Trex decking is done....had to replace some of the pressure treated joists that were crowned upside down causing a dip in the floor. We are not using the hidden fasteners and grooved decking that is commonly used....all solid edge...face screwed and plugged. Joists are all 12" o.c....adds up to a lot of screws and plugs.
On decks over twenty feet where deck boards have to be pieced in length..... we have found that the grooved decking with hidden fasteners allow the boards to expand lengthwise and slide apart....opening the butted joint.....when they contract....the joint stays apart.
I don't like the hidden fastener decks. I have built quite a few and the face screwed decks hold up better. JMO
Those little plugs that cover the screw holes....and there had to be thousands on this deck.....have to be inserted with the grain going the same direction as the deck boards.....and they become almost invisable....and if you dont take the time... they are clearly visable.
Glad to be done with this deck.......been kinda hot the last few days working there in the full sun.....tired me out.
42" high railing.... posts were less than 6' apart ...very sturdy.