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Skylight or smoke-hatch flashing works when the unit, curb, roof covering, and flashing form one coordinated water-management assembly. “Integral flashing” describes flashing built into or supplied with the unit; it does not by itself establish that the curb-to-roof connection is complete. The right detail depends on whether the roof is a low-slope membrane or a shingle assembly, the unit’s geometry, and the applicable product and roofing-system instructions.
The reference details below show how those pieces can come together, but they are not universal installation specifications. In particular, dimensions and fastener spacings apply only to the cited examples unless the project’s approved details say otherwise.
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What does integral flashing mean on a skylight or smoke hatch?
Integral flashing is a flashing feature incorporated into, attached to, or supplied as part of the skylight or smoke-hatch assembly. Depending on the product, it may include a flange or a vertical counterflashing element. The term alone does not tell you how the unit connects to the curb, how the roof membrane or shingles are integrated, or whether separate sheet-metal counterflashing is still needed. Those questions depend on the actual product configuration and the roof system.
It helps to separate three parts of the detail:
- The unit and curb: The skylight or hatch is mounted over an opening, commonly on a curb. The curb raises the unit above the roof surface and provides a vertical face around which roofing and flashing can be installed.
- Base flashing: Roofing membrane or other compatible flashing material turns up from the roof surface and covers the curb. Its job is to maintain continuity between the roof covering and the curb.
- Counterflashing: A separate metal or product-integrated layer covers or protects the top edge of the base flashing. It helps keep water from getting behind that flashing. A unit’s integral counterflashing may serve this role, but the detail must show that it is adequate for the project.
These functions overlap in some product designs, but they are not interchangeable by name. A flange at the base of a unit, an upstand on a curb, base flashing, and counterflashing can each be distinct features. Confirm which components are present rather than assuming that “integral flashing” means no other flashing is required.
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How does a low-slope membrane roof detail work?
On a low-slope roof, the central task is to carry the membrane system up and around the curb while protecting the upper edge of that flashing. The Western States Roofing Contractors Association (WSRCA) reference recommends curbs that can be roofed, base-flashed, and counterflashed with sheet metal rather than relying on embedded metal flashing. Its detail is a reference, not a universal specification; WSRCA says profiles, components, and sequencing can vary with the roofing system, climate, and regional practice.
A 2022 Polyglass low-slope installation guide illustrates the layers in one self-adhered membrane assembly. Below and around a factory- or field-fabricated curb, the drawing identifies a structural deck, insulation, optional coverboard, a cant, interply and base membranes, and a cap sheet. At the curb, it identifies interply reinforcement base flashing and cap-sheet base flashing. It separately labels sheet-metal counterflashing as “by others.” That last notation illustrates why the scope of work matters: a roofing contractor’s membrane detail may not include every metal component needed to finish the penetration.
In practical terms, the assembly should be reviewed as a connected sequence: the curb is secured to the supporting structure as specified for the project; the roof layers are installed to the curb; flashing layers cover the curb and connect to the field membrane; and counterflashing protects the upper flashing edge. The specific attachment, material compatibility, and sequence must come from the unit manufacturer and the approved roof-system detail. Do not infer them from a drawing for a different product or membrane.
The Polyglass drawing gives example fastener spacings of a maximum 18 inches on center, or as required by the skylight or hatch manufacturer, for frame fasteners, and approximately 8 inches on center through flashing membrane. Those figures belong to the guide’s depicted assembly. They are not general requirements for every curb, membrane, or unit; the manufacturer’s requirements and project documents control.
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WSRCA’s 2017 reference also recommends a minimum three-inch horizontal flange. It describes its dimensions as approximate recommendations and minimums that allow for field tolerances, and cautions that profiles and configurations vary. Treat that dimension as an attributed reference point to check against the actual unit and roof-system design—not as a code requirement or a substitute for current product instructions.
How is flashing different on a shingle roof?
A shingle roof uses a water-shedding sequence rather than the low-slope membrane turn-up shown in the membrane details. The flashing must be layered with the shingles and underlayment so water moves outward and down the roof, not behind the opening.
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Clear out junk files and repair common Windows errorsFree Scan →Scan for outdated or missing drivers - takes under a minuteDriver Scan →Repair Windows errors before they cause bigger problemsFix Now →The Pacific Northwest National Laboratory Building America Solution Center guide describes a residential skylight approach that works from the bottom upward. It calls for underlayment and self-adhered membrane flashing at the sill and sides, with membrane at the head integrated directly to the wood deck. Roof underlayment and shingles are then installed, with sill flashing, step flashing woven into the side shingle courses, and head flashing. The skylight is fastened to its curb according to the manufacturer’s instructions.
This sequence is specific to a shingle-roof context. Do not transfer it wholesale to a low-slope membrane roof, or assume that a membrane curb detail is appropriate beneath shingles. The covering type determines how the opening is tied into the surrounding water-shedding layers.
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Which roof detail applies to my project?
Start with the roof covering and the unit’s installation instructions. The available references show two different approaches; they do not establish a universally best unit or a single detail for all roofs.
| Project context | Water-management approach | Key coordination question |
|---|---|---|
| Low-slope membrane roof | Carry compatible roof and base-flashing membrane layers up and around the curb; protect the top edge with specified counterflashing. | Does the unit include counterflashing, or must the project provide separate sheet metal? |
| Shingle roof | Integrate underlayment, self-adhered membrane, and sill, step, and head flashing with the shingle courses in a water-shedding sequence. | Does the flashing kit and installation sequence match the roof and unit manufacturer instructions? |
A detail that looks similar at the curb can still fail to match the roof assembly if its materials or sequencing differ. Confirm the roof-system type, the curb and unit configuration, and the approved detail before work begins.
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What should the roofing contractor and unit supplier coordinate?
