immihunk, not sure what you mean by "strong enough to guarded". Are you looking to do a roof top garden? What is your objection to wood decking? It is strong, lightweight and will make a fine deck surface that allows drainage. We've don a few with removable panel systems for cleaning and maintenance. I'll monitor this discussion and maybe you can fill me in?

Probably not, this is just an ad.

I'm a Certified installer for Trex decking. Trex Transcend is encapsulated board, with a finish that resists staining, scratches, mold and has a high definition wood grain surface. I don't know what you did to it or whoever worked on your house did something to it, but Transcend decking does not need staining or painting and the protective shell protects decking against fading. Trex Transcend and a few other Trex decking products like Trex Enhance, and Trex Select, they cannot be painted or stained. The only thing can be painted is Trex Transcend White Railings and you should only use light color paint. If you use dark colors, it will absorb heat and it will damage the surface and you can kiss your railings good bye. Also high quality fast drying primer should be used and you have to use Oil or Water based exterior paint and most importantly surface prep is the the key. When it comes to painting specialty surfaces like Trex Railings, hire a Pro to do the work. With that said, if you installed Trex yourself, you have to go to the store and have a Trex representative come out and check your deck. They will determine if loss of color fading was due because of negligence or not. If its a material defect, they will cover the material cost. If you had a Certified contractor do the work, they will cover material and labor. Call your contractor and he will get a Trex Rep to come out within a few days. Good luck

Deck is outside, marble inside... you can use wood or composite, its done that way all the time and that is the most common materials... with that said you can also use Aluminum Decking, PVC Decking, Stone or Tile Flooring System, etc. Good luck