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Title: Make sure they go on PVC gutters!
Review: We had the roofer install these on all our aluminum gutters when our Virginia 2-story(w/porch) was re-roofed.Initially, we couldn't have been more pleased with them. BUT, after a full year and exposure to the sun, 99% of these screens detached themselves from the gutters, warping into "U's"! Obviously, they all will need to be replaced!The only explanation that makes sense is that the different expansion rate of materials (aluminum gutter - vs - plastic screen guard) causes this problem.Unless you are in a VERY shady place that doesn't get warm, use disimilar materials at your own risk!
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