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Flashing terminations secure the upper edge of a roof membrane where it turns up a wall, curb, or other vertical surface. The two principal details are a surface-mounted termination bar and a recessed reglet with counterflashing. Neither is universally correct: the membrane manufacturer’s current instructions control the substrate, attachment, height, fasteners, sealant, and warranty requirements.
The 2011 Building Enclosure detail remains useful as an overview, but it is not a construction specification. Current system documents can require different dimensions and components. For example, IB Roof Systems’ November 2022 drawing depicts base flashing 8 inches above the roof and bar fasteners at 6 inches on center, while GenFlex’s April 2026 guide provides its own system-specific termination requirements.
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A flashing termination is the point where the top edge of a roof membrane or flashing is secured to a wall and protected from water entry. The detail must hold the membrane in place, keep water from tracking behind it, and accommodate the wall’s construction and movement. A termination bar exposes the attachment at the wall face; a reglet places the receiver in a cut or formed recess and uses counterflashing to cover the membrane edge.
The visible shape is only one part of the assembly. Membrane compatibility, a sound substrate, approved fasteners, washers, sealant, counterflashing, and the transition from roof to wall all have to work together. A bar or bead of caulk cannot correct a weak wall, an incompatible membrane, or an attachment pattern that the roofing system does not approve.
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Building Enclosure’s 2011 overview explains the basic choices and notes that existing conditions may limit what can be installed. Its detail image is credited to Kemper System. Treat that article as background, then obtain the current detail for the exact roofing product.
Which termination method should you use?
Choose the method that the roofing manufacturer permits for the membrane and that can be anchored to the actual wall assembly. Surface bars are often practical where the wall face is accessible and sound; reglets and counterflashing provide a more concealed edge but require suitable cutting or forming and careful water management.
| Method | How it works | Advantages | Constraints to verify |
|---|---|---|---|
| Surface-mounted termination bar | A metal bar clamps the membrane or flashing to the vertical wall; fasteners pass through the bar into the approved substrate. | Usually straightforward to inspect and retrofit; the attachment is visible and replaceable. | Needs a sound substrate, approved fasteners and washers, compatible sealant, and the manufacturer’s spacing and securement schedule. Exposed sealant may require maintenance. |
| Reglet with counterflashing | A saw-cut or formed recess receives a receiver or counterflashing that covers the membrane’s upper edge. | Can shield the membrane edge and produce a more integrated wall finish; some two-piece systems allow the counterflashing to be removed for access. | Requires adequate wall thickness and a properly sealed, anchored receiver. Cutting an existing wall can create dust, structural, waterproofing, and finish-repair issues. |
| Through-wall or other remedial detail | The flashing is integrated through the wall or adapted to unusual existing construction. | May solve conditions where a face-mounted bar or ordinary reglet cannot be installed. | Highly dependent on the existing assembly and design; use only a documented, approved detail rather than improvising a penetration. |
In IIBEC’s detailing guidance, a two-piece receiver and counterflashing arrangement separates wall anchorage from the removable counterflashing segment. That separation can make future inspection or replacement easier, but the receiver, anchors, laps, and sealant still have to be detailed for the particular wall and roof system.
How high should a wall flashing terminate?
There is no single height that can be taken from the sources here as a universal code rule. The finished roof, adjacent paving or wear surfaces, expected water level, wall geometry, and the selected product guide all matter.
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- Building Enclosure (2011): Raise the membrane flashing well above the “usual 6-inch minimum” or above the anticipated water line created by finished wear surfaces. This is guidance in that article, not a universal specification.
- IB Roof Systems, revision 11.2022: Its standard base-flashing drawing shows the flashing 8 inches above the roof. That dimension belongs to the depicted IB detail.
- GenFlex, April 10, 2026: The EZ TPO Design Guide sets requirements for its own curbs and terminations, including provisions for situations in which an ordinary minimum cannot be achieved.
