Dadant Blatt brood body assembled

🌡️ The most demanding part of the hive

The brood box is where the queen lays, where brood develops at a constant 32-35 °C, and where the colony overwinters. Below 30 °C deformities appear; below 20 °C the brood dies. Mechanically, it carries the entire stack above it — 2-3 honey supers can amount to 150-200 kg of static load for the whole flow, plus bees, comb and stores. If the brood box bows out at the sides, everything stacked above loses alignment and the roof seal starts to fail.

🔧 25 mm finger-jointed pine vs the 22 mm standard

The 3 mm extra of wall thickness over the 22 mm standard buy you flexural rigidity and thermal mass. Wood is a decent natural insulator (conductivity ~ 0.12 W/m·K) and 25 mm dampens temperature swings better: in winter the colony spends fewer stores keeping the cluster warm, in summer the wall absorbs the heat peak without transmitting it straight to the interior. Finger-jointed pine means a pine board glued at the ends, more dimensionally stable than a single-piece batten — it minimises warp under humidity cycles. The four corners are interlocked with finger joints: the mechanical fit takes the weight, the nails only close it. Finished with one coat of linseed oil: protects the wood without sealing the pores, lets the box breathe, and can be re-oiled every couple of seasons without stripping anything.

✋ Carved-in handles — not screwed on

The hand grips are cut directly into the side walls, not bolted-on hardware that can work loose over time. A brood box full of bees, brood and stores easily passes 30-40 kg; the day you lift it for an inspection or a floor change, you do not want to discover that an asa screw has been quietly giving way for three seasons. A small detail you appreciate at year five.

🐝 You choose the spacing system — rail+straight or Hoffman

Two equally valid ways of keeping the correct bee space between frames, depending on what you are most comfortable with or what your apiary already runs:

• WITH spacer rail + straight frames (DADB010-CR): the metal spacer rail sitting on top of the frames sets the spacing. Classic system used by professional Dadant beekeepers, easy to reposition and to replace piece by piece.
• WITHOUT rail + Hoffman frames (DADB010-SR): Hoffman frames carry the spacers built into the side bars, so the bee space is set at the factory. More convenient on inspection: lift the frame and the spacers go with it.

If you already have hives running, pick the system you are using — mixing Hoffman with rail+straight in the same brood box gives uneven spacing.

📐 Dadant Blatt compatibility (not Dadant US)

Outer dimensions 500 × 430 mm with 315 mm of height, inner 450 × 380 mm, Dadant Blatt (French standard) format. Stacks under Dadant Blatt fixed-yard supers, crown boards and roofs. Not compatible with Dadant US (top bar 48 cm vs 47 cm on Blatt), nor with Langstroth or Layens. In Spain both Dadant parks coexist; in France and Italy Blatt is dominant. In the UK, Dadant Blatt is mainly used for commercial monofloral production (heather, oilseed rape) — different from the National/Commercial standards. If you come from a Dadant US apiary, the frames will not fit — that one centimetre on the top bar changes everything.

⚠️ Fixed-yard version — for stationary apiaries, not migratory

This brood box has no reinforced perimeter rims and is not built to move on the road. On a fixed yard, the weight of the stack and a stable floor are enough. If you migrate to flows, look for the reinforced (migratory) version and plan a fastening system on top (ratchet straps or fix-elem-type hooks) — without those reinforcements, a fixed brood box can deform or shift under transport load.