I've had GutterFilter for two years; every time there has been a heavy summer downpour water cascades over the edge of the gutter. I have 5" J gutters with double the usual number of hidden hangers on a ranch-type (shallow slope roof) house. Along a 60 foot expanse there are two 2X3 leaders. Even with a 2 foot roof overhang, I had water pouring into my cellar through the window well. I had to give up on this approach, since water damage in my cellar is what gutters are supposed to avoid. Before installing GutterFilter, even with somewhat covered mesh gutter guards, I never had a flood in 38 years.
When I removed the foam material I saw that it has held up and that leaves and debris build-up weren't a problem. The downspouts were totally clean. My conclusion is that the fact that GutterFilter takes up so much of the gutter's interior volume makes the effective size of the gutter MUCH, MUCH smaller. In order to take advantage of GutterFilter you must first remove your normal, standard 5" gutters and install OVERSIZE ones (a hidden cost that GutterFilter never mentions). Note that their literature claims that they can handle 24 times the normal rainfall. In a summer downpour in the Northeast there can be 1” falling in 10 minutes, or 6”/hour – easily within the capability of normal 5” gutters. For GutterFilter to have failed at this low rate means that their claim seems to be unjustified. I’m asking for a refund.
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