Should I tackle floors or walls first? Does it matter?

I enclosed a long thin upper deck which had sliders onto it from my master and another bedroom and turned it into a sunroom. It is not heated and still has the original deck floor and outside siding on it (and mansard roof shingles). I would like to refinish it and turn it into a 4 season room. My question is about order: should I start with the floors (I will need to insulate, level and then I would like to put in radiant heat floors), or do the wall first, remove the shingles? Any ideas?
I could really use some help.
q should i tackle floors or walls first does it matter, decks, home improvement, Sunroom
Sunroom
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