6mm exterior top quality BIRCH plywood framed with ¼" x  ⁷/₈"  white wood laths. Bee space one side only for National bee hives. Has two cut out slots for two plastic porter bee escapes, ().

This board provides good insulation when in its usual position above the top super and below the roof. It is also used when clearing the bees with porter escapes. When feeding bees, the feed is placed directly over one of the slots if using a rapid feeder, or both slots if using a bucket contact feeder. In the winter, the crown board is often placed directly over the brood body.

Stewart and Gibson Ltd, 25-27 Main Street, Ballynahinch, BT24 8DR