The invention relates to roofing, and, more particularly, to metal flashing used in roofing applications.
The installation of one roofing system over another is described by Folkersen, in U.S. Pat. No. 6,023,906. More specifically, Folkersen describes the capping a conventional drip edge with a new drip edge in the context of a roofing system overhaul.
A drip edge is a material applied on a roof's edge to give water the ability to filter out of the roof system, and is typically made of a non-staining and non-corroding material. Said another way, it is a type of metal flashing located at the edge of a roof. A drip edge is installed with an intended tilt, which is specifically meant to direct water away from a roof.
It has been discovered that, when the method of capping an existing drip edge with a new one is employed, the drip edge fails to provide adequate protection to the roofing system.
A typical, prior art drip edge is shown in
Furthermore, when using this style of drip edge, it becomes difficult for the installer to see the face 104 of the drip edge, in relation to a perpendicular angle relative to the nailing flange 103. This also frequently results in an installation where the flat face 104 of the drip edge is not perpendicular to the nailing flange 103. The result is that water flows down the face 104 of the drip edge, rather than falling off an edge 101, again, severely reducing its effectiveness.
Still further, a roofer typically installs a drip edge from a roof top, which limits the installer's ability to notice the bottom face 106 pulled away from a parallel profile, relative to the nail flange 103. As such, water that travels off of the roof and down the flat face 104, continues along the bottom face 106, and drips behind gutter 107. The water bypassing the gutter 107 often results in numerous moisture issues arising.
Still even further, any twist in the flat face 104 creates an elevation in the nail flange 103 at various locations along the interface of the drip edge and the first roofing system 109. This condition is known as “oil canning” 105, which is evident in the face 104 of the drip edge and results in a secondary problem of drip edge nail flange 103 elevation from the flat plane of the first roof surface 109. As such, when moisture flows from ridge to eave, the elevated nail flange 103 is prone to water entry.
Also, when two separate sections of a drip edge come to a point, such as a peak of the roof, the drip edge 101 profiles no longer match, creating an unsightly finished product.
Lastly, when the drip edge 101 has been installed improperly, due to twisting in relation to the fascia 102, the roofing material needs to follow this line, which can cause an unsightly completed edge.
In addition to asphalt shingle systems, metal roofing systems can also be installed over shingles. The more common metal roofing systems are standing seam and metal shingle systems. These systems rely on the drip edge as a means of roof panel securement. In order to install a typical drip edge that provides for metal roof securement, the existing drip edge needs to be removed. As such, the roofer needs to spend additional time to remove debris and bring further tools to the site to remove the existing drip edge.
In general, it can be said that the current drip cap technology is not adequate for second layer roof installations. In addition to being unsightly, the resulting water flow off the roof tends to bypass any gutters, causing the gutter system to fail to perform its function adequately. These issues may not become evident for years but eventually lead to rotted sheathing and fascia, staining of siding, and even soil erosion and basement flooding, in extreme cases.
What is needed, therefore, is a drip edge and method of using the same that allows for the capping of an existing drip edge, including those used for metal roof securement, in a way that provides adequate protection to the roofing system.
The use of a drip edge when installing a roof is commonplace. The drip edge is typically installed along roof eaves and rakes. The drip edge closes the gap between the exposed roofing system and exterior trim materials. In terms of moisture, the drip edge moves water further from the structure, typically into a gutter. In addition, during high wind events the drip edge adds rigidity to the completed roofing system at critical periphery areas susceptible to wind up lift.
Furthermore, in some metal roofing installations the drip edge gets wrapped with the exposed finished roofing materials at eave and rake locations providing for metal panel securement.
By adding a protruding edge to a drip edge from which moisture can drip, the method of capping an existing drip edge with a new one may be safely employed and will result in adequate protection of the roofing system.
The features and advantages described herein are not all-inclusive and, in particular, many additional features and advantages will be apparent to one of ordinary skill in the art in view of the drawings, specification, and claims. Moreover, it should be noted that the language used in the specification has been principally selected for readability and instructional purposes, and not to limit the scope of the inventive subject matter.
We herein disclose a roof drip edge having a protruding leading edge useful for second layer roof applications. As shown in
Now referring to
Furthermore, the protruding edge 202 of the drip edge ensures a true point at the peak of a roof, resulting in a uniform appearance.
Still further, the resulting protruding edge 202 maintains a stiff, straight line 207 for the finished roofing material to follow. On metal roofing applications the protruding edge 202 also permits for metal panel and shingle securement.
The metal mills or gages of the second layer drip edges may, in embodiments, be thicker or heavier, as the drip edge face 205 is not in contact with the fascia 102 itself. This adds strength to the detail and prevents additional twisting tendencies. We recommend fabricating the disclosed drip edge from 24-27 gage steel or 0.032 aluminum.
As depicted in
The notch may be made on-site using tin snips or during the manufacturing process, by punching out the required material. The length of the notch is typically the length of the blade on a pair of snips, to ensure consistent overlap from section to section.
On standing seam and metal shingle applications, the drip edge should be of a heavier gage or thickness. In such instances, embodiments include divots for fastener placement. On these systems, screws are typically used to fasten the nail flange 1 to the underlying roof or substrate. Since a screw rotates when being installed through the nail flange 1, it will tend to wander across the flat surface thereof. The divots prevent the screw from walking across the surface of the nail flange 1 during installation, ensuring proper alignment. A divot will let the screw grab the nail flange metals, due to its countersunk nature. The placement of the divots further permits the panel manufacturer to call-out the specific rate and placement of fasteners to prevent wind uplift at critical perimeter locations and improve compliance with manufacturer recommendations and code requirements.
The drip edge, in embodiments, is fastened through the nail flange 1 at rates consistent with performance requirements for wind uplift. To provide for consistent fastener placement, a series of divots can be placed at a specific rate into the nail flange. By manufacturing only a divot, as opposed to a hole through the entire nail flange, creating a point of water entry should the feature not be utilized is avoided.
It has also been discovered that, on occasions, capillary action can occur with some metals and profiles that direct the water coming off the roof to a specific area of the drip edge. This phenomena is exacerbated on shingle installation work where starter shingles are used and installed onto the drip edge.
Starter shingles typically come in 36″ or 39⅜″ lengths and abut each other. This abutment of the starter shingle to starter shingle can capture and channel water to a specific location on the drip edge. This effect, in addition to capillary action, releases water at specific locations onto the underlying drip edge.
The cohesive properties of water in relation to the volume of water being released at specific areas on the drip edge can cause moisture to track along the face 205 and the underside of the drip edge 208 bypassing any gutters 206. As such, it has been discovered that, as highlighted in
Furthermore, it has been discovered that a groove, as shown in
On asphalt shingle applications, it would be desirable to have the groove of
The encouragement of second layer roof applications remains a “green” alternative. There is a substantial movement towards shingle recycling and keeping the existing shingles on the roof through another roofing cycle, as more communities come on board with shingle recycling efforts. In addition, second layer applications are cleaner, saves the owner money and the roofing contractor time.
The foregoing description of the embodiments of the invention has been presented for the purposes of illustration and description. It is not intended to be exhaustive or to limit the invention to the precise form disclosed. Many modifications and variations are possible in light of this disclosure. It is intended that the scope of the invention be limited not by this detailed description, but rather by the claims appended hereto.
This application claims the benefit of U.S. Provisional Application Nos. 62/658,802, filed Apr. 17, 2018, and 62/643,335, filed Mar. 15, 2018. Each of these applications is herein incorporated by reference, in their entirety, for all purposes.
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