Wall Sandwich Panels · Concealed Fix
Secret Fix Wall Sandwich Panel (Concealed Fixing)
The Secret Fix Wall Sandwich Panel is the concealed-fix option in the Jawdah wall panel range: an insulated PIR panel whose fasteners sit inside the side joint so the finished façade shows no exposed screw heads.
Secret fix, also called concealed fix or hidden fix, describes how a panel is attached rather than what it is made of. The fastener passes through the panel edge into the supporting rail and is then covered by the next panel as it engages the joint. The result is a clean elevation with only the joint lines visible.
Jawdah lists this panel as part of its wall range, but the source data does not yet publish its joint drawing, cover width or face profile. This page therefore explains the concealed-fix concept, the Jawdah wall-family facts that logically apply, and the item details that are confirmed per project.
- Fixing methodConcealed in the side joint
- Profile dataConfirmed per project
Quick answer
A secret fix wall sandwich panel is an insulated façade panel fixed through its side joint so that the screws are hidden behind the adjoining panel. It gives a smooth, fastener-free elevation for offices, showrooms and architectural façades. Jawdah offers it within its PIR wall range; joint geometry, cover width and profile data are provided by the Jawdah team per project.
What a secret fix panel is and why designers ask for it
On a standard industrial wall, screws pass through the face of each panel into the steel rail behind, leaving rows of washers visible across the elevation. A secret fix panel moves those fasteners into the joint. Architects ask for it when the façade is part of the building's identity and the wall should read as a continuous surface rather than as cladding.
Concealed fixing also keeps the face sheet unpunctured, which removes a large number of sealed penetrations from the weather face. That is a practical benefit on coastal sites such as Jeddah and Dammam, where every exposed fixing is a potential point for corrosion staining.
How concealed fixing works in principle
Each panel has a male and a female edge. During installation the installer seats the panel, drives fasteners, sometimes through a clip or fixing plate, through the exposed edge into the rail, then slides the next panel's edge over them. The overlap hides the fasteners and forms the visible joint line.
Because the fixings are inside the joint, the joint design carries the wind load from the face to the structure. The number and type of fasteners per panel are therefore set by the structural engineer from the wind exposure and rail spacing, using the manufacturer's joint data.
Jawdah wall-family data that applies, and what is pending
The Jawdah source names the Secret Fix Wall Sandwich Panel but provides no item-specific text. The wall-family facts below come from the Jawdah product data for wall panels and logically apply to any panel built on the same PIR core. Item-specific values are listed as confirmed per project.
| Topic | Status for the secret fix panel |
|---|---|
| Insulation core | PIR, stated to meet DIN 4102 B2 fire classification (core material) |
| Wall thermal data | 50 mm U 0.48, 75 mm U 0.32, 100 mm U 0.23 W/m²K (family table) |
| Covering materials | PPGI, aluminium, stainless steel or galvanized iron (family) |
| Coatings and colour | Polyester or PVDF; standard Cloud White, others on request (family) |
| Joint geometry and cover width | Confirmed by Jawdah per project |
| Face profile and thicknesses offered | Confirmed by Jawdah per project |
| Fixing clips and fastener schedule | Confirmed by Jawdah per project |
Where a concealed-fix wall panel is the right choice
Use a secret fix panel where the wall is seen up close or forms the main street elevation: office blocks attached to factories, showrooms, retail and commercial frontages, public buildings, and clean internal walls where fastener heads would collect dirt. Industrial rear elevations rarely need it, and a through-fixed face such as the Semi-Corrugated Wall Sandwich Panel is usually more economical there.
- Office and administration façades of industrial plants
- Showrooms and commercial frontages
- Public and institutional building elevations
- Smooth internal walls in clean or food areas
Specifying a secret fix façade
Treat the façade as a system. Agree panel orientation, joint module and opening positions before the rail layout is fixed, because a concealed-fix wall tolerates less site adjustment than a through-fixed one. Window heads, sills and corners need purpose-made trims; plan them with the Flashings & Accessories range from the start.
Select thickness from the thermal target using the Jawdah wall table, then ask the Jawdah team to confirm which thicknesses, face finishes and colours are available in the concealed-fix profile for your project.
Installation points specific to hidden fixing
Rails must be straight and in one plane, since the panel cannot be pulled into line by a face screw. Install in one direction only, starting from a true vertical or horizontal reference, and check the joint line every few panels. Replacing a damaged panel in the middle of a concealed-fix wall usually means working back from the nearest end or using a replacement method agreed with the supplier, so protect installed panels from site damage. Follow the Jawdah Installation Manual, which is available in hard copy.
