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EJOT reveal beads with mesh are designed to absorb movement at the junction between an external wall insulation (EWI/ETICS) render system and a window or door frame. When the profile matches the expected movement, insulation thickness, opening size and system specification—and is bonded correctly—it can help maintain a neat, driving-rain-resistant connection and reduce the risk of cracks. That is the intended performance of a suitable, correctly installed detail, not a universal guarantee that every installation will remain crack-free.
The junction moves because the rendered insulation shell responds to temperature changes while the frame is stressed by wind and building movement. EJOT’s guidance says the reveal bead and its mesh must accommodate those movements while keeping the connection weather-tight. The practical question is therefore not simply which bead is cheapest, but which profile, adhesive and installation method suit the complete EWI system.
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Why do EWI window and door reveals need a movement-absorbing bead?
A reveal is the narrow return around a window or door opening. In an EWI system, the insulation boards, basecoat, reinforcing mesh and finish plaster form a weather-exposed shell, while the frame is a separate component. These materials do not expand, contract or flex in exactly the same way.
Temperature changes make the plaster shell move. Wind places stress on the window or door frame. If the connection is too rigid, poorly bonded or unable to accommodate movement in three dimensions, stress can concentrate at the edge of the opening. Typical consequences include a hairline crack, an open joint, water penetration or a visibly untidy plaster line.
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EJOT explains that these movements must be absorbed by a reveal bead with mesh so the connection remains permanently driving-rain-resistant under those effects. The bead creates a defined interface: its mesh is embedded in the reinforcement layer, while the profile and sealing element connect to the frame. The result depends on the whole detail—profile selection, substrate preparation, adhesive, board position, plaster build-up and the approved EWI system—not on the bead alone.
Read EJOT’s guidance on what must be taken into account with reveal beads with mesh and its advice on plaster connections to windows before specifying a detail.
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How do EJOT Pro GAP reveal beads differ?
The Pro GAP family is not interchangeable. The profiles use different movement-absorption features and have different stated performance information, so select the exact model required by the opening and the EWI system supplier.
| Profile | Movement feature or stated use | Published limits or classification |
|---|---|---|
| EJOT Pro GAP | Hard PVC profile with 160 g alkali-resistant, non-shifting glass-fibre mesh and a 12.5 cm mesh flag. Movement absorption relies on the elasticity of the polyethylene sealing tape. | Use only where that movement capacity and the complete system detail are adequate. |
| Pro GAP Active Flex | High-movement profile for window and door connections where substantial compensatory movement is expected. EJOT cites increased three-dimensional movement absorption in ift test report 20-002069-PR02. | Suitable, according to EJOT, for up to 300 mm insulation thickness and a 10 m² window size. |
| Pro GAP Power Flex | High-movement option for situations requiring high compensatory movement. | EJOT states driving-rain connection class A according to the VDPM leaflet, with suitability up to 300 mm insulation thickness and a 10 m² window size. |
| Pro GAP Giga Flex | High-movement profile with an integrated thermoplastic-elastomer loop. | EJOT states suitability up to 300 mm insulation thickness and a 10 m² window size. |
The test report and rain classification apply to the stated product and test basis. They do not independently verify every installed connection or every possible combination of frame, plaster and EWI system. Confirm the current technical data and the system supplier’s approved detail before treating a model as suitable.
How should you select a reveal bead for an EWI project?
Start with the opening and system requirements, then choose the profile. A high-movement bead is not automatically the right answer if its geometry, plaster allowance or bonding method does not match the project.
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- Estimate expected movement. Consider frame size, exposure, construction movement and the likely differential movement between the frame and rendered insulation. If high compensatory movement is expected, investigate the Active Flex, Power Flex or Giga Flex ranges rather than assuming standard Pro GAP is equivalent.
- Check the opening size and insulation thickness. EJOT states limits of up to 300 mm insulation thickness and 10 m² window size for Active Flex, Power Flex and Giga Flex. A larger opening or thicker build-up needs a project-specific confirmation.
- Confirm driving-rain requirements. Exposure and the required connection classification affect the detail. Power Flex is the model for which EJOT states class A according to the VDPM leaflet; check what classification the building specification demands.