Measure from the finished roof or the reference surface identified in the detail, not from an arbitrary structural line. Check doors, parapets, pavers, ballast, snow or debris accumulation, and drainage paths that could raise water against the wall. If a low condition cannot be changed, obtain the manufacturer’s accepted alternate detail before work begins.
What substrate and securement does the detail require?
The vertical receiving surface must be rigid, sound, and watertight enough to carry the attachment without movement or pull-out. GenFlex states: Termination must be made directly to a sound, watertight, rigid, vertical substrate.
That sentence is a GenFlex product instruction, not a general rule issued by a standards body, but it illustrates why a finish coat, deteriorated masonry, wet insulation, or loose sheathing cannot simply be treated as an acceptable anchor point.
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Confirm the wall type, thickness, backing, moisture condition, and presence of concealed utilities before drilling or cutting. The selected fastener must be approved for that substrate and the membrane system. Do not substitute generic screws because their diameter or length appears similar; pull-out, corrosion, washer geometry, and embedment can change the performance of the assembly.
The IB Roof Systems termination drawing identifies an aluminum termination bar, approved fasteners with grommeted EPDM washers, approved sealant, and water-stop sealant. Its depicted bar detail places fasteners at 6 inches on center and directs installers to the IB specifications and securement table. Those components and spacing are not a generic prescription for another membrane.
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How do you detail or install a termination?
Before installation, have the current membrane detail, substrate information, dimensions, and approved accessory list available. A qualified roofing professional should resolve conflicts between the roof plan, wall drawings, and the manufacturer’s instructions before the membrane is covered.
- Identify the governing system. Record the membrane type, manufacturer, roof assembly, warranty requirements, and the exact wall or curb condition. Download the current detail rather than relying on a copied drawing from an older project.
- Survey the wall and water line. Locate the finished roof elevation, adjacent surfaces, drains, penetrations, joints, and any area where water, snow, or debris could collect. Mark the required termination height from the approved detail.
- Prepare a sound receiving surface. Remove loose coatings and repair deteriorated or wet materials as directed by the designer or manufacturer. Verify that the surface is vertical, rigid, and watertight where the attachment will land.
- Choose the attachment approach. Use a surface bar only where the system allows it and where approved fasteners can reach adequate backing. Use a reglet or receiver/counterflashing detail only where the wall can accept the recess and the cuts can be sealed and repaired. Escalate unusual conditions instead of mixing details.
- Install compatible membrane and accessories. Set the flashing, bar or receiver, washers, laps, corner pieces, and sealants exactly as shown. Keep the membrane clean and undamaged; do not trap wrinkles, debris, or incompatible sealant beneath the clamping line.
- Install fasteners to the specified pattern. Use the listed fastener type, corrosion protection, embedment, and spacing. For the IB drawing, 6 inches on center is the shown spacing; another system may require a different pattern or a securement table calculation.
- Seal transitions and terminations. Apply the specified water-stop or joint sealant at the locations shown, tool it so it contacts the intended surfaces, and maintain required laps and end dams. Sealant should not be used to hide an open joint, a loose bar, or an unsuitable substrate.
- Inspect before concealment. Check bar continuity, corner treatment, washer seating, fastener engagement, membrane height, counterflashing engagement, and sealant coverage. Photograph concealed work and retain product lot and installation records for the warranty file.
- Plan access for maintenance. Make removable counterflashing or exposed sealant accessible for inspection. Tell the owner which joints must be checked and what conditions require a roofing contractor.
How do reglets and termination bars behave in retrofit work?
Existing construction often determines the feasible option. A double-bladed saw cut can form a reglet in some masonry or concrete walls; a formed-in-place reglet may be possible in new work or compatible substrates. Both approaches require dust control, structural caution, a clean receiver, and a durable seal at the cut. A surface bar avoids cutting a continuous recess but may be difficult where the wall face is uneven, fragile, finished with a nonstructural veneer, or inaccessible.
