One of the most troublesome areas of the roof is the Eave to Rake Wall Flashing intersection. However, the problems in this area can be greatly reduced if some guidelines are followed. Before installing any roofing material, make sure that others before you have correctly completed their job with the Fascia Trim Board and Roof Decking intersection.
This intersection should look as sketched above. It can be equal to the thickness of the Exterior Wall Covering or slightly less but never thicker than the Exterior Wall Covering. This is too short for even the minimum roof flashing height of 4" up the wall that is required by some roofing materials. See Eave Roofing Material Installation web page.
Shown is a two ply Underlayment installation which means that it is applied shingle fashion. Example: a 36" wide underlayment is lapped 19" to obtain a true 2 ply installation. By the way, the Underlayment can be installed anytime, even after the placement of the Through the Wall Z Bar Flashing. It also serves as the counter flashing of the roof to wall flashing that will extend into the gutter. Setting it down directly on the Through the Wall Z Bar will block the weep holes.
Now any moisture that gets in behind the Exterior Wall Covering will drain down the wall House Wrap onto the Through the Wall Z Bar Flashing and onto the roof surface once the roof flashing and roofing material is installed.
Eave to Rake Wall Flashing
The Roofing Material and Roof Flashing can be installed at any time with ease. If the roof ever needs to be replaced, the new Underlayment and Roof Flashing can easily be installed without disturbing the Exterior Wall Covering. Check back here for updates and new content. Last Revision February 27, This closeup sketch shows details of the intersection of the Eave to Rake Wall.InspectAPedia tolerates no conflicts of interest.
We have no relationship with advertisers, products, or services discussed at this website. This article series discusses roofing installation, including roof sheathing, roof underlayment, roof coverings such as shingles, slates or membranes, and roof flashing. 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.
Without this detail water leaving the roof edge wants to run down building fascias, soffits, and walls, sometimes even entering and damaging the structure.
The drip edge also gives us a nice straight edge with which to align roof shingles, slates or other roofing material. Drip edge varies in dimensions but typically the flange that nails to the roof surface is about 2. The sketch above illustrates the end-profile of roof drip edge flashing and shows its placement on the roof.
Usually you won't see much of drip edge as it's under the roof shingles, under the underlayment, and behind the roof gutter. 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.
The brown drip edge is properly installed and is doing its job.
Guide to Drip Edges for Shingle Roofs
Most of the roof runoff is going off the roof not down the fascia board. Our illustration above shows proper placement of the roof drip edge atop the roof sheathing - before installation of roofing felt or ice and water shield and spaced a bit away from the fascia board to improve its drainage. Some roofing manufacturers such as IKO suggest installing a furring strip to make sure that the drip edge is spaced well out from the fascia.
If using a Type C drip edge, you can install a furring strip to increase its performance. IKO In the sketch above the furring strip is shown in blue. The gutter not shown will be secured to the fascia board yellow with the gutter high-end up tight against the under-side of the furring strip.How to Install Rake/Gable Trim: ABC SL-16® Metal Roofing System
Above my photo below at left illustrates use of a site-built "drip edge" nailed tight against the fascia board, leaving a gap that in turn sends roof runoff behind the gutter. Below see the stains on the aluminum-wrapped fascia board confirming that a lot of water is being sent behind rather than into the gutter on this roof.
There was no way that the gutter installe was going to get the upper edge of the gutter behind the drip edge. Some rain runoff, by capillary action runs up under the shingle drip edge and down the fascia behind the gutter. Our photo illustrates several details of roof drip edge, eaves flashing, and gable end flashing at an asphalt-shingle re-roof job we documented in Dutchess County, New York. From left to right:. Below we illustrate an effort to add a second drip edge white below the original roof drip edge brown to correct a problem with water running behind the gutter rather than into-it.
If the gutter is not secured snugly against the fascia or if the gutter was installed atop rather than under the drip edge you'll get this problem. On roofs with no eaves overhang or soffit, proper installation of drip edge proud of the fascia board at the wall top is very important to avoid water damage to the building walls below.
Look at the worn and lost wood siding shingles pointed-to by our client who is indicating damage and missing shingles on the wall below the roof edge.
The presence of more wear on siding shingles at the top of the wall than lower-down confirms a history of roof runoff streaming down the building walls.Drip edge and rake edge are not required by Alberta building code nor by manufacturer specifications on roofing systems; however, virtually every responsible professional roofer in the Alberta roofing marketplace will recommend having it installed. Drip edge and rake edge are the first parts of the roof system to be installed.