Typical errors with concealed-fix wall panels
Concealed fixing raises the standard of the whole façade, so small omissions become visible.
- Assuming concealed fixing needs fewer fasteners; the engineer sets the schedule
- Ordering panels before openings and joint modules are frozen
- Leaving corner and opening trims to be improvised on site
- Specifying concealed fix on hidden rear elevations where it adds no value
- Expecting the fixing method to change the fire classification of the PIR core
Secret fix compared with through-fixed and grooved panels
A through-fixed wall is quicker to adjust and generally cheaper; a secret fix wall looks cleaner and has fewer face penetrations. The Secret Fix with Groove Wall Sandwich Panel keeps concealed fixing but adds a recessed joint line, which is chosen when the façade should show a crisp shadow line between panels.
| Aspect | Through-fixed panel | Secret fix panel |
|---|---|---|
| Visible fasteners | Yes, on the face | No, hidden in the joint |
| Face penetrations | Many | Few or none |
| Site adjustment | Easier | Needs accurate rails |
| Typical use | Industrial elevations | Architectural façades |
Key facts
- The Secret Fix Wall Sandwich Panel is the concealed-fix option in the Jawdah wall sandwich panel range.
- In a secret fix panel the fasteners are placed in the side joint and hidden by the adjoining panel.
- Jawdah wall panels use a PIR core stated to meet the DIN 4102 B2 fire classification of the core material.
- Jawdah publishes wall U-values of 0.48, 0.32 and 0.23 W/m²K for 50, 75 and 100 mm panels.
- Joint geometry, cover width and fixing schedule of the Jawdah secret fix panel are confirmed per project.
- Concealed-fix wall panels are typically chosen for architectural, office and showroom façades.
RFQ / BOQ checklist
- Elevation drawings showing the concealed-fix areas
- Panel orientation: vertical or horizontal
- Required thermal value or panel thickness
- Face finish, coating and colour
- Joint module and opening positions
- Wind exposure data and rail spacing for the engineer
- Corner, opening and base trims required
- Request for joint details and fixing schedule
- Delivery city and programme
Closer look
Technical resources
Technical document
Technical data sheet: Secret Fix Wall Sandwich Panel (Concealed Fixing) (Rev. 12)
English · 1.3 MB
Sent by emailRequest FileTechnical document
Technical data sheet: Secret Fix Wall Sandwich Panel (Concealed Fixing) (Rev. 2)
English · 2.7 MB
Sent by emailRequest File
13–14In preparation
Further chapters in preparation
These parts of the product page are being prepared with the Jawdah technical team and will be published once verified.
Projects using this product
Project references are being prepared.
Compatible systems
System relationships for this product are being prepared.
Our technical team can share the current information on request.
Ask the technical teamFrequently asked questions
What does secret fix mean on a sandwich panel?
It means the fasteners are placed inside the side joint and covered by the next panel, so no screw heads are visible on the finished wall.
Does Jawdah publish the joint dimensions of the secret fix panel?
Not yet. The Jawdah source names the product without item data. Joint geometry, cover width and the fixing schedule are confirmed by the Jawdah team for each project.
Is the insulation different in a secret fix panel?
The concealed-fix option belongs to the Jawdah PIR wall range, so family core data such as the DIN 4102 B2 classification of the core apply. Confirm the thickness for your project against the wall U-value table.
Is a secret fix wall more weather-tight?
It removes most fasteners from the weather face, which reduces sealed penetrations. Weather performance still depends on correct joint sealing, flashings and installation.
Can secret fix panels be used for cold rooms?
Cold room walls are selected mainly for thermal and hygiene needs. A concealed-fix face can help on clean walls, but confirm the panel build-up with Jawdah using the cold room requirements.
Is a secret fix panel more expensive?
Jawdah does not publish fixed prices. Concealed-fix walls typically need more accurate framing and purpose-made trims, so request a project quotation with drawings.
What documents should I request?
Ask for the Sandwich Panel Technical Data Sheet, the System Catalogue and the Installation Manual, which is available in hard copy, and the joint details for the concealed-fix profile.
15Next step
Plan a concealed-fix façade with Jawdah
Share your elevations, thermal target and colour. The Jawdah team will confirm the concealed-fix profile data, trims and a quotation for your project.