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cheap as chips Amazon tunnel
How has the cover held up and for how long? I'm assuming it's the stuff that's reinforced with mesh? That seems to be the case for the cheaper ones, probably because taughtness, or the lack of it, is less of a problem. I've read stories of all the plastic degrading and blowing out leaving just the mesh.
Polygon
RagnarHairybreeks
Most polytunnels have a foot or so of extra material. Normally this is folded into a trench outside the footprint and buried to hold it down.
Internally I also drove metposts into the ground next to each upright and wired the uprights to lengths of 3x3 to stop the frame flexing in the wind (and work hardening = snapping).
I also did a bit of triangulation around the frame internally with more lengths of tube and duct tape.
I can see wooden framed raised beds replacing my posts if they are along the sides and wired to the uprights?
Anyway, my cheap as chips Amazon tunnel is huge and has weathered quite a few storms on our wind tunnel of an allotment (north south orientation, both allotments and tunnel).
Worth going the extra mile to avoid the heartbreak of turning up and finding it smashed - or worse. The tunnel on a neighbouring plot just disappeared a few weeks ago!