- Match plaster thickness and profile geometry. The bead must sit correctly at the reveal edge and allow the specified basecoat, reinforcement and finish thickness. A profile that leaves too little cover or creates a step can compromise the finish even if its movement capacity is adequate.
- Verify frame-substrate adhesion. The frame finish, coating, foil and cleanliness determine whether the adhesive can form a reliable bond. An adhesive test on a concealed area is part of EJOT’s guidance.
- Obtain system approval. EJOT says its ETICS products are supplied through system suppliers. Ask the supplier to confirm the exact profile, adhesive, mesh overlap and processing sequence for the selected EWI system.
Keep the product data sheet, system approval and adhesive-test record with the project file. This makes the selection auditable if a later inspection finds cracking or water ingress.
What do you need before installing a reveal bead?
Have the correct profile length, compatible adhesive, clean tools, the approved EWI processing instructions and a way to document the adhesion test. Installation should not begin on a contaminated, wet or unstable frame surface.
- Confirm the profile model, length, mesh width and plaster build-up against the system specification.
- Check that the frame and adjacent insulation board are sound, level and accessible.
- Use a clean, dry surface free from dust, grease, release agents and loose coatings.
- Plan the bead so it can run continuously. EJOT advises avoiding cuts, except in the upper third when the available delivery length is exceeded.
- Check weather and substrate conditions specified by the adhesive and system supplier.
How do you install an EJOT reveal bead with mesh?
The sequence below reflects EJOT’s service guidance; the current product processing instructions and the approved EWI system detail take precedence if they differ.
- Carry out an adhesion test. On a clean, suitable and concealed area of the frame, apply the intended adhesive and test the bond. EJOT specifies a substrate temperature of at least +5 °C and no more than +40 °C for this test. Record the date, location, temperature, adhesive and result.
- Prepare the final bonding area. Remove dust and grease and ensure the frame surface is dry and stable. Do not rely on a test performed on a different coating or contaminated area.
- Dry-fit and align the profile. Position the bead at the front edge of the insulation board while keeping its adhesive contact on the frame. Check that the mesh will lie in the reinforcement layer and that the profile is straight.
- Apply adhesive evenly. Use the approved adhesive in a continuous, even application that gives the required contact. Do not leave voids or isolated dabs that can allow the profile to flex independently.
- Press the bead firmly into place. Bond directly to the frame and press along the length so the adhesive wets the contact surface. Keep the profile stress-free; do not stretch, bow or force it around the opening.
- Prevent cavities and obstructions. Make sure the profile is fully supported and that protruding connection foils or other details do not reduce the intended adhesion area.
- Integrate the mesh. Embed the mesh flag into the basecoat and reinforcement layer with the specified overlaps and cover. Maintain the designed plaster thickness around the profile.
- Finish the reveal. Apply the render layers without bridging, trapping debris or moving the profile. Protect the joint until the adhesive and basecoat have cured in accordance with the system instructions.
A bead that is correctly aligned but only partly bonded can still fail at the frame interface. Conversely, a strong adhesive cannot compensate for a profile selected for insufficient movement or installed under tension.
What installation mistakes cause cracking or leaks?
Most problems are detail failures rather than a lack of mesh. The following checks help identify the likely cause.
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| Observed problem | Likely cause | Corrective focus |
|---|---|---|
| Crack follows the frame line | Insufficient movement capacity, profile installed under stress, or mesh not embedded correctly. | Review movement assessment, profile model, continuity and reinforcement overlap; do not simply fill the crack and repaint. |
| Local debonding or hollow sound | Dust, grease, unsuitable coating, uneven adhesive or cavities behind the profile. | Investigate the substrate and adhesive-test result; repair according to the system supplier’s method. |
| Water marks at the reveal | Incomplete frame seal, open joint, poor rain-detail integration or damaged profile. | Check the complete window-to-EWI junction, not only the visible plaster surface. |
| Bead sits proud or creates a visible ridge | Wrong profile geometry, incorrect board position or inadequate plaster cover. | Compare the installed build-up with the approved section before applying more finish. |
| Short cracks at a cut or joint | Unplanned piece cuts or discontinuity in the upper corner. | Use full lengths where possible and follow EJOT’s restriction on cutting. |
Do not assume that a product’s published rain class or movement test guarantees the installed result. The classification is tied to the stated product and test basis; workmanship, frame condition and system compatibility remain decisive.