Drip edge goes along your eaves trough areas and rake edge goes along your gable ends. They both look very similar and are often not differentiated in name by some suppliers and simply called drip edge. There is a slight difference in reality though, as the angle of the two metal component act in a specific way to shed water from the roof deck.
Here, at The Roof Hospital, we always recommend for drip edge and rake edge to be installed on every roof system — no matter what. The function of this component in your roof system is pretty straight forward; it protects your roof deck from exposure to weather. In your eaves troughs, snow and ice build up in colder weather and can work backwards, up under your shingles, soaking into the wood framing, which can eventually lead to wood rot and deterioration. On your gable ends, driving winds can force moisture sideways under your shingles, which creates a similar end result; rotting wood.
Installing an appropriate drip edge often saves hundreds and sometimes even thousands of dollars when your roof system needs to be replaced. In conclusion; drip edge and rake edge is a piece of metal which covers the perimeter of your roof deck plywood to protect it from being exposed to weather, such as snow, ice and wind driven rain.
It is low in cost, high in effectiveness and overall recommended on all Alberta, and particularly Calgary, based roofing systems. Your email address will not be published. Skip to content Roof Hospital Exteriors. Let's Redefine Your Look. We Don't Just Do Roofs.
Exterior Envelope Specialists. Leave a Reply Cancel reply Your email address will not be published.Also called drip edge flashing or D-metal, they serve a vital function by directing water away from the fascia and into the gutter. Without a drip edge, water may end up beneath the shingles and may cause damage to various parts of the home. Though your home may not have originally had a drip edge installed, drip edges are now required by most building codes across North America to protect homes from damage.
Drip edges are made of various plastics and metals, which are both acceptable under most building codes so long as the metals are corrosion-resistant or galvanized. While plastic, vinyl and fiberglass drip edges may also be available in your area, these materials are best suited for use in nonroofing applications, such as above doors and windows.
There are three basic profiles of drip edge flashing, but each goes by more than one name, which can be confusing. Roof drip edges are generally sold in The length of the overhang itself commonly ranges from 2 to 5 inches.
After your roof deck has been prepared, and before you install underlayment, you need to install drip edges at the eaves. You install drip edges on the rakes after you install the underlayment. Plus, this step-by-step guide to drip edge installation will also explain how to cut drip edges for corners and peaks. You should always check with your local building code to see if there are any extra rules you are required to follow during drip edge installation. What if you need to replace the drip edge on an existing roof or install a drip edge on an existing roof for the first time?
Just as with installing drip edges on new roofs, you should check with your local building codes to see if there are special rules you have to follow about drip edge replacement. In years past, many building codes did not require drip edges; but the roofing community realized that these relatively inexpensive products make a big difference in the performance of the roof. All rights reserved. The information on this website is subject to change without notice.
IKO assumes no responsibility for errors that may appear on this website. IKO strives to accurately reproduce the screen images of the shingle swatches and house photos shown. However, due to manufacturing variances, the limitations of your monitor resolution and the variation in natural exterior lighting, actual colors may vary from the images you see.
To ensure complete satisfaction you should make final color selections from several full size shingles and view a sample of the product installed on a home. Please refer to our Legal Notices for U. Location set to view all.
Show All Products. Guide to Drip Edges for Shingle Roofs. Drip edges have two key purposes: Direct water away from fascia: Due to cohesion, surface tension and other forces, water droplets tend to stick to one another and to the surfaces they are on, albeit slightly.
A drip edge is designed to take advantage of those forces and, along with gravity, direct water into the gutter.
If the home has no gutter, the drip edge will prevent the water from running down the fascia and onto or into the soffit cavity. However, without the drip edge, the water sticks to shingles, potentially working its way under the shingles to cause a leak. For example, water may cling to the fascia, which may cause rot, or, in severe conditions, a leak into the home. Protect from wind-driven rain: When conditions are serious, the wind pushes water around on a roof. However, on the edges, the drip edge must compete with the wind.
Wind can easily push the water upwards before gravity pulls the water down. The drip edge needs to hang significantly off the edge of the roof and has two to four inches of lower flange to combat this. Drip Edge Material Types Drip edges are made of various plastics and metals, which are both acceptable under most building codes so long as the metals are corrosion-resistant or galvanized.
