Honey bees naturally build honeycomb both inside managed hives and in the wild. Under normal conditions, comb is constructed in straight, vertical sheets that maintain a consistent width. Occasionally, however, bees build comb that extends sideways and connects two or more frames instead of remaining within a single frame. This type of irregular comb is known as bridge comb. Beekeepers may also encounter comb built in other unintended locations within the hive. Along with brace comb and cross comb, bridge comb falls under the general category of burr comb, which refers to comb built where it is not desired.
What is the Problem with Bridge Comb?
Bridge comb can make hive inspections difficult because it connects adjacent frames, causing the comb to tear when the frames are separated. Since bees invest significant amounts of nectar, wax, time, and energy into constructing comb, damaging it is both disruptive and wasteful. For this reason, beekeepers should do their best to prevent bridge comb from developing, regardless of whether they practice conservation-focused or commercial beekeeping.
Removing bridge comb also delays colony progress. The bees must replace the discarded wax before they can focus on storing nectar or raising brood, costing them valuable time during the productive season. In honey-producing operations, extensive bridge comb can ultimately reduce the annual honey harvest because the colony must redirect resources toward rebuilding damaged comb instead of filling properly placed comb with honey.
Understanding Bee Space
Modern beekeeping relies on the principle of bee space, a concept discovered by Rev. L. L. Langstroth. He observed that honey bees generally leave gaps measuring between ¼ inch (6 mm) and ⅜ inch (9.5 mm) open as passageways. Spaces smaller than this are typically filled with propolis, while larger gaps often encourage bees to construct additional comb. Although bees in the wild are not restricted by bee space, maintaining these measurements in managed hives helps ensure that comb is built neatly and remains easy for beekeepers to inspect.
The Langstroth hive is specifically designed around the bee space principle. Its removable frames encourage bees to build comb only within the boundaries of each frame, without extending beyond the frame depth or into neighboring spaces. In contrast, Warre and top-bar hives provide bees with greater freedom in how they construct comb. As a result, irregular comb formation can occur differently among hive types, although bridge comb tends to create the greatest management challenges in Langstroth hives.
In top-bar hives, bees rarely attach comb to the hive walls, and they do not have access to the tops of conventional frames. Consequently, bridge comb is less common than it is in Langstroth hives. Nevertheless, bees may still build brace comb or other unwanted comb in areas that interfere with hive management. For this reason, Langstroth beekeepers generally need to monitor comb construction more closely than those using other hive designs.
Bee Space Is a Human Concept
Bee space is a guideline developed for efficient hive management rather than a rule followed by honey bees. Bees simply build comb wherever they consider suitable, provided they can move comfortably throughout the colony. Consequently, they may ignore the intended spacing within a hive and construct comb in locations that complicate inspections. Both new and experienced beekeepers should recognize that this behavior is natural and focus on removing unwanted bridge comb while taking steps to discourage its formation in the future.
Why Do Bees Build Bridge Comb?
Several factors can encourage honey bees to build bridge comb. Although it is most frequently encountered in Langstroth hives, it can also occur in Warre hives and, less commonly, in top-bar hives.
Bees are especially active comb builders during periods of rapid colony growth and abundant nectar flow. At these times, they are eager to utilize any available space for wax construction, increasing the likelihood of bridge comb if conditions permit. Even with careful hive management, most beekeepers will encounter bridge comb occasionally. Its appearance is a normal part of beekeeping and should be viewed as a routine maintenance issue rather than a sign of poor management.
1. Uneven Beehive Placement
One of the most common causes of bridge comb is an improperly leveled hive. A hive that tilts along its length or width can influence how bees orient their comb because gravity plays a significant role in comb construction. Bees naturally prefer to build comb vertically and perpendicular to the ground. When the hive is level, the frames provide a reliable guide, encouraging comb to remain straight and properly aligned.
Even when a hive is perfectly level, bridge comb may still develop from time to time. If this happens, there is little reason for concern. Simply remove the unwanted comb during routine inspections and continue encouraging the colony to build comb within the correct plane of the frames.
2. Improperly Manufactured Frames
Bridge comb can also result from poorly manufactured hive components. Frames or hive boxes that do not meet standard dimensions may create gaps larger than the recommended bee space. Bees often interpret these oversized spaces as suitable locations for additional comb construction, leading to bridge comb between frames or other unwanted areas.
