"This solution is similar to triple glazing. In our case, support is provided by a frame made from PVC piping. Around this frame, we wrap a single sheet of polyethylene. We secure this polyethylene using the insulation noodle attached to the frame. We then wrap the outer frame using more polyethylene. This results in a triple-glazed polyethylene sheet. In case you wish to protect against rain and other elements, you can strap a sacrificial sheet to the outside of the window."
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