![]() I'm editing a sketch to explain these details and will add that here. That flange provides a base for nailing the drip edge to the sheathing.Ī vertical drip edge lip extends down roughly 1 5/8" and as Steve points out, should not be set tight against the fascia board or water may run behind the gutter and down the fascia, inviting leaks and rot. Indeed if the drip edge isn't wide enough and if there are gaps at the very edge of the roof sheathing where it meets the fascia, a 2 3/4" wide drip edge may not give enough metal to nail up into the roof sheathing.įor other readers, Steve's "Length" does not refer to the 10-foot long dimension of drip edge but rather he's referring to what I call the on-roof width or wide flange that must lie on the roof sheathing surface and extend up under the first course of shingles. Minimum drip edge end laps: 4", offset by at least 6 ft.īy (mod) - standard roof drip edge dimensions - need to be increased for some you for those helpful added details on increasing the roof drip edge width (per my sketch shown here) when the roof edge is extended by a wood strip.Minimum extension of drip edge up the roof decking: 2".Recommended drainage gap: 1/4" (approx) spaced off of the fascia board.Our sketch shows the most-common or "standard" dimensions of roof drip edge used in North America: Most of the roof runoff is going off the roof not down the fascia board. The brown drip edge is properly installed and is doing its job. If there is a gutter, water leaving the lower roof edge is directed into the gutter, not behind it, not down building walls, not where we don't want it to go. If there is no gutter, water leaves the edge and zooms out into space away from the building Our photo above shows what we ask of roof edges: Usually you won't see much of drip edge as it's under the roof shingles, under the underlayment, and behind the roof gutter.īut where no gutters are installed you might get a peek. The sketch above illustrates the end-profile of roof drip edge flashing and shows its placement on the roof. Lengths of drip vary but typically it's sold in ten foot lengths (120"). ![]() The drip edge also gives us a nice straight edge with which to align roof shingles, slates or other roofing material.ĭrip edge varies in dimensions but typically the flange that nails to the roof surface is about 2.5" wide and the vertical edge that directs roof runoff down and away is about 1.5" in depth. Without this detail water leaving the roof edge wants to run down building fascias, soffits, and walls, sometimes even entering and damaging the structure. ![]() Roof drip edge flashing serves multiple functions on a building, the foremost of which is to assist water in leaving the roof edge with minimum damage to other building components by directing the water off of the roof and into the gutter. Roof Drip Edge Flashing at Roof Eaves & Gable Ends We also provide an ARTICLE INDEX for this topic, or you can try the page top or bottom SEARCH BOX as a quick way to find information you need. This article series discusses roofing installation, including roof sheathing, roof underlayment, roof coverings such as shingles, slates or membranes, and roof flashing. We explain where drip edge flashing should be installed, in what position, and we describe the placement of drip edge flashing beneath roofing underlayment or ice and water shields & shingles or other roof coverings. This article discusses the requirements for roof drip edge flashing. Is drip edge flashing needed? How & where should it be installed on roof eaves & gable ends? Roof drip edge flashing installation requirements: ![]() We have no relationship with advertisers, products, or services discussed at this website. InspectAPedia tolerates no conflicts of interest.
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