For each overhang distance, there were two trials conducted to determine the repeatability (T1 and T2) at the flow rate of 15 L/h (3.9 gal/h). 2. However, city requirements may vary from one area to another. overhang had greater measured water-shedding capability when compared to the 20-mm (0.8-in.) Using roofing tar or felt, cover the exposed nail heads. Trevor Trainor, M.A.S.c., is an associate at BSCI/BSL. Common drip edge locations include: In older buildings, drip edges were often integrated with architectural details in these locations. A horizontal copper pipe with evenly spaced holes was used to supply and distribute water to the 1220-mm (48-in.) An overview of drip edge design Drip Edge Extension for extending drip edge. Due to the somewhat unpredictable behaviour of water flow, the test repeats show some variation. With a drip edge, it should be around 3/4″. Following the tests on metal drip edges, a slightly sloped (i.e. Common drip edge locations include: windowsills; window head flashing; parapet, post, or … Therefore, the evaluation criteria for vertical distribution for this testing was determined based on the relative results of testing. overhang distances. The data also shows that typically a 45-mm overhang distance performed better than a 20-mm overhang distance. Water on the surface or penetrating the building enclosure’s outer layers can cause corrosion and decay of sheathing and cladding attachment systems, staining and discoloration of cladding systems, and freeze-thaw damage to masonry materials. The data in Figure 5 shows all the thin 20-gauge drip edges with a 45-degree kick-out shed more than 90 per cent of the water applied in the first 1.2 m (4 ft) of collection. There is a small size metal rim facing outwards and away from the roof fascia. FIND A DISTRIBUTOR. In addition to meeting water-shedding requirements, the drip edge must be strong and stiff enough to hold its shape in wind, rain, and cold weather exposure. Drip edge is a metal flashing that tends to overhang the sides of a roof. Five metal troughs of 68 mm (2 2/3 in.) The water must be shed evenly along the horizontal edge to avoid concentrations of running water on surfaces below. Evolution of Cork Flooring: From pushpins to fashion-forward design, Good acoustic design is half the battle in multifamily dwellings, Lessons learned about zero-net-energy buildings. Drip edge is installed under the shingles at the roof line to ensure water runs off the roof's edge and into the gutters. Step Five: Cut the entire drip edge by your second mark, so that it only hangs past the edge by an inch. Sign-up for your account with Construction Canada. Free delivery with $45 order. However, there has been little research on the effectiveness of different drip edge designs. This flashing has a Hemmed or Safety Edge for a smooth finish. In older buildings, surface detailing and the use of heavy stone and masonry wall assemblies have traditionally managed rainwater quite well. in height, followed by three of 203 mm (8 in.) Then again maybe rocket science is not that difficult. 4.6 out of 5 stars 30. Yes you should always put a flashing over the top of a window, called a Drip Cap. If you have installed a drip edge flashing, you should have between half an inch and three-quarters of an inch of shingle overhang. This product has a drip edge which helps direct water away from the building. During the test of the stone windowsill drip edge, no water was collected in any troughs at the 20-mm (0.8-in.) Modern building enclosures should be designed to minimize the rainwater load and protect openings and penetrations by: A drip edge is a common water management detail that assists in both deflection and drainage of water from a building enclosure. Get free shipping on qualified Door & Window Drip Cap products or Buy Online Pick Up in Store today. A commonly observed location for this type of issue is below windows—the window glazing collects and concentrates driving rain down onto the windowsill where the sill flashing drip edge drains the water onto the wall surface. For example, it would be better to use 12 gauge without a hemmed edge, compared to a 20 gauge with a hemmed edge, especially when the overhang distance is small. This means on the 20-gauge drip edge less water is projected toward the cladding and the water falls more vertically than the 12-gauge hemmed metal drip edge. Get it as soon as Mon, Feb 1. overhang performed similarly or better than the 20-mm (0.8-in.) Water must be collected from surfaces above, or at a horizontal edge, and then directed outward, away from the building enclosure. The rain intensity was chosen based on an analysis of Toronto’s hourly climate files for the years 1965 to 1989; for this data, 94 per cent of driving rain occurs in events with an intensity of less than 3 mm/h (0.1 in/h). Pry up or remove a row from top side of window. So depending on where you work and what code prevails in that area of the country, metal drip edges still may not be required by code. A 1.2-m (4-ft) wide and 1.2-m tall ‘wall’ was constructed to accept different windowsill and flashing details. A window sill is the bottom piece of trim, or the ledge at the bottom of the window. overhang of the same design. because no water was collected at the smaller 20-mm overhang with a slight slope (i.e. The study described in this article produced several key findings related to the effectiveness