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Through-wall flashing or another remedial solution may be appropriate where the existing wall contains a cavity, shelf angle, or other geometry that prevents a normal termination. Such work can affect interior finishes and drainage layers, so it should be designed as an assembly rather than treated as a larger bead of caulk. The historical DOE CAS Manual, Volume 5: Roofing is a reference for older roofing details only; it does not replace the current product guide or project specifications.
When comparing retrofit proposals, ask five questions: Is the membrane system compatible? Is the substrate and fastener path acceptable? Can the counterflashing be removed for future work? Does the geometry keep water below the termination? What sealants and joints will the owner have to maintain?
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What maintenance does a finished termination need?
Inspect the termination after major weather, roof work, façade work, and any event that could move the wall finish or membrane. Look for split or debonded sealant, open laps, loose or corroded fasteners, distorted bars, damaged washers, cracked counterflashing, and staining that indicates water behind the wall edge.
IB Roof Systems expressly notes periodic owner maintenance for sealants and caulking in its drawing. Maintenance is therefore part of the design, not evidence that a detail was installed incorrectly. Use the sealant manufacturer’s compatibility and replacement instructions, remove failed material without cutting the membrane, and have repairs reviewed against the roofing warranty requirements.
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What are the most common flashing-termination mistakes?
- Copying a generic height: Treating 6 inches or 8 inches as an all-project rule ignores the source, finished surfaces, and current system guide.
- Anchoring into the finish only: A bar attached to loose parging, thin veneer, wet insulation, or deteriorated sheathing cannot provide reliable securement.
- Mixing systems: Combining one manufacturer’s membrane with another manufacturer’s bar, washer, sealant, or spacing can void approval and create incompatibility.
- Using caulk as the attachment: Sealant is a joint and water-management component; it is not a substitute for mechanical securement where the detail requires a bar, receiver, or fasteners.
- Ignoring the water line: A termination below a paver, walkway, snow shelf, or debris path can be overtopped even when it meets a nominal dimension.
- Making the counterflashing inaccessible: A permanently buried or blocked counterflashing segment can turn a minor sealant repair into destructive work.
- Leaving no maintenance record: Owners need the product name, detail revision, sealant type, inspection interval, and warranty contact to maintain the edge correctly.
What should be included in the project specification?
Specify the membrane manufacturer and system, the governing detail revision, termination height reference, substrate requirements, bar or reglet type, fastener and washer approval, sealant and water-stop locations, corner and end conditions, counterflashing configuration, inspection hold points, and maintenance responsibility. Require the installer to submit a marked-up detail for unusual walls, low-height conditions, or retrofit constraints.
Finally, state that the manufacturer’s current written instructions govern where they differ from a generic drawing. Building Enclosure’s article summarizes the principle well: it recommends following termination designs in accordance with the material manufacturer’s recommendations. That is the safest way to use an older detail without treating it as a universal specification.
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Frequently Asked Questions
Is a 6-inch flashing height required by code everywhere?
Not on the evidence cited here. The 6-inch figure is described by Building Enclosure as a usual minimum in its 2011 article, while an IB drawing shows 8 inches for its own detail; verify the adopted code and the current roofing-system instructions for the project jurisdiction.
Can a termination bar be installed over exterior insulation?
Only if the approved system detail provides a structural attachment path through the insulation to suitable backing. A bar fastened only to compressible insulation or a decorative finish does not meet the substrate requirement by itself.
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A removable segment can provide useful access to the wall anchorage and membrane edge, as described in IIBEC’s two-piece receiver concept. It still needs positive anchorage, laps, and sealant appropriate to the exposure, and removal should not damage the membrane.
What documents should an owner keep after flashing work?
Keep the approved shop detail, product and accessory names, detail revision, fastener and sealant information, photographs before concealment, warranty conditions, and the recommended inspection and recaulk interval. These records help distinguish maintenance from a system-repair claim.
