How to build a roof for a beehive for a National hive

Just a quick video on how to buils a simple roof for a National hive.
I always try to use scrap wood so most of the material is out of skips or what i see lying around.
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[@JNeviile]

Appreciate the video for the life of me I could work out how to add a vent …helped me ty

[@alexrochard9269]

Hi could you do a video on national brood box
Thanks