I would like to cover an exisitng 12 x 12 slab with 2 x 6 decking. I have 2 questions. Should I lay tar paper on the slab first and then shoot the treated 2 x 4s in to the slab ? Is it a bad idea to lay the base treated 2 x 4s flat?...Height may be issue, but I don't want the 2 x 4s buckling. Would the weight of the 2 X 6s enough to prevent any warping of flat 2 x 4s?
I live in be southern New Jersey where the temp can get down..but not to New England levels.
Any help will be appreciated.