Burr comb in the context of "Propolis"

In beekeeping, a Langstroth hive is any vertically modular beehive that has the key features of vertically hung frames, a bottom board with entrance for the bees, boxes containing frames for brood and honey (the lowest box for the queen to lay eggs, and boxes above where honey may be stored) and an inner cover and top cap to provide weather protection. In a Langstroth hive, the bees build honeycomb into frames, which can be moved with ease. The frames are designed to prevent bees from attaching honeycombs where they would either connect adjacent frames, or connect frames to the walls of the hive. The movable frames allow the beekeeper to manage the bees in a way which was formerly impossible.

The key innovation responsible for the hive's design was the discovery of bee space, a gap size between 6.4 and 9.5 mm (1⁄4 and 3⁄8 in) in which bees would not build burr comb, nor fill the gap with propolis. Modern Langstroth hives have different dimensions from L. L. Langstroth's beehive that was originally patented in 1852 and manufactured until circa 1920, but retain the main features of allowing bee space, as well as easy access, which works well for the bees, but also makes management of the beehive easier for the beekeeper. The standard beehive used in many parts of the world for beekeeping is based on the Langstroth hive.