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roller door
Just thought I'd give my opinion on roller door as a roof.
The roller doors are under tension so that as the doors travel down more tension is applied as a balance to gravity (via springs)to keep the door from accelerating down out of control also to keep the roll tightly wound.
When they are mounted horizontally the spring keep pulling more tension on to roll as the door is pulled down and is not counterbalanced by gravity. So as the 'curtain' is pulled shut there is a LOT of force by the time you pull it across as your roof, and if you dont use enough tension at the least tensioned point of travel the door will not roll up.
Oh and by the way I am a garage door installer.
There is a way to install them horizontally using counterwieghts instead of springs but it makes a simple idea very complicated.
Also there are water drainage issues.
I have had a lot of success using sectional garage door tracking systems for observatory rooves that work great, even when automated. I don't know why more people dont use them.
Brett
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