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EJOT’s sinusoidal-profile suction cup extends its VACUtest fastener seal-testing kit to 13.5-3 sinusoidal roofing and cladding sheets. An installer places the cup over an installed self-drilling screw head, uses the pump to create a vacuum, then reads the gauge to assess whether the washer compression is sufficiently airtight. The development was reported in July 2023, so it is a product update—not a new 2026 launch. It is a way to check an installed fastener seal; it does not by itself establish code compliance or prove that a roof is weatherproof.
What is EJOT’s sinusoidal-sheet seal-testing solution?
It is a shaped suction cup developed as an addition to EJOT’s VACUtest fastener seal-testing kit. The cup is designed to follow the curves of 13.5-3 sinusoidal sheets, also called corrugated sheets, so it can sit over an installed fastener head. The kit’s pump draws air out from beneath the cup to create a vacuum, while the gauge gives the installer an indication of the seal at the fastener washer.
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The intended use is a check of the fastener seal after installation. If the result indicates that washer compression is not sufficiently airtight, the installer can take corrective action. The published material does not give a pass/fail gauge threshold, a test duration, a quantified performance result, or a guarantee against leaks. Those details should not be assumed from the existence of a gauge or the product description.
The reported cup complements VACUtest’s earlier options for flat roofing and cladding sheets. The development addresses a specific geometry problem: a cup made for a flat sheet does not necessarily sit properly over the curved profile of a sinusoidal panel. EJOT’s shaped cup is intended to conform to that profile around the fastener location.
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Roofing Today’s July 2023 report describes the application, the pump-and-gauge method, and the cup’s development. A second trade report in Roofing, Cladding & Insulation also reports the development and the existing cup options.
How does the test work?
The installer positions the shaped cup over the head of an installed self-drilling fastener. The VACUtest pump withdraws air from the space enclosed by the cup, producing a vacuum. The gauge then helps assess whether the washer is compressed enough to create a sufficiently airtight seal at that location.
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In practical terms, the tool addresses a local question: is the seal around this installed fastener sufficiently airtight according to the applicable testing instructions? It is not described as a structural load test, a test of the whole roof assembly, or a substitute for the project’s installation specification. A reading at one fastener cannot establish the condition of every other fixing or the performance of the entire roof.
The reports do not publish a numerical acceptance value or specify how long the vacuum must be maintained. Nor do they describe a universal correction procedure. Follow the current manufacturer guidance and the project’s requirements for how to position the cup, interpret the gauge, and respond to a result. Do not create a pass/fail rule from an unverified gauge value.
Can the cup test both valley and crown fixings?
The 2023 report says the cup is intended to work over a through-valley fixing, described as normal practice for the applications discussed, and can also fit over a crown fixing when rotated 90 degrees. The orientation change is a reported fit feature, not a claim that every profile, fastener, or fixing arrangement is compatible.
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Before specifying the tool, confirm that the panel is the 13.5-3 profile the cup was designed for and check the fixing location. A cup that sits properly at a valley may need a different orientation at a crown. The source does not establish compatibility with other sinusoidal profiles, other panel dimensions, or every screw-head and washer combination. Ask EJOT to confirm the fit for the actual panel and fastener rather than extrapolating from the reported example.
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Scan for outdated or missing drivers - takes under a minuteDriver Scan →Repair Windows errors before they cause bigger problemsFix Now →Fix the driver behind crashes, sound loss and screen glitchesFind Drivers →Jon Knaggs, a technical adviser with EJOT UK’s Applitec team, described the crown orientation in the July 2023 report: “Whilst it’s normal practice to secure through the valley in the overwhelming majority of applications, we are also aware that a crown fastening is used as a secondary fixing. Thus, the new cup design is to some extent future-proofed as it also fits over the panel’s crown by simply rotating the cup through 90 degrees.” That statement explains the reported design intention; it should not be read as a general recommendation to use crown fixing or as confirmation of project-specific suitability.
What should an installer confirm before using VACUtest?
Confirm the panel profile, the location of the fastener, and compatibility between the cup, pump, gauge, fastener head, and washer. The published report identifies 13.5-3 sinusoidal sheets and describes valley and crown fit, but it does not provide a comprehensive compatibility chart. For an unusual profile or fastener arrangement, manufacturer confirmation is especially important.
- Identify the sheet profile. Check that the panel is the 13.5-3 sinusoidal profile covered by the reported development. Do not assume a visually similar corrugated sheet has the same geometry.
- Identify the fixing position. Establish whether the screw is at a valley or crown. The reported cup can be rotated 90 degrees for the described crown application, but the fit should be checked on the actual assembly.
- Confirm the kit and cup are compatible. The sinusoidal cup is an extension to the VACUtest kit. The reports do not establish that any separately sourced cup will work with every pump or gauge, or give current replacement-cup ordering details.
- Use the current instructions. Obtain the applicable EJOT instructions for cup placement, operation, gauge interpretation, and corrective action. The reports refer to usage guidance but do not reproduce an acceptance threshold.
- Keep the scope of the result clear. Record and interpret the check in line with the project’s quality requirements. A seal check at a fastener is not, on its own, an overall roof inspection or compliance determination.
