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Why is my air filled arch made with aluminium rod sagging in the middle?

by Shelia Montgomery
(Humble,TX)

The arch is not arch shaped. It is swinging down in the middle.

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Arch sagging in the middle
by: Margit

Hi Shelia,
As I don't know any specifics about your arch and haven't seen a photo it's difficult to tell. The most common reason for sagging in the middle is that the frame is not sturdy enough to support the weight of the balloons. Whereas for smaller and hanging designs, the 1/4" aluminium rod is strong enough, for a self-supporting walk through arch you will need 1/2" aluminium rod for the frame. If the frame has to be extra sturdy (e.g. for outdoor arches), I would even recommend using 1/2" conduit. It's more difficult to work with, but it will give your arch the sturdyness it needs.

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