28 should about do it.
Your deck measures about 1.8 m x 5.6 m (very roughly) Without knowing the actual dimensions of the blocks or the pack size, you might get away with as few as 25, depends how many you have to cut to fit a metric product to an imperial deck!
If you get 28, you will nave enough to finish the job
where I live the answer would be zero since they would not meet any building codes
I am building a deck that measures 18 feet long x 6 feet wide. The Handi block site says a 3m x 3m deck will require 21 blocks. How many will I need for my deck?
