5 Bar Stools Upgraded from Frosta Legs and a Skogsta Butcher Block Top

Cutting five compact seat blanks from one Skogsta worktop

The Skogsta acacia worktop measures 74 cm by 39 cm, so the seat layout has to respect the narrow side of the slab. A pair of 28 cm rows will not fit across 39 cm. A workable plan is to cut five compact rectangular blanks from a two-row layout, about 24 cm by 19 cm each, using a normal circular-saw kerf of roughly 2 to 3 mm between cuts. That layout leaves one spare rectangle or trimming stock if the full six positions are marked, and it keeps every finished seat within the actual footprint of the worktop.

Mark three divisions along the 74 cm length and two divisions along the 39 cm width. Keep the kerf on the waste side of the line, because losing even a few millimetres across repeated cuts shows up quickly on a slab this small. The finished blanks are narrower than the original Frosta seat, so they suit compact kitchen seating better than long sitting sessions.

Acacia is a dense hardwood around 700 kg per cubic metre. A 40-tooth crosscut blade gives cleaner exit edges than the general-purpose 24-tooth blade many saws carry by default, especially where the blade exits the underside of the worktop.

Clamp a straightedge guide 4 cm from the blade base plate if that is the offset your saw needs, and check it on a scrap line before cutting into the slab. The finger-jointed construction of the Skogsta top means glue lines run across the width. Cutting across those joints with a dull blade can chip the surface veneer.

Score each cut line first with a utility knife along the straightedge. The score severs the top fibres before the saw teeth reach them, which reduces splintering along the visible face.

Round the blank corners to a 20 mm radius with a jigsaw, then sand the edges with 120-grit paper. That small radius removes the sharp arris that would otherwise press into the back of a thigh.

Mounting Frosta legs without loosening the seat

Frosta legs attach to their original stool seat through pre-drilled angled holes that set a fixed splay of about 8 degrees from vertical. Screwing the bent birch legs straight into a 27 mm acacia blank can hold at first, yet the load gathers around one screw point and repeated sitting can loosen the joint within weeks.

A mounting plate spreads that load. Use either 4 mm steel or 12 mm plywood, cut to a 90 mm square for each leg position. The plate gives four screw positions around the leg bolt and keeps the splay angle consistent across the set.

Cut plywood plates with the same saw setup used for the seats. Drill a central clearance hole for the Frosta leg bolt, then drill four 4 mm pilot holes at the corners for the screws that fix the plate to the underside of the seat. Countersink the holes so the screw heads sit flush and do not foul the leg bracket.

Set each plate 35 mm in from the seat edge. Closer placement pushes the outermost leg tip beyond the seat footprint, which makes the stool easier to tip when someone leans back. On the compact rectangular blanks, the plate position matters more because there is less margin around the leg splay.

Dry-fit before glue. Install two screws per plate, sit on the stool, and check for wobble on a level surface. A single uneven leg can be shimmed with a folded strip of 0.5 mm veneer tape. Once all four legs sit flat, drive the remaining screws and run a bead of polyurethane construction adhesive between the plate and the seat.

Danish oil on the acacia seats

Danish oil darkens acacia grain by roughly two shades and leaves a matte, wipe-clean surface that handles kitchen use better than the raw factory finish. Sand each seat blank to 180-grit, wipe with a tack cloth, and flood the first coat with a lint-free rag until the wood stops absorbing.

Acacia has open pores, and the first coat disappears quickly into fresh cuts. A 74 cm worktop cut into stool blanks can take about 200 to 250 ml across two coats, depending on how thirsty the end grain is.

Wipe off all surplus oil after 15 minutes. Pooled oil cures to a sticky film that never fully hardens, and on a seat that flaw transfers to clothing. Let the first coat sit for 24 hours, scuff with 320-grit paper, then apply a thinner second coat and buff the surface dry.

Give the edges and end grain extra attention. Cut acacia end grain wicks moisture, and a stool base exposed to a mopped-floor puddle can swell if the end grain remains raw.

Sugru for a split Frosta leg

Bent birch Frosta legs can crack along the lamination when overloaded, usually at the tightest curve near the foot. A single split leg does not scrap the stool.

Pack the crack with Sugru mouldable adhesive, clamp the lamination closed for the 24-hour cure, and leave the leg undisturbed. The repair can outlast the original glue line because Sugru stays slightly flexible under the loads that broke the rigid factory bond.

Levelling the stools to the counter

Counter-height seating depends on a narrow height range. A 90 cm kitchen counter wants a seat height around 65 cm, leaving about 25 cm of clearance for knees. Frosta legs come at a fixed length, so a short result calls for a taller mounting arrangement, while a tall result means trimming every set the same way.

Measure each assembled stool from the floor to the top of the seat and write down all five figures. A variation of more than 5 mm becomes obvious when the stools stand in a row at the same counter, because the eye follows the seat line.

For trimming, invert one stool on a flat bench and mark the cut line with a combination square referenced from the bench surface. Cut all four legs on that stool before moving to the next one. Cutting one leg at a time across several stools invites drift from setup changes and pencil-line errors.

A cheap correction for a stool that ends up 8 to 10 mm low is a set of adhesive rubber feet. Hardware counters commonly sell them in 20 mm and 25 mm profiles. Stacking profiles raises the stool and protects the floor at the same time.

Rubber feet also mute the birch-on-tile clatter that bare Frosta leg ends make when a stool is dragged across a kitchen floor. A stool that lands too tall has no shim fix; the leg has to come off for a recut, which is why the height check belongs before any finish is applied to the leg ends.

Screw length and load at the plate

The screw choice matters on a seat carrying an 80 to 100 kg adult with extra load each time someone sits down hard. With a 12 mm plywood plate, a 4x30 mm wood screw gives about 18 mm of bite into the 27 mm acacia seat, leaving wood above the screw tip. With a 4 mm steel plate, a shorter 4x20 mm or 4x25 mm screw is the safer match, since a 30 mm screw can come too close to the sitting surface after countersinking.

Four screws at the corners of a 90 mm plate resist the rotational force that a single central bolt cannot control. A single 4 mm steel screw in hardwood carries well over 100 kg in shear along its shank, so the four-corner pattern is about resisting cyclic loosening as much as carrying static weight. Each sit-down applies a small prying force at the plate edge, and the wider screw pattern holds the plate flat.

Drive each screw until the head just seats, then add a quarter turn. Over-driving strips the pilot hole in acacia and leaves a spinning screw with little grip.

Cross-check the five stools against the counter before oil touches the leg ends. An unfinished cut end dragged across a wet floor can swell within a season, and the first sign is a stool that rocks on a floor that was level. The freshly cut leg bottoms are the last raw wood left after trimming. Two coats of the same Danish oil on those cut faces finish the set without leaving the birch end grain exposed.