From the video: Practical Beekeeping Part 3
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This inner cover has a lower relief entrance and an upper entrance. On a strong colony during summer, the lower entrance is opened for better honey ripening, vertical ventilation, and relieving the lower entrances. When not needed, it is closed with a plug.
It is made from spruce board 1 cm thick. It has an opening for a round 2-liter feeder. A thick plastic sheet is placed over the board so the board does not absorb moisture from the patty. The patty, board, and fiberboard together serve as insulating thermal material throughout the entire winter. The total thickness is about 26 mm — it is important that the inner cover always be thicker than the hive walls.
Patties are prepared in autumn (November), but are not activated until the first spring cleansing flight — this is usually mid-February. Activation is simple: remove the feeder plug, replace the plastic sheet, close the cover — and the patty is activated. The bees consume it normally.
When wild cherry, apple, and plum trees bloom — and liquid feed is needed — a scalpel is used to cut the plastic sheet and a feeder is placed. The bees are already on the patty, so as soon as access is opened — they immediately use the syrup as well. In this way, the colony simultaneously consumes both liquid and solid feed.
If patties were not prepared in autumn, a piece of styrofoam 1 cm thick can be placed instead for insulation.
During the active season, when a mating nuc, nucleus, or swarm needs to be made — the inner cover is placed on the brood box and the upper entrance is opened. This creates an auxiliary bottom board for a shallow super: a frame of sealed brood is inserted, bees are shaken in. Older bees return down to their entrance, while young bees and brood remain above.
A queen cell is added, the queen mates, her quality is assessed, she is moved where needed or replaces the old queen. When finished — everything is reassembled and the board serves as an inner cover again. This way, under every roof there is an additional bottom board during the active season, without extra equipment.
The divider board consists of three interchangeable parts:
During the season, depending on the need, the appropriate insert is used — for directing bees from the brood box to the honey super and suppressing the swarming impulse.
The Canadian bee escape is made from fiberboard with mesh. It is placed 24 hours before removing the honey supers for extraction. The bees pass down into the brood box, freeing the honey above — and the super can be removed without difficulty.
The Roshus bottom board is divided into three compartments — a center one and two side ones with separate entrances. It is used in combination with the inner cover for efficient queen rearing.