I have got this far with a deck around an existing concrete slab. Have used 200 x 50 and 100 x 100 F17 unseasoned hardwood as in picture. Have coated with decking oil. Am about to fit 100 x 50 bearers (also F17) but have been thinking about shrinkage. If I get too pedantic about getting 90 x 19 merbau as close to current concrete edge as possible, will it just shrink below anyway. Or do I make it higher now and wait for gravity to provide the perfection. If I have to pack up the joists what should I pack them with. Any thoughts appreciated!

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