Most failed gypsum panel installations trace back to the same two decisions: the wrong adhesive and inadequate substrate preparation. This guide is written for professional gypsum and drywall contractors — not homeowners or generalists. It covers the complete sequence for installing Kandes 3D gypsum wall panels, from the site check through handover documentation, with the material tolerances and technique details that determine whether the result holds for twenty years or starts showing joint cracks at the first heating season.
Table of Contents
- Before You Start: Substrate Requirements and Acclimatisation
- Tools and Materials Checklist
- Setting Out: The First Row Decision
- Adhesive Application
- Panel Placement and Alignment
- Joint Filling and Seamless Finishing
- Priming, Painting, and Handover
- A Note on Fire Compliance
- Frequently Asked Questions
Before You Start: Substrate Requirements and Acclimatisation
The quality of a 3D gypsum panel installation is set before the first panel touches the wall. Substrate condition determines whether the adhesive bond will hold, whether joints remain invisible through seasonal temperature cycles, and whether the surface accepts paint uniformly. Rushing this stage is the single most common source of callbacks on decorative panel work.
Substrate types: what works and what does not
Kandes gypsum 3D panels install successfully over four substrate types, each with specific preparation requirements:
Drywall (plasterboard): The most forgiving substrate. Prime with one coat of PVA-based primer before adhesive application — raw drywall paper absorbs moisture from gypsum adhesive too quickly, weakening the bond. Confirm the board is correctly fixed: any flex in the substrate will telegraph through the panel face over time.
Concrete and block: Sand or brush to remove release agent, efflorescence, or paint that is not fully bonded. Prime with a penetrating primer — standard PVA alone is insufficient on smooth concrete. Fill any surface hollows deeper than 3mm before beginning the panel layout.
Existing plaster: Sound plaster can be installed over directly. Coin-tap the surface across the full installation area — hollow notes indicate delaminating sections that must be cut out and refilled. Painted plaster is acceptable if the paint is well adhered; loose or flaking paint must be removed mechanically.
Primed wood (MDF, plywood): Must be primed and fully cured. Apply a flexible primer and allow 24 hours before panelling. Not recommended for rooms with high seasonal humidity variation.
Flatness tolerance: ≤3mm in 3m
Per the Gypsum Association standard GA-216-2024 and confirmed by trade practice in Walls & Ceilings, the maximum allowable deviation for adhesive-applied decorative gypsum panels is ≤3mm measured over a 3-metre span. Check with a 3m aluminium straightedge. High points should be sanded or ground flat; low points filled with gypsum-based filler and allowed to cure fully before panelling.
A substrate that fails this tolerance produces visible panel rocking during placement — and adhesive voids that create point-load failure over time.
Panel acclimatisation: 24 hours on site
Kandes panels are produced from natural gypsum and must acclimatise on site for a minimum of 24 hours in the installation room before work begins. Panels brought directly from a cold vehicle into a heated room absorb ambient humidity at a rate that causes dimensional change during installation. Store stacked flat, packaging loosened, in the room where they will be fixed.
Tools and Materials Checklist
| Item | Specification / Purpose |
|---|---|
| Gypsum-based adhesive putty | 3 kg/m² — only approved adhesive type (see section below) |
| Toothed trowel | 1cm tooth gap — for adhesive combing on both panel back and wall |
| Aluminium profile / straightedge | 3m minimum — sets the datum for the first row |
| Spacers | 1.5–3mm — maintain consistent joint gap between panels |
| Spirit level | 600mm + 1200mm — plumb and level check at each row |
| Hacksaw (fine-tooth) | Straight cuts; fine tooth reduces breakage risk at the cut edge |
| Razor knife | Electrical knockout cuts; score-and-pressure for thin sections |
| Dust mask (FFP2 minimum) | Required for all gypsum cutting operations |
| Rubber sanding block, N220 | Joint finishing after 24h cure |
| Spray applicator or short-pile roller | Primer and paint application over high-relief surface |
Setting Out: The First Row Decision
The first row of a 3D gypsum panel installation determines the visual result across the entire wall. It is worth an extra hour of layout before mixing any adhesive.
Continuous pattern vs. visible-joint approach
Professional gypsum panel work uses one of two approaches:
Continuous (seamless) pattern: Panels are aligned so the surface relief flows without visible breaks between units. This is the more demanding technique — it requires precise panel selection for pattern continuity, careful spacer discipline, and same-day joint filling before adhesive cures. The result is a continuous 3D surface rather than a tiled grid. Kandes recommends this approach for all premium residential and hospitality installations.