Set responsibility for every component before the opening is closed in. WSRCA notes that some components shown in its detail may not be supplied by the roofing contractor. Polyglass’s drawing makes the same coordination issue concrete by identifying sheet-metal counterflashing as work “by others.” Avoid relying on an assumption that one trade will furnish a part because it appears in another trade’s drawing.
- Identify the roof system and opening. Record whether the roof is low-slope membrane or shingles, and whether the unit is a skylight or smoke hatch. Confirm whether it is curb-mounted and whether the curb is factory- or field-fabricated.
- Get the exact unit detail. Check the selected unit’s current installation instructions and identify its flange, curb interface, integral counterflashing, and fastening requirements. Do not infer product geometry from a generic reference drawing.
- Map the roof layers to the curb. The roofing-system detail should identify the membrane or shingle-related layers, flashing materials, and how they connect at the curb. For a membrane assembly, confirm which base-flashing plies and cap layer are specified. For shingles, confirm how sill, side, and head flashing integrate with the courses.
- Assign supply and installation scope. Name who furnishes and installs the curb, membrane or other base flashing, sheet-metal counterflashing, and any integral or separate insert. Include transitions and corner treatment where the project detail calls for them.
- Resolve dimensions and fastening from project documents. Compare any reference-detail dimensions and spacings with the actual unit, roof-system instructions, approved drawings, and locally applicable requirements. A value in a typical detail is not automatically applicable to another assembly.
- Review safety and approvals separately. Skylight and smoke-hatch details can have fall-protection, wind, and other project-specific considerations. Verify current locally adopted codes and the product approvals for the actual project; a flashing detail alone does not establish structural, fire, or smoke-control compliance.
What do the dimensional recommendations mean?
The WSRCA reference recommends a three-inch minimum horizontal flange and expressly qualifies its dimensions as approximate recommendations, allowing for field tolerances. It also says profiles, component configuration, and installation sequencing may vary by roof system, climate, and regional practice. That makes the dimension useful for discussing fit and coordination, but not a universal minimum mandated by code.
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A separate Contra Costa County project plan gives a project-specific example: it calls for a counterflashing insert when integral counterflashing is absent or is less than two inches at the vertical portion. That is a note on that project’s drawing, not a general threshold for all skylights or smoke hatches. The same plan addresses a TPO roof assembly and includes other project directions, such as curb-corner treatment, a high-side cricket where required, and fall-protection and high-wind criteria. Those directions should not be generalized beyond that plan.
Always distinguish between a reference recommendation, a manufacturer instruction, a project drawing, and a locally adopted code requirement. They answer different questions and may not have the same authority for the work in front of you.
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Sometimes the product design may incorporate a counterflashing function, but the phrase “integral flashing” does not prove that it replaces every separate flashing component. Check the unit’s actual vertical geometry and the roof-system detail, including how base flashing terminates and how that termination is protected.
The WSRCA recommendation favors curbs that can be roofed, base-flashed, and counterflashed with sheet metal. The Polyglass example identifies separate sheet-metal counterflashing supplied by others. Conversely, the Contra Costa County plan’s insert note shows one project addressing absent or short integral counterflashing with an added component. Together, these examples reinforce the need to verify the actual interface rather than assume one solution applies to all products.
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How can climate affect the detail?
Climate can influence material and color choices, but the recommendation must be kept in context. WSRCA suggests a white or other light-colored thermoplastic single-ply membrane and flashing plies for sunny, hot, or high-altitude projects in winter-heating climates, with the aim of reducing heat gain and thermal aging. This is guidance for the conditions it describes, not a universal rule that every roof should use a light-colored membrane.
Climate is also one reason the WSRCA reference warns that profiles, components, and sequencing may vary. Apply the manufacturer’s instructions and project-specific roof-system requirements for the actual location and assembly.
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- Treating “integral” as “complete.” A product feature may not replace base flashing or separate counterflashing. Identify each layer and its termination on the detail.
- Mixing roof-system sequences. Shingle step flashing and membrane base flashing solve the interface differently. Use the detail for the roof covering actually installed.
- Leaving “by others” undefined. If counterflashing, curb fabrication, or a flashing insert is outside one contractor’s scope, assign a responsible party and confirm when it will be installed.
- Copying a reference dimension as a project rule. The three-inch flange recommendation and the county plan’s two-inch insert trigger have specific source contexts. Neither is a universal code threshold.
- Assuming a flashing drawing covers all approvals. Weatherproofing details do not by themselves establish structural adequacy, wind approval, fall protection, fire compliance, or smoke-control performance. Verify those requirements separately for the project.
The practical test for a detail is whether the documents show a continuous, compatible route for managing water from the roof surface, around the curb, and past the upper edge of the flashing—and whether every component in that route has an assigned supplier and installer.
Frequently Asked Questions
Does a smoke hatch use the same flashing detail as a skylight?
It can share the same basic curb-and-roof coordination problem, but the product geometry, approvals, and installation instructions may differ. Confirm the selected smoke hatch’s own requirements; a skylight detail should not be assumed to establish smoke-control or other hatch compliance.
What does “by others” mean on a roof flashing drawing?
It means the component is not included in the scope identified by that drawing and must be provided by another project party. The contract documents should identify who supplies and installs it so the interface is not left unfinished.
Can a roof curb be field-fabricated?
The Polyglass example allows a factory- or field-fabricated curb in its depicted assembly. Whether field fabrication is appropriate on another project depends on the approved roof and unit details, not that example alone.
Does adding a cricket solve every leak at a skylight curb?
No. A cricket is only one possible part of a project-specific water-management detail, and the cited county plan calls for a high-side cricket where required in that project. The curb flashing, membrane continuity, corners, and counterflashing still need to match the actual assembly.
