Gutters are commonly used along eaves at a lower end of a sloping roof to catch water running off of the roof and channel that water into particular areas rather than allowing the water to merely fall from the lower edges of the roof. Such gutters often become clogged, especially when trees are located nearby and shed leaves which can end up in the gutters. Accordingly, leaf preclusion systems, often called “gutter guards,” are known in the prior art for attachment over the gutters. Such gutter guards serve the basic purpose of allowing water to pass into the gutter but precluding leaves and other debris from passing into the gutter.
One type of gutter guard utilizes a filter layer which has small openings therein which allow water to pass through but which preclude leaves and other debris from passing therethrough. One example of such a prior art mesh based leaf preclusion system is in U.S. Pat. No. 7,310,912, incorporated herein by reference.
The phenomena of water tension and molecular adhesion forces tend to cause water to not want to pass through such mesh layers, but rather to cling to the mesh. These forces thus frustrate the ability of mesh based gutter guards to allow water to pass through the mesh while precluding debris from passing into the gutter. With known prior art mesh based gutter guards, commonly an underlying support is provided beneath the mesh. This underlying support serves two purposes. First, it keeps the mesh generally planar overlying the gutter. Second, it contacts an underside of the mesh providing a path along which water can flow while adhering to the underlying support. Holes in the underlying support then allow water to drop through in larger drops where the weight of the drops is sufficient that the surface tension and adhesion forces cannot resist such dropping.