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What made you go for a full upstand with internal drain rather than gutter?
At some point (likely next year at this rate), I'll be putting a growing roof up there, which means 60ish mm deep of stuff (geo-textile, reservoir sheet, sub- and soil) - Having an upstand means it won't all just fall off at the edges.
I'm not looking forward to fitting the doors (from slideandfold.co.uk) as in addition, I'll need to drill through 5mm steel to fit them.
NotThamesWater
What made you go for a full upstand with internal drain rather than gutter?
Do you know where you're getting your bifolds from?
I installed mine at the weekend. Goddamn that was a ballache. Got the frame perfectly laser aligned, fitted the sashes and had no end of difficulty getting the bastard traffic door to close properly without catching. Ended up tightening/loosening screws to pull the frame back and forth until it kinda just happened. No science to it at all!