Top-Bar Hive

Part of Beekeeping

The top-bar hive is the simplest, lowest-cost beehive design that still allows effective colony management. Unlike frame hives requiring precision carpentry and wax foundation, a top-bar hive can be built from rough-sawn lumber, salvaged wood, or even hollow logs with added bars.

Why Top-Bar Hives

Top-bar hives originated in Africa and have been used successfully for centuries. They require no frames, no foundation, no extractor, and minimal woodworking skills. The bees build natural comb hanging from removable bars, which the beekeeper can inspect, rearrange, or harvest individually.

Feature	Top-Bar Hive	Langstroth (Frame) Hive
Cost to build	Very low ($10-30 in materials)	Moderate ($50-150)
Tools needed	Saw, hammer, nails	Table saw, router, or precision hand tools
Foundation required	No	Yes (wax or plastic)
Extractor needed	No (crush-and-strain)	Yes (centrifugal)
Stackable	No	Yes
Honey yield	Lower (60-80% of Langstroth)	Higher
Inspection ease	Excellent (one bar at a time)	Good (full frame)
Weight to lift	Individual bars (~2 kg each)	Full supers (15-25 kg)
Natural comb	Yes	Optional

The Best Hive Is the One You Can Build

In a rebuilding scenario, the top-bar hive’s simplicity is its greatest advantage. You need only straight lumber, something to cut it with, and nails or pegs. A Langstroth requires precise bee space (8 mm gaps), standardized frame dimensions, and wax foundation — all harder to achieve without industrial supply chains.

Design Specifications

Overall Dimensions

The standard Kenya Top-Bar Hive (KTBH) has trapezoidal cross-section — wider at the top, narrower at the bottom. This shape mimics the natural comb profile and discourages bees from attaching comb to the sides.

Dimension	Measurement	Notes
Length	90-120 cm (36-48 in)	28-32 bars capacity
Top width (inside)	38-43 cm (15-17 in)	Must match bar length
Bottom width (inside)	15-20 cm (6-8 in)	Narrower than top
Depth (inside)	25-30 cm (10-12 in)	Deep enough for full comb
Side wall angle	120° from horizontal	Creates ~30° inward slope
Bar width	3.2-3.5 cm (1-1/4 to 1-3/8 in)	Critical dimension
Bar length	43-48 cm (17-19 in)	Spans top opening + 2.5 cm overhang each side
Bar thickness	1.9-2.5 cm (3/4 to 1 in)	Must support comb weight

Bar Width Is Critical

Worker comb has a natural spacing of 3.2-3.5 cm (1-1/4 to 1-3/8 in) center-to-center. If bars are too wide, bees build drone comb (which you don’t want in excess). If too narrow, bees build cross-comb spanning multiple bars, making inspection impossible. Measure and cut bars precisely — this is the ONE dimension that must be accurate.

Side Wall Angle

The 120-degree angle (measured from horizontal, or equivalently 60 degrees from vertical) is important. At this angle:

• Bees build comb that hangs free from the walls
• Comb naturally tapers to match the narrowing body
• Walls are self-draining (rain runs off if the hive is slightly tilted)

If you make the sides vertical (like a box), bees will attach comb to the walls, and you will tear it every time you try to inspect. If you make the angle too steep, you waste interior volume.

Comb Guides

Each top bar needs a comb guide on its underside — a ridge or strip that tells the bees where to start building comb. Without guides, bees build wherever they want, often crossing multiple bars.

Options for comb guides (from best to simplest):

1. Wax strip: Melt beeswax and pour a thin line along the center of each bar’s underside. The bees follow this immediately.
2. Wooden ridge: Glue or nail a thin wooden strip (6 mm wide, 6 mm tall) along the center. Bees usually follow it.
3. Saw kerf: Cut a shallow groove along the bar’s center. Press melted wax into it.
4. Triangular bar: Cut the bar with a triangular cross-section (pointed edge down). The bees treat the ridge as a natural starting point.

