APS,good advice on the tread rise spacing,but not only is it "tricky" to negotiate,it is not code.All stairs must have the same rise for the reason you stated.
As to Davem,I assumed you put roofing paper on the joists so they would not squeak?I don't know of another reason.I would definately cut your t-111 back for flashing.T-111 has been around for a long time and probably won't be a problem getting it when your ready to change.
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SIKSUKR
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