What a single-layer gutter guard is
Most gutter guards put one filtering layer across the top of the gutter: a screen, a cover with holes punched in it or a single sheet of mesh, held in a frame that slides under the shingles or fastens to the gutter lip. Water goes through the openings and larger debris stays on top.
With one layer, everything rides on that single surface. Fine material that gets through the openings, like pollen, oak tassels, roof grit and blown sand, goes straight into the gutter channel.
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