Frames and hive boxes are the components most commonly responsible for this problem. Using accurately manufactured equipment helps maintain proper spacing throughout the hive and greatly reduces the likelihood of irregular comb. Whenever possible, purchase compatible hive components from the same manufacturer or ensure that any homemade equipment follows standard dimensions precisely.
Problems Caused by Bridge Comb
Bridge comb does not create any problems for honey bees. To the colony, it is simply additional comb that can be used for raising brood or storing honey and pollen. The challenges arise for the beekeeper, as bridge comb interferes with normal hive management and can negatively affect colony productivity.
1. Difficulty Inspecting the Hive
One of the biggest disadvantages of bridge comb is that it makes hive inspections more difficult. Because the comb joins frames or other hive components together, parts that should move independently become connected. Separating these components without damaging the comb can be challenging. The problem becomes even more significant when the comb attaches a frame to the walls of the hive body rather than simply connecting two adjacent frames.
2. Risk to Honey Bees
Bridge comb can also increase the risk of injuring or killing bees during inspections. Newly constructed comb is soft and fragile, bending easily before eventually breaking under pressure. This is why frames should always be lifted straight upward rather than tilted sideways, particularly when using foundationless or unwired frames. If bridge comb breaks while a frame is being removed, pieces of comb may fall into the hive, crushing bees beneath them. Besides causing unnecessary bee losses, crushed bees release alarm pheromones that can make the colony defensive and increase the likelihood of stings.
3. Reduced Honey Production
Bridge comb represents a poor use of the colony’s resources. The wax, nectar, and labor invested in building unwanted comb could instead have been directed toward constructing comb in the proper locations. Although removed bridge comb can be rendered into beeswax and used for various purposes, the colony must still expend additional energy replacing it. This diversion of resources often results in lower honey yields, particularly in colonies managed for honey production.
4. Wasted Time and Energy
Removing bridge comb is almost always necessary, but doing so means that much of the bees’ work is lost. Whether the wax is recycled within the apiary or processed into beeswax products, the colony must rebuild the discarded comb. If the bridge comb contains brood, those developing bees are usually lost once the comb is removed, further reducing the colony’s strength. For these reasons, preventing bridge comb is far more beneficial than dealing with it after it has formed.
Preventing Bridge Comb
Preventing bridge comb is the most effective way to avoid the management difficulties and production losses it causes. Fortunately, beekeepers can use several proven practices to minimize its occurrence. Although the Langstroth hive is specifically designed around the concept of bee space, improper setup or management can still encourage bees to build comb where it is not wanted.
1. Keep the Beehive Level
Maintaining a level hive is one of the simplest and most effective ways to discourage bridge comb. Since bees naturally build comb vertically in relation to gravity, a properly leveled hive encourages comb to follow the alignment of the frames. While this greatly reduces the likelihood of irregular comb, bees may occasionally build small sections of comb beneath certain frames simply because of their strong instinct to utilize available space.
2. Use Foundation
Installing foundation in hive frames is another effective way to reduce bridge comb. Foundation provides bees with a clear guide, encouraging them to build comb within the intended boundaries of each frame. Both wax and plastic foundation are widely used. Wax foundation is installed directly into the frame, while plastic foundation should be coated with a thin layer of beeswax to improve acceptance by the bees.
Some beekeepers prefer foundationless beekeeping because it allows bees to build natural comb. If excessive bridge comb becomes a recurring problem, alternating foundation frames with foundationless frames can help guide comb construction while still allowing some natural building.
Many manufacturers also offer one-piece plastic frames with molded foundation already incorporated. These frames are durable, provide excellent support for comb, and are highly effective at reducing the likelihood of bridge comb. For beekeepers who are comfortable using plastic equipment, they offer a convenient and reliable solution.
Those who prefer to avoid plastic can achieve similar benefits with wax foundation. Wax foundation is typically reinforced by wiring the frame and embedding the wires into the wax sheet. Although this requires a little extra preparation, it provides strong support for developing comb while helping bees maintain proper comb alignment.
3. Stay Vigilant
Regular hive inspections remain one of the best defenses against bridge comb. During periods of heavy nectar flow, especially in summer, bees produce wax rapidly and may construct unwanted comb surprisingly quickly. Frequent inspections allow beekeepers to detect bridge comb while it is still small and easy to remove. Extra vigilance is also recommended when establishing new colonies, such as after installing package bees, making splits, or introducing swarms, as bees tend to build comb aggressively during these periods.
