"THE SEALED ROOM" 3lbs A LIGHT

[thebullfrog]

Then I screw 2 sheets of OSB 4x8 sheets to the bottom (sort of like a water bed box).
I line the inside with polly making sure not to get any staples on the inside of the beds.

What is OSB and where can it be found? What is 'polly' and how do you staple it to the box?