hi guys ive gone and ordered me a nice log cabin and should arrive in the next 3-4 weeks ,ive got to supply the 2 by 3 joists on which it is to lye on (pressure treated ). these will lye on my slabs ... question is water and rot and how to keep at bay ,i was thinking of enclosing the joists in a long bag and sealing it up but just to leave a couple of holes in it to let them breath and sit the cabin on top ,would that be ok or is there a better way