Sealing Gap on Vinyl Casement Window
One of the windows in my house has a manufacturing defect that makes the frame not square. This is an operable, casement window, and since the operable part is square, the result is a gap at one corner that won’t seal; it’s about 2-3mm wide at the corner, narrowing to nothing maybe 30cm away from the corner.
After years of trying to get some sort of solution from the manufacturer, I’ve given up. The first couple of winters I just taped that window closed; last winter I used temporary “draft seal” sealant.
My idea for a long term fix (ok,hack) is to adhere a strip of plastic to the top of the operable window which will bridge the gap and make contact with the sealing gasket on the frame. I’ll stick it on there with wet-grab no-more-nails for air sealing and some structure, and also screw it down for main structural attachment.
If someone has a better idea, I’m happy to hear it, but mainly I’m just wondering which plastic I should use. Vinyl would make sense, but finding square stock of it has proven difficult. The readily available options are HPDE and clear acrylic (polycarnonate, I think). Is either of these better in terms of adhesion. The HPDE will blend in better visually, but I have my doubts about any adhesive sticking to it. It also might be too flexible.
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