Screened botton board . . .
This year we will add bottom boards with ventilation. There are free plans for the Langstroth Beehive at Bee Source.com. You can also ffind downloadable “build-it-yourself” plans for a Langstroth Beehive there.
Our local hardware stores, farm coops & beekeeping supply store do not carry #8 hardware cloth. Here is a source on Amazon.com.
Redi-Roll Hardware Cloth, 1/8" x 36" x 10'
Redi-Roll Hardware Cloth, 1/8" x 48" x 10'