When the space between two surfaces in the hive is the right size (bee space), the bees will respect the space and leave it free as their passageway. But if the space between any two surfaces in a hive is much less than 3/8 inch (for example, less than 1/4 inch), the bees will quickly seal the gap with sticky propolis (a resin-like substance the bees manufacture to seal cracks and gaps in the hive). If the space is much larger than 3/8 inch (for example, more than 1/2 inch), the bees will fill the space with extra wax comb.
Either way, violating the bee space results in a colony that you can't easily inspect and manipulate because the bees have effectively glued everything together!
You want to adhere to this bee-space concept as you build your hives (in other words, the gaps between surfaces are never more or less than 3/8 inch).
Two types of bee space exist. The 3/8-inch bee space your colony uses to move between hive bodies (frame boxes) can be designated either at the top or bottom of each hive body:
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Top bee space means the passageways between hive bodies have been designated above the frames.
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Bottom bee space means the passageways between hive bodies have been designated below the frames.
If you decide to purchase equipment from a beekeeping supply store to use with the hives you build (such as frames, hive-top feeders, and so on), be sure to confirm with the vendor that the products you're buying are compatible with top bee space.