4. Use Properly Sized Equipment
Using high-quality hive components manufactured to standard dimensions is essential for preventing bridge comb. Properly sized boxes, frames, and accessories maintain the correct bee space throughout the hive, encouraging bees to build comb only where intended. Components that do not fit correctly, such as poorly fitting queen excluders or mismatched hive boxes, can leave oversized gaps that invite unwanted comb construction. Replacing or modifying ill-fitting equipment helps eliminate these problem areas.
5. Correct Minor Misalignment Early
When bridge comb is still in its early stages, it may be possible to correct it without removing the entire section. A small cut can be made where the comb attaches to the frame, after which the comb can be gently guided back into the correct alignment. If this adjustment is made before the comb becomes thick and heavily attached, the bees will usually continue extending it along the proper plane of the frame.
Removing Bridge Comb
Whenever bridge comb is discovered, it should be removed as soon as possible. Early removal is much easier and causes less disruption than waiting until the comb becomes large and firmly attached. A hive tool is usually sufficient for cutting or scraping away unwanted comb, although a sharp knife may be useful where more precise cuts are needed. Allowing bridge comb to remain in the hive only makes future inspections more difficult and increases the amount of work required to correct the problem.
Work Carefully
Bridge comb should always be removed with care because it may contain brood, honey, or stored pollen. Before cutting it away, assess what the comb contains and decide how best to handle it. Removing brood comb inevitably results in the loss of developing bees, while removing comb filled with honey wastes valuable food that the colony has stored.
It is equally important to ensure that the queen is not on the bridge comb before removing it. Carefully brush or shake all bees off the comb before cutting it away, paying particular attention to locating the queen. Accidentally removing or injuring her can seriously weaken the colony. Worker bees are also valuable, especially during periods of rapid comb building when the colony depends on every available bee. Taking a few extra moments to clear the comb of bees before removal helps protect the colony while making bridge comb management much safer.
When to Delay Bridge Comb Removal
Although bridge comb is generally best removed as soon as it is discovered, there are situations where delaying its removal may be the better option. This is particularly true when removing the comb would cause unnecessary disruption to the colony or result in the loss of valuable brood.
Conservation-focused beekeepers, whose primary objective is maintaining healthy honey bee colonies rather than maximizing honey production, may choose to leave bridge comb in place temporarily. As long as the colony can move freely through the hive and the comb does not interfere with essential management, its presence is unlikely to compromise conservation efforts.
Bridge comb may also be left undisturbed when it has formed in the brood chamber and is being heavily used for raising brood. During spring, when colonies are rapidly expanding, removing a large section of brood comb can significantly reduce colony strength. If the comb has already developed extensively before it is discovered, postponing its removal until brood rearing declines may be the more practical decision.
Whenever bridge comb removal is delayed, it should still be addressed at a more suitable time. In brood boxes, this is usually after the peak brood-rearing season, when fewer developing bees occupy the comb. Likewise, conservationist beekeepers often wait until the cooler months, when bees make less use of the comb, before removing it with minimal impact on the colony.
Reusing Bridge Comb
Bridge comb removed from a hive does not have to go to waste. Since it consists primarily of beeswax, it can be processed and used in the same way as any other harvested wax, including for making candles, cosmetics, polishes, and other beeswax products.
Some beekeepers prefer to recycle the wax directly within the colony because producing beeswax requires a considerable investment of energy. Small pieces of clean bridge comb can be placed back inside the hive in a location where they will not interfere with hive operations, allowing the bees to dismantle and reuse the wax for new comb construction. However, removed comb should never be left lying around the apiary, as it can attract ants, wax moths, small hive beetles, rodents, and other pests that threaten honey bee colonies.
Conclusion
Honey bees are remarkably efficient comb builders, but their natural instincts do not always align with the beekeeper’s preferred hive arrangement. Bridge comb is a common example of this behavior and can complicate inspections, damage equipment, waste colony resources, and reduce honey production if left unmanaged.
Fortunately, bridge comb can usually be prevented through proper hive setup, the use of correctly sized equipment, regular inspections, and timely corrective action. When it does occur, addressing it early minimizes disruption to both the colony and the beekeeper, resulting in a healthier hive that is easier to manage and more productive over the long term.