A: 189 pcs in a bundle, call your local store for bunk pricing
A: please consult your local building codes for instructions because regulations on floor joists sizes and spacing vary from project.
A: Not treated. Not good for ground contact. If you want it to last you will have to paint it.
A: This wood is not chemically treated. You can paint any part of the wood that will not be in direct contact with the food. examples...legs of the bed
A: I guess so.They are strong but lighter than treated wood.I used it for framing and it's very strong
A: please consult local building codes as they differ from region to region.