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The springs are internally mounted on roller doors, you cannot see them by looking at the outside of them. Have a look from the end of the door and there is a wheel with a spring hooked on it and the other end of the spring is attached to the shaft which runs the length of the door.
The only roll up doors that do use springs that I know of use counterwights with internal straps eg dmf rapid rolls (think $20k) and old shutter type doors.
I suppose you could put a drip rail on the underside of the the overhanging curtain to stop water travelling on the underside.
The above issue with counterbalance would be the issue.
Brett
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