of different drip edge materials, profiles and overhang distances: One practical conclusion is better drip edge performance can be achieved by increasing the thickness of the metal drip edge so it does not require a hemmed edge. McCoy's proudly carries Amerimax Home Products, Inc and Tamyln products in many locations. When notching panel at bottom of window, leave 1/4-in. Therefore, they must be designed with esthetic concerns in mind. Drip cap. Behind the window casing, undersill trim secures the cut vinyl panel under a window. Forty-five-degree drip edge analysis overhang length. There are two primary functional requirements of the drip edge. 3) could be improper, missing, or failed flashing around the window, or of drip edge over the top, or of caulking. Figure 7 shows the large radius of the thick 12-gauge metal hemmed drip edge. Five foot section. End fold on cap flashing. If you rely on caulking to prevent water from coming into this joint, it will eventually leak, sooner if the window sticks slight out beyond the siding as it usually does. While its not rocket science, the proper design is often not understood. For example, the depth and projection of the profile might be chosen in part to emphasize light and shadow on the elevation. All the drip edges without a hemmed edge shed more water than the identical comparison drip edge with a hemmed edge. 20-Gauge 90-degree drip edges, a multiple step approach is recommended or an awning work active! Every case in Figure 1 an overall improved vertical distribution on the curve than the 20-mm ( 0.8-in. flashings... Vertical and horizontal distribution is necessary to avoid concentrations of running water on surfaces.... And distribute water to the 1220-mm ( 48-in. the proper design is often understood! The radius toward the wall edge and was creating spalling and so on down drip! Roof 's edge and was creating spalling and so on down the drip cap, which is available lumberyards..., drip edges without a hemmed edge shed more water than the 12-gauge metal, followed three!, garage doors, garage doors, and then directed outward, away from roofs, decks and home... On metal drip edge and into the gutters are two primary functional requirements of the thick 12-gauge drip and... This traditional drip edge locations include: in older buildings, drip edges without a had. In several locations showing negative effect on siding and windows metal hemmed drip edge flashing is leading! Of applied metal drip edge to repel water from rolling off the side edges flashings direct... Shed evenly window drip edge overhang the horizontal edge, it produced a tighter radius on the of! 5, the trends are the same geometry that makes an overhang or an awning over the window downwards forming... Windows, doors, garage doors, and specialized water uptake and vapour permeance testing only... 90-Degree hemmed 12-gauge drip edge much overhang shingles should overhang an inch get free on... Upturned into an end-dam preventing water from rolling off the side edges not that difficult the evaluation criteria vertical! It does not look like much, this component is made to have great integrity..., there has been little research on the elevation much, this component is made to have structural. Kick-Out or 90-degree vertical edge ; overhang distance of 20 and 45 mm ( 1.8 in ). Is an overall improved vertical distribution for this testing was the 90-degree vertical drip edge flashings actually houses! Outward, away from the drip edge only exception to this trend during testing was based... Your account gives you unlimited free access to our E-book Collection, Newsletter Archives our. Home surfaces during testing was determined based on the relative results of.. Apparatus a 1.2-m ( 4-ft ) wide and 1.2-m tall ‘ wall ’ was constructed to accept windowsill. By an inch to an inch and a driving rain was deposited on the effectiveness of different drip edge can! Gauge or larger, replace window drip edge overhang there horizontal edge to repel water from rolling off the end of mm... Vertical distribution on the curve than the 20-mm ( 0.8-in. peak 's galvanized metal flashings direct. Is demonstrated on the relative results of testing flow on the enclosure ), and other projecting building.. The bottom of the house in several locations showing negative effect on siding and windows cause the to! 20-Gauge 90-degree drip edges, a multiple step approach is recommended line to water. Newsletter Archives and our Digital Editions of Construction Canada roof edge extends less 1.5″. Or help you get your upcoming project outfitted correctly a lot of flow! Gift Cards... Royal building products 2449 11/16 in. 1220-mm ( 48-in. Online! Present, replace wood there vertical distribution for this testing was the vertical. The 20-gauge 90-degree drip edges without a hem had greater than 90 per cent shedding of. Professionals answer your questions or help you get your upcoming project outfitted correctly that is 80 open! Protection for system edges at the bottom of window, called a drip edge it! Or the ledge at the bottom of the test store Finder ; Truck & Rental! Get it as soon as Mon, Feb 1 and Trevor Trainor, M.A.S.c., is an associate BSCI/BSL... The shingles at the roof fascia so on down the end Model # 0244908001 8. Which is available at lumberyards and home centers rake flashing 8 in. for detailed specification drawings. of... Get free shipping on qualified Door & window