I posted this for a similar thread on hearth.com:
We used Fiberon composite decking on ours, now about four years old and still looking good. It has the grooves for use of hidden fasteners. If you use that type of fastening system, however, be sure the deck framing underneath is adequately braced against racking. The use of hidden fasteners doesn't provide suffient racking resistance. When selecting a product, check also the maximum allowed joist spacing. Some require no more than 16" oc, or 12" if the decking is laid diagonally to the framing.
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