These checks help avoid a common specification error: treating “fits sinusoidal sheets” as a universal compatibility statement. The information available concerns one named panel profile and certain fixing orientations. If the project uses different sheets, fixings, or requirements, confirm those differences with the manufacturer and project designer.
How does the new cup relate to VACUtest’s other cup sizes?
The trade reports list existing flat-sheet cup options with internal diameters of 24 mm and 34 mm, plus a 54 mm option for special applications. Those are reported dimensions, not performance results. The sinusoidal-profile cup is shaped for the sheet geometry; the reports do not provide its internal diameter or a full dimensional drawing.
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| Reported cup option | Reported application or detail | What to verify |
|---|---|---|
| 24 mm internal diameter | Existing cup option for flat roofing and cladding sheets | Fit with the actual fastener and assembly |
| 34 mm internal diameter | Existing cup option for flat roofing and cladding sheets | Fit with the actual fastener and assembly |
| 54 mm internal diameter | Reported for special applications | Whether the application qualifies and whether the cup is compatible |
| Sinusoidal-profile cup | Shaped for 13.5-3 sheets; reported valley use and crown fit after a 90-degree rotation | Exact panel, fixing position, and compatibility with the kit |
The dimensions and applications in this table were reported in 2023; Roofing Today’s account gives the cup-size details. They should not be used as a substitute for current product documentation. In particular, the diameter of a flat-sheet cup does not tell you whether it will seal effectively on a curved sheet profile.
Why did EJOT develop a profile-shaped cup?
According to EJOT’s account reported by Roofing Today, an original equipment manufacturer asked for a cup suitable for sinusoidal sheets. EJOT UK developed the design at its Applitec Centre near Leeds. The report says the research and development team used rapid prototyping to adjust the design and materials, seeking a balance of material hardness that would allow the cup to form a vacuum seal.
That background helps explain why this is a shaped accessory rather than simply another flat cup size: the cup must accommodate the contours around the fixing. The development account comes from the manufacturer as relayed by the trade press. The available data does not include independent validation of the design or quantified results, so it would be inaccurate to turn the development description into a claim about reduced leaks, a particular failure rate, or improved roof life.
What can—and cannot—a VACUtest reading establish?
The stated purpose is to assess the airtightness of the washer compression at an installed fastener. This can give an installer information about the local seal and an opportunity to respond if the seal is not satisfactory under the relevant instructions. The reports do not define the gauge’s exact measurement scale, pass criteria, or sensitivity, so those details must come from current technical documentation.
A local seal check is not proof that a roof is watertight in every condition. It does not, by itself, assess the panel laps, flashing, drainage, substrate, structural fixing capacity, or all other potential causes of water ingress. Nor does the published description say that VACUtest certifies compliance with a building code or project specification. Use it as the specific fastener-seal check it is described to be, alongside—not in place of—the rest of the project’s inspection and quality procedures.
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Similarly, the reports contain no independent performance study or named quantitative outcome. They do not establish how many fasteners should be tested, whether testing is required on every fixing, or how often the test should be repeated. Those are project and manufacturer-instruction questions, not facts that can be inferred from the product announcement.
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.Is the sinusoidal cup a new 2026 product?
No. The available reports date the development announcement to July and August 2023. Roofing Today published its account on 13 July 2023, and Roofing, Cladding & Insulation covered it in its August 2023 issue. The product should therefore be described as a reported 2023 extension to VACUtest, not as a newly launched product in 2026.
The date matters when seeking the kit or accessory. The 2023 reporting does not establish current stock, price, replacement-cup availability, or whether a present-day kit package includes the sinusoidal cup. Contact EJOT for current purchase and technical details, and confirm the precise item is intended for the required profile before ordering.
What is the practical takeaway for a roofing project?
For an installation using 13.5-3 sinusoidal sheets, the shaped VACUtest cup offers a reported way to assess the seal at an installed self-drilling fastener. The design is described for valley fixings and can fit a crown fixing after a 90-degree rotation. Its value is that a cup shaped for the panel profile can be used to perform the local vacuum check described by EJOT, rather than assuming a flat-sheet cup will fit the corrugation.
Specify it only after confirming profile and fastener compatibility, obtaining current operating and interpretation guidance, and incorporating the check into the project’s quality process where appropriate. Do not treat a gauge indication as a weatherproofing guarantee or a substitute for the project specification. The 2023 reports establish the design intent and basic operation; they do not establish universal fit, current commercial availability, or a numerical pass/fail standard.
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Frequently Asked Questions
Does VACUtest prove that a corrugated roof will not leak?
No. It checks the seal at the tested fastener; it does not assess every fixing, sheet joint, flashing, or other possible source of water ingress. Roof-level conclusions require the broader inspection and acceptance process defined for the project.
Where can I find the pass value for the VACUtest gauge?
The 2023 trade reports do not publish a numerical acceptance value. Request the current operating instructions and project-specific criteria from EJOT or the responsible project team rather than applying a threshold from another system.
Can I use the cup on any corrugated metal sheet?
The reported design is for 13.5-3 sinusoidal sheets, not every corrugated profile. Similar-looking sheet shapes can differ, so confirm compatibility for the actual panel and fastener before relying on the cup.
Is the sinusoidal cup included with every VACUtest kit?
The reports describe it as an addition to the existing kit but do not establish present-day package contents or replacement-cup ordering options. Check the current kit specification with EJOT before purchase.