Triangular Bars Are Most Reliable

If you have a table saw or can rip boards at an angle, triangular-profile bars are the most foolproof comb guide. Rip a 3.5 cm wide board at 45 degrees on both long edges, creating a wedge shape. Bees follow this shape 95%+ of the time with no wax needed.

Construction Step by Step

Materials List

For one hive (90 cm length, 28 bars):

Component	Material	Quantity
Side panels	2.5 cm (1 in) lumber, 30 cm wide	2 pieces, ~95 cm long
End panels	2.5 cm lumber	2 pieces, cut to trapezoidal profile
Top bars	2.5 cm lumber, 3.2-3.5 cm wide	28-30 pieces, 48 cm long
Bottom board (optional)	Plywood or boards	1 piece, 15 x 90 cm
Legs	4x4 or sturdy poles	4 pieces, 60-75 cm long
Follower boards	Plywood or boards	2 pieces, cut to match interior cross-section
Nails or screws	Galvanized	~100 pieces
Roof material	Tin, thatch, or boards	To cover top

Step 1: Cut End Panels

The end panels define the trapezoidal cross-section. Draw the shape on your board:

1. Mark a horizontal line 40 cm wide (the top)
2. Center a parallel line 17 cm wide below it, 28 cm down (the bottom)
3. Connect the ends — this gives your ~120° side angle
4. Cut along the lines

Make two identical end panels. These are the most critical pieces for maintaining correct geometry.

Step 2: Cut and Attach Side Panels

Cut two side boards 95 cm long and 30 cm wide. These need to angle inward. You can:

• Bevel the top edge so it sits flush against the end panels (cleaner but requires a plane or angled saw)
• Simply nail them on at the correct angle — the end panels will set the angle

Attach side panels to end panels with nails or screws. Pre-drill if using hardwood to prevent splitting.

Step 3: Optional Bottom Board

A narrow bottom board closes the bottom of the trapezoid. In warm climates, you can leave the bottom partially open (screened) for ventilation and varroa mite drop. In cold climates, close it.

If using a bottom board, cut it to match the narrow bottom width (15-17 cm) and nail it between the bottom edges of the side panels.

Step 4: Cut Top Bars

This is where precision matters. Cut 28-30 bars, each:

• Width: 3.2-3.5 cm (measure carefully — use a consistent guide)
• Length: 48 cm (spans the top opening plus 2.5 cm overhang on each side)
• Thickness: 2-2.5 cm

Sand or plane the underside smooth. Add your chosen comb guide to each bar.

Batch Cutting Bars

Set up a stop block on your saw so every bar is exactly the same width. Even 2 mm variation compounds across 28 bars and creates gaps bees fill with burr comb or propolis, making bars stick together.

Step 5: Entrance Holes

Drill 2-3 entrance holes (2 cm / 3/4 in diameter) near one end of the hive, about 5 cm from the bottom. Position them on the same end panel or the side panel near one end.

Alternatively, leave a 1 cm gap at the bottom of one end panel. Either approach works — the bees will figure it out.

Place the entrance at one end (not the middle) because the colony will organize itself with brood near the entrance and honey storage at the far end.

Step 6: Follower Boards

Cut two boards to match the interior cross-section exactly. These slide inside the hive and press against the last bar of comb on each side, creating an adjustable cavity size.

Follower boards serve critical functions:

• Confine the colony to appropriate space (expand as they grow)
• Insulate unused space
• Prevent bees from building wild comb in empty areas
• Create a safe zone behind the follower for inspecting without disturbing the whole colony

Step 7: Legs and Stand

Mount the hive on legs 60-75 cm (24-30 in) tall. This:

• Puts the hive at comfortable working height
• Discourages ground predators (skunks, toads)
• Keeps the hive dry above wet ground

Angle the legs slightly outward for stability. You can also rest the hive on a simple table or sawhorses.

