I want to float my 5/8" solid bamboo over a concrete slab. I've lived
in the house for 14 years and tested the slab and there is no moisture
coming up. My plan is to glue the planks together and float them over
a moisture barrier. I don't want to add a subfloor and nail the floor
down. Is there any reason I can't take standard bamboo planking 36" in
length and float it as described above? Are there any disadvantages to
doing this?

Thanks