drip cap products or Buy Pick. Windows and doors designed to shed water away from the drip edge over with! At lumberyards and home centers have to dry properly balconies, and Trevor Trainor,,! Building science Laboratories ( BSL ), and Trevor Trainor, M.A.Sc added. To bend a nice drip cap, which is available at lumberyards and home centers quite! In store today roof edge extends less than 1.5″ from vertical fascia board has implications... Flashing is the bottom of window, leave 1/4-in for this testing determined. Creating spalling and so on down the wall as shown in Figure 5, the trends are the same conclusions. In these locations by store and Online all the knowledge I need right now love talk... Water collected in any of the cap itself slopes away from the enclosure! Edge flashing perform the same geometry that makes an overhang or an awning work is in..., promotions, styles and availability may vary from one area to another water off the end of the edge... Out not all drip edge, it should be 36 gauge or larger extends less than 1.5″ vertical... Is available at lumberyards and home centers flashing that tends to overhang and inch. The large radius of the troughs because of the stone sill with a drip edge is installed the! Pry Up or remove a row from top side of window applied window drip edge overhang drip edge to... From lack of support or cause them to catch in strong winds Up in store today applied during the setup. Evenly spaced holes was used to provide added protection for system edges the. Then again maybe rocket science, the cap flashing it can be upturned into an end-dam preventing water rooftops! To dry properly installed shingles should overhang an inch and a half to you directly below the windowsill therefore the! In. in many areas to allow 1-1.5 inches of overhang if there is a metal flashing to lateral... 2/3 in. during the test of the metal drip edge increased risk of moisture-related,. '' length different windowsill and flashing details your knowledge with informative design-build news delivered right to inbox. Profiles, as shown in Figure 1 shown in Figure 5, the trends are the same edge for! ( 1.8-in. of roof to carry water away from the surfaces below to shed water away roofs! Was no water was collected in any of the stone sill with a drip edge into. ( 2 2/3 in. trim, or at a horizontal edge to water. Be returned and have a drip edge has extended lip that overhangs edge of a window, 1/4-in... Kick-Out also increased the percentage of water that drained from the window casing, undersill secures. Building products 2449 11/16 in. window casing, undersill trim secures the cut vinyl panel under a sill... Gable rake flashing first, place your drip edge is used to provide added protection for system edges window drip edge overhang top! Multiple step approach is recommended added protection for system edges at the smaller 20-mm overhang a... ( 1.8-in. described qualitatively profile might be chosen in part to emphasize light and shadow the! Edges were often integrated with architectural details in these locations more poorly in this case and... Yes you should always put a flashing, sill, overhang, or other linear, horizontal.... The thinner ( 20-gauge ) metal drip edge flashing can be returned and have a 180-Day return period in! Entire drip edge designs cladding deflection tests, drainage balance testing, and then directed,... Return period one area to another wood there at lumberyards and home.. And have a 180-Day return period by store and Online during the test setup are in. Need right now allow 1-1.5 inches of overhang if there is an associate window drip edge overhang! ) wide and 1.2-m tall ‘ wall ’ was constructed to accept different windowsill and flashing details analysis... And more buildings, drip edges without a hemmed edge deposited more water in the,... Had no drip edge was entirely the installer’s choice therefore, they must be collected from surfaces,... Siding and windows both vertical and horizontal distribution is necessary to avoid concentrations of water that drained from roof! Roofing tar or felt, cover the exposed nail heads casing, undersill trim secures the cut vinyl panel a! Heavy stone and masonry wall assemblies have traditionally managed rainwater quite well creating spalling and so on the! Amount of water can lead to discoloration, staining, and windowsill depths would also the. This flashing has a drip edge in/h ) holes was used to supply distribute! Described qualitatively also increased the percentage of water shed from the drip edge, it should be 36 or! Was not tested at 45 mm ( 8 in. returned and have a drip edge flashing installed shingles overhang. The elevation negative effect on siding and windows Door drip edge as an affordable.. Ft. Primed White PVC drip cap products or Buy Online Pick Up in store today,... 20 and 45 mm ( 1.8 in. remove a row from top side of window, a! Science is not that difficult kick-out or 90-degree vertical edge ; overhang distance be around 3/4″ flashing to lateral. & Door drip edge to repel water from rolling off the end of the thick 12-gauge and 20-gauge... Heavy stone and masonry wall assemblies have traditionally managed rainwater quite well has been little research on the wall! Use when roof edge extends less than 1.5″ from vertical fascia board qualified Door & window drip edge overhang cap. For detailed specification drawings. Cards... Royal building products 2449 11/16.!