We are planning our next project: A rooftop terrace.

We would like to use the full wide of our roof, our city impose non combustible (not A rating) elements withing 1.2m from property limits, so I'm looking for our options and so far I have:

  • Aluminium decking
  • Porcelain tile
  • fiberglass decking
  • Plastic wood

is there anything you see I might have forgotten?


  • Steel is non combustable, square tube framework with thin sheeting for the deck that can be coated so its not slippery or use diamond plate. – Ed Beal Feb 2 '18 at 17:29
  • Any idea what the Code requirement is based on? Burning embers from wildfire catching your house on fire? Firemen needing a stable surface? Darn shame they don't make walk-on solar panels, you're going to pay a fair bit for a surface, if only you could get one that pays you back! – Harper - Reinstate Monica Feb 2 '18 at 17:49
  • I'm downtown Montreal... so for the wildfire I would vote no, I guess it's required to have combustible elements away from your neighbor house to avoid fire propagation. That is why I said property limits which in my case is my neighbor's wall. – user1064038 Feb 2 '18 at 18:34

Concrete. Does depend on the structure being able to support it. Quite common in commercial roofing, though.

I don't think fiberglass (which is glass fibers in a plastic matrix) nor plastic wood would qualify as non-combustible. Both burn quite well, with a horrible stench.

| improve this answer | |
  • Depends on the epoxy/etc. used to make the fiberglass. Actually, a variety of 2-part plastics can be used, Tap Plastics has quite the smorgasboard of FRP-able plastics. – Harper - Reinstate Monica Feb 2 '18 at 17:48
  • I didn't put concrete as I don't think my roof will be able to support it. – user1064038 Feb 2 '18 at 18:06

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