Where can the profiles be specified and supplied?
EJOT states that its ETICS products are available through system suppliers. For that reason, the most reliable route is to specify the bead through the supplier responsible for the complete EWI system or a specialist construction distributor that can provide the current technical data.
Ask for the exact product name, delivery length, mesh specification, compatible adhesive and installation sheet. For EJOT’s ETICS service, confirm whether an adhesive test or technical consultation is available for the project. Product names, limits and supply routes can change, so verify them against the current documents at the time of ordering.
What must be recorded for quality assurance?
A concise installation record can prevent disputes and makes future diagnosis easier. Record the EWI system and version, frame manufacturer and surface type, selected profile, insulation thickness, opening dimensions, expected exposure, adhesive batch, substrate temperatures, adhesion-test result, installer, date and photographs before the mesh is covered.
Photograph the profile at the front edge of the board, the continuous adhesive contact to the frame and the mesh embedded in the basecoat. Keep the photographs with the system supplier’s approval and the product data sheet. If the opening changes during construction, repeat the selection check rather than treating the original bead as automatically suitable.
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Frequently asked questions
Can a standard Pro GAP bead be used on every window?
No. Standard Pro GAP relies on the elasticity of its polyethylene sealing tape, while the Flex models use other features for higher movement absorption. The correct choice depends on expected movement, opening size, insulation thickness, plaster build-up and the approved EWI system.
Does a driving-rain class A rating mean the installed joint cannot leak?
No. EJOT states class A for Pro GAP Power Flex according to the VDPM leaflet, but a classification relates to the specified product and test basis. Frame preparation, adhesive coverage, continuity, mesh integration and the rest of the window detail still determine the installed joint.
What temperature is acceptable for the adhesion test?
EJOT’s guidance specifies a substrate temperature from +5 °C to +40 °C for the reveal-bead adhesive test. Follow the adhesive and system manufacturer’s current instructions if they impose a narrower range for application or curing.
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EJOT advises avoiding cuts, except in the upper third when the delivery length is exceeded. Unplanned cuts can interrupt the movement and weathering detail, so use a continuous length wherever the approved installation method requires it.
Who should approve the final profile choice?
The designer or installer should check the opening against the complete ETICS/EWI specification, and the system supplier should confirm compatibility. EJOT’s products are supplied through system suppliers, so obtain written confirmation when movement, exposure, insulation thickness or opening size is outside a routine detail.
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Frequently Asked Questions
Can a standard Pro GAP bead be used on every window?
No. Standard Pro GAP relies on the elasticity of its polyethylene sealing tape, while the Flex models use other features for higher movement absorption. The correct choice depends on expected movement, opening size, insulation thickness, plaster build-up and the approved EWI system.
Does a driving-rain class A rating mean the installed joint cannot leak?
No. EJOT states class A for Pro GAP Power Flex according to the VDPM leaflet, but a classification relates to the specified product and test basis. Frame preparation, adhesive coverage, continuity, mesh integration and the rest of the window detail still determine the installed joint.
What temperature is acceptable for the adhesion test?
EJOT’s guidance specifies a substrate temperature from +5 °C to +40 °C for the reveal-bead adhesive test. Follow the adhesive and system manufacturer’s current instructions if they impose a narrower range for application or curing.
Can the bead be cut to fit short sections?
EJOT advises avoiding cuts, except in the upper third when the delivery length is exceeded. Unplanned cuts can interrupt the movement and weathering detail, so use a continuous length wherever the approved installation method requires it.
Who should approve the final profile choice?
The designer or installer should check the opening against the complete ETICS/EWI specification, and the system supplier should confirm compatibility. EJOT’s products are supplied through system suppliers, so obtain written confirmation when movement, exposure, insulation thickness or opening size is outside a routine detail.
