I am building a small deck out of 130x22 jarrah going over seasoned 100x50 jarrah bearers/joists
I will be using stainless decking screws but wonder what is more important to use

1- maxbond between the joist and board for strength and to avoid cupping
or
2- bitumous dampcourse rolled out between the joists and boards to assist with any moisture/rot issues

cheers guys


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