Step 8: Roof

The roof protects bars and bees from rain and sun. Options:

• Corrugated tin — best rain protection, reflects heat with light-colored paint
• Wooden boards with an overhang — simple, available
• Thatch — good insulation in hot climates

The roof must be removable (not nailed down) to access bars. Weight it with a rock or strap it with wire in windy areas.

Setting Up and Managing

Initial Colony Installation

When installing a swarm or package of bees:

1. Remove all but 8-10 bars from one end
2. Place follower boards to confine the space to those 8-10 bars
3. Shake or pour bees into the cavity
4. Replace bars gently
5. Close the hive and leave undisturbed for 5-7 days
6. After one week, check that bees are building straight comb on the bars

Expansion

As the colony grows, move the follower board back and add more bars. Always add bars between the last brood comb and the follower — never at the far end away from the brood nest. Bees expand outward from their brood nest.

A good rule: when 70-80% of the available bars have comb, add 3-4 more bars by moving the follower.

Inspection Technique

Top-bar hive inspection is gentle and methodical:

1. Smoke the entrance lightly
2. Remove the bars from the honey end (farthest from entrance) first
3. Lift each bar straight up — never tilt or rotate, as natural comb is fragile
4. Inspect quickly and return
5. Work toward the brood nest
6. Never leave bars out in the sun — comb softens and can collapse at 35°C+

Heat and Comb Collapse

Natural comb is held together only by beeswax, which softens around 35°C and melts at 62-64°C. On hot days, inspect early morning or evening. Never leave full comb bars exposed to direct sunlight. Handle comb-heavy bars vertically — if you tip them horizontal, the comb can tear off and fall. This is the main disadvantage of top-bar hives versus frame hives.

Colony Organization

In a well-managed top-bar hive, the colony self-organizes from entrance to back:

1. Entrance end: Empty guard comb, pollen stores
2. Middle section: Brood nest (eggs, larvae, capped brood)
3. Between brood and honey: Pollen and transition comb
4. Far end: Honey stores

This organization tells you where to harvest (far end) and where to never disturb unnecessarily (middle brood section).

Common Problems and Solutions

Problem	Cause	Solution
Cross-comb	No comb guides, or bars too wide	Add wax guides, correct bar width
Comb attached to walls	Sides too vertical	Rebuild with proper 120° angle
Comb collapse	Heat, rough handling	Inspect in cool hours, lift bars vertically
Colony too small	Cavity too large	Move follower boards in to compress space
Robbing	Entrance too large	Reduce entrance to 1-2 holes, use cork or grass
Condensation	Poor ventilation	Add small vent holes near top at far end

Variations and Adaptations

Log Hive Adaptation

If you have a large hollow log (30+ cm internal diameter), you can convert it to a top-bar hive:

1. Split the log lengthwise (or cut a flat top section off)
2. Flatten the top edges
3. Lay bars across the top
4. Add end caps
5. Mount horizontally on supports

Barrel Hive

A wooden barrel cut in half lengthwise, mounted horizontally, with bars laid across the open top. Line the interior with a thin layer of beeswax to attract a swarm.

Mud and Wattle Hive

In areas without lumber, build the hive body from wattle (woven sticks) plastered with mud/clay. The interior dimensions must still match the specifications above, and the bars must be straight, smooth wood.

Key Takeaways

A top-bar hive is the most accessible beehive design for post-collapse conditions. The critical dimension is bar width: 3.2-3.5 cm (1-1/4 to 1-3/8 in) for worker comb. Build with trapezoidal cross-section (120-degree side angle) to prevent comb attachment to walls. Add comb guides (wax strip, wooden ridge, or triangular profile) to every bar. Use follower boards to manage cavity size as the colony grows. Handle comb-heavy bars vertically — natural comb is fragile and collapses in heat. Inspect from the honey end toward the brood nest, and harvest only from the far end away from the entrance. Total cost in materials: under $30 with new lumber, or effectively free with salvaged wood.