I used a block called Dek-Block and I was able to use it to build a pool deck 16X20 at a height of 28 inches. The deck has gone through a winter and the deck is still level. So if you are going t build a free floating deck lest then 60 inches then using block will work. For those who may doubt me I have posted some photos of my deck her at http://decks.hemmingsjones.com seeing is believing.
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