Semi OT Roofing mat'l for a roof deck - old victorian home

Folks -
I am going also to post over at Fine Homebuilding, but am looking for feedback. We have torn out a leaky 2nd story flat roof deck (apx 350 sf) and are fixing rot and "issues". We tore out an old redwood deck that was atop the hot mopped rolled roof and need to go back with something that isn't going to cause trouble.
Do any of you have any recommendations for roofing material. Initially, we were going to put a floating deck atop the new rubbery membrane torch down roof, but the contractor said if it leaks, then you'll have to tear the deck out just to fix it and into it for that much more $$$.
There's a material similar to those spray on truck bed liners that *may* be suitable, but I am worried about flexibility with wood and structure movement.
I can't be the first guy that's repaired a roof leak on a roof deck, and had these questions. Ideas???
John Moorhead
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John Moorhead wrote:

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