Drip Edge and Rake Edge – Roofing Calgary
Galvanized steel: Drip edges are designed to be in contact with water; so, if they are made of steel, they need to be galvanized to prevent rust.One common method is to lay the edge metal under the eaves membrane, and over the rake membrane. The layering uses gravity to direct water out of the assembly. Regardless of how you do it, make sure that the eaves membrane extends at least 2 feet inside the outer face of the wall, It probably means a second course of edge membrane. Two Ways to Flash Roof Edges.
Step by step: Overlap seams about 3 inches, depending on what the manufacturer specifies.
Install drip edge metal to the eaves beginning at the back of the house, working toward the most visible section of roof, to avoid gaps that catch the eye. Work the edge metal up the rake from the bottom. The upper pieces should overlap the lower ones.
Visible gaps between the flashing are less important than the water-injection system that would result from slipping upper pieces under lower ones. The bottom of the rake metal should extend past the eave flashing. Sweating the details at the edges will keep ice dams and windblown rain out of your roof. Related Content Image. Fall Protection Guide. Editor's Picks Image.There is a primary difference between the application of the perimeter drip edge metal at the rake edge and at the downslope of the eave edge.
At the rake edge, the perimeter drip edge metal is applied over the underlayment with the appropriate fasteners secured every eight 8 to ten 10 inches on center.
At the downslope eave edge, the perimeter drip edge metal is applied under the underlayment with the appropriate fasteners secured every eight 8 to ten 10 inches on center. The eave flashing is bent and trimmed in at the corner of the rake edge metal to form a closed end. The drip edge metal should be fabricated from a minimum 26 gauge galvanized metal. The drip edge metal should be of sufficient length at the horizontal point over the underlayment to prohibit the water from infiltrating the system — approximately two 2 to three 3 inches.
The drip edge metal shall extend over the fascia board at the vertical point of each location. I want to hear from you. Tell me how we can improve. This website requires certain cookies to work and uses other cookies to help you have the best experience.
Learn More This website requires certain cookies to work and uses other cookies to help you have the best experience. Building Enclosure logo. Related Articles Roofing Code: Section Report Abusive Comment.
Building Enclosure. Winter The Winter issue of Building Enclosure including in-depth looks at high-performance air barriers, polyiso insulation, and more educational content about the building envelope.Two similar types of flashing are available: one for the bottom edge of the roof and another for the sloped sides.
While one type works well for new-roof installation, the other type is better for existing roofs. Flashing directs water away from penetrations in the exterior of the house. Gutter apron helps seal the bottom edge of the roof and diverts water to the guttering. The best time to install gutter apron is before putting down roofing felt.
Gutter apron attaches along the bottom roof edge with galvanized roofing nails. If the roof is already on but the roofer skipped the flashing, Type B gutter apron, which has a narrower top fold, inserts beneath the lowest row of shingles.
This requires prying up the edge of the bottom row shingles, installing the flashing and renailing the shingle row. Sealing the side of the roof is similar to sealing the bottom. Rake flashing also comes in Type A, for use on new roofs, and should be installed before the felt paper. Type B slips under existing side shingles after prying them up. If the shingles are stiff, add roofing adhesive to help them seal back down before renailing. Rake edge installs from the bottom up and overlaps the gutter apron.
Drip edge flashings come in white and a couple of shades of brown.
Roofing Details: Drip Edge at Rake and Eave
While rake flashing closely resembles the gutter apron in both types, they are not interchangeable. Gutter apron flashing requires a wide edge to direct water into the guttering and away from the fascia. On the rake of the roof, however, a smaller drip edge is preferable for creating a clean roofline.
Glenda Taylor is a contractor and a full-time writer specializing in construction writing. She also enjoys writing business and finance, food and drink and pet-related articles. Her education includes marketing and a bachelor's degree in journalism from the University of Kansas. Skip to main content. Flashing Flashing directs water away from penetrations in the exterior of the house. Gutter Apron Gutter apron helps seal the bottom edge of the roof and diverts water to the guttering.
Roof Rake Sealing the side of the roof is similar to sealing the bottom. Considerations Drip edge flashings come in white and a couple of shades of brown. References 1 Hometime: Roofing.
About the Author Glenda Taylor is a contractor and a full-time writer specializing in construction writing. Customer Service Newsroom Contacts.