Hey Phil, what are you going to do for joists under the decking? I assume you're just going to do what they did before and lay down floating 2xs.
You might want to cut some extra strips from the 90# to use as pads under them, so they aren't sitting directly on the roofing material. That way any wear from friction should occur on the strips. If you have enough room, you might even buy a sheet of 1/2" fiber board an cut strips out of that.
I thought of that after I talked to you the other day. Hope I'm not too late with the suggestion.
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