw for shoulders, a mortice gauge, a marking knife, an engineer's square, a mallet, a brace with a 10 mm auger bit, a No. 4 or 5 bench plane, and a handful of sash clamps. Add 10 mm oak dowel for pegs, or split your own from an offcut with a froe if you are feeling traditional.
Setting Out: Face Side, Face Edge, Sharp Pencil Aside
Plane one face and one edge of every component flat and square, then mark them as your face side and face edge. Every subsequent measurement comes off those two surfaces, so the whole gate stays true even if the timber is not perfectly regular.
Mark joints with a marking knife, not a pencil. A knife line severs the fibres, so the saw or chisel registers in the cut instead of wandering across it. Set your mortice gauge to the width of the 12 mm chisel — that is your mortice width — and gauge from the face side and face edge every time, so all your setting-out marks finish on the same side of the gate.
Chopping the Mortices
Oak mortices want patience. Set out each one 60 mm deep, centred in the 45 mm thickness, and chop from the face side to halfway through, then turn the stile over and work from the other face. Keeping the chisel bevel towards the waste stops it from levering the sides out of true.
Take light cuts, clear the chips often, and stop about 2 mm short of your knife lines at each end. Once the bulk is out, pare back to the line with the 25 mm chisel, working from both faces to meet in the middle. Test the depth with the tenon itself rather than a rule.
Sawing the Tenons
Saw the cheeks first, cutting on the waste side of the line and checking squareness as you go. Then cut the shoulders, using the fine saw and a good knife line to keep them crisp. Aim for a fit you can push most of the way home by hand but need a mallet to seat fully.
Give the top rail a haunched tenon — a short 12 mm stub above the main tenon — to fill the mortice and stop the rail twisting as the gate dries. The bottom rail tenon can be left plain, but wedge it if you want the joint to be genuinely immovable.
Drawboring, Assembly and Hanging
Drawboring is what makes this gate last. Assemble the frame dry, then bore through the stile 2 mm off-centre towards the shoulder of the joint. Knock the frame apart, chamfer the ends of your oak pegs, and drive them home with glue in the joint. The offset hole pulls the shoulder tight against the stile with real mechanical force — no clamp can match it.
Assemble the frame on a flat surface, check the diagonals are equal, and fit the brace running from the bottom hinge stile up to the latch-side end of the top rail. Peg the boards on afterwards, leaving a 3 mm gap between them for movement.
Finish with two coats of boiled linseed oil thinned with white spirit for the first coat, or a good exterior wood oil. Hang the gate with a 12 mm clearance underneath, top hinge band first, and fit a galvanised or stainless latch. Then leave it alone — the oak will silver off within a season, and thirty years from now it will still be swinging true.