Grid pattern: Panels are installed with a deliberate visible joint — typically 3–5mm — as a design element. Simpler to execute and more forgiving of minor substrate variation. Appropriate for geometric panel families where the panel edge forms part of the aesthetic.
For detailed technique on the continuous-pattern finish, refer to the Kandes video installation tutorials — the primary practitioner resource for Kandes-specific installation.
Setting the horizontal datum
Fix a horizontal aluminium profile at the base of the installation area at the height of one panel. Use a level to confirm horizontal across the full wall width — a 2mm error at this stage reads as pattern drift over three or four rows. Install the first full row above the profile, with spacers in place. Remove the profile once the first row's adhesive has tacked (approximately 2 hours).
Adhesive Application
Adhesive selection is where most non-specialist contractors make an error that shows up six to twelve months later. Kandes gypsum 3D wall panels require gypsum-based adhesive putty only — not polymer adhesive, not tile cement, not universal construction adhesive. Gypsum-to-gypsum adhesion produces a bond that matches the thermal expansion coefficient of the panel material. Polymer adhesives remain slightly flexible after cure and allow micro-movement at the bond line — in a panel with significant surface relief, this translates to joint cracking within the first heating season.
Coverage rate: Mix to medium consistency and apply at 3kg per m², covering both the back of the panel and the wall surface with a combed layer. Use a toothed trowel with a 1cm tooth gap. The double application — panel back and wall surface — creates the mechanical interlock that makes the bond durable. This step is frequently skipped by contractors unfamiliar with the material; it is non-negotiable.
Open time: Gypsum putty has a working time of approximately 30 minutes on the wall surface at normal indoor conditions (18–22°C, 40–60% relative humidity). Work in sections you can complete in 25 minutes; reserve the final 5 minutes for position adjustment. Do not mix more than you can place within that window.
Panel Placement and Alignment
Install panels left to right from the datum row, working upward. Press each panel firmly across the full surface — not just at the corners — and confirm level and plumb before the adhesive begins to skin.
Spacers: Insert 1.5–3mm spacers at every joint. This gap is functional, not merely aesthetic: it accommodates the thermal and humidity expansion cycles of the gypsum material. A zero-gap installation will develop joint cracking regardless of adhesive quality.
Cutting on site: Use a fine-tooth hacksaw for straight cuts. Score the cut line at least 5mm deep before applying cut pressure to prevent fracture along the panel face. For electrical knockouts, score the outline with a razor knife and apply pressure from the panel back. Do not use angle grinders — the heat generated disrupts gypsum crystal structure at the cut edge.
Joint Filling and Seamless Finishing
Joint treatment is the skill that separates a professional finish from a visible tile grid. The sequence is fixed and non-negotiable.
Same-day filling: Fill joints on the day of installation, before the main adhesive body has fully cured. Use the same gypsum putty, pressed into the joint with a clean finger or narrow filler knife. The fill should be slightly proud — it will be sanded flush after curing.
Wet sponge, immediately: Wipe excess putty from the panel face with a damp (not wet) sponge immediately after filling each joint. Gypsum adhesive left on the textured panel surface will harden and embed in the surface relief within two hours — at that point, removal requires mechanical sanding that damages the panel face.
Sanding after 24 hours: Once the fill has cured (minimum 24 hours), sand joints with N220 grit on a rubber block. Sand joints only — never across the panel face. The goal is a flush joint; the 3D texture of the panel surface remains intact.
Priming, Painting, and Handover
Allow the completed panel wall to cure for a minimum of 24 hours before primer application. The gypsum adhesive and fill are still releasing moisture during this period; sealing the surface too early traps humidity and can cause blistering under the paint film.
Primer: Apply by spray where possible — a roller leaves dry spots in deep pattern recesses that show as colour variation after the finish coat. One full-wall coat is sufficient. Allow 2–3 hours before the top coat.
Paint: Standard interior emulsion, any RAL colour. Kandes gypsum panels — a Swiss producer with manufacturing in the EU — accept water-based and solvent-based paint equally. The colour choice is the client's decision. Note that depth of surface relief affects perceived colour saturation: darker shades appear more intense in recesses and lighter at panel peaks, which is part of the three-dimensional aesthetic.
Handover documentation: Every completed installation should include a written handover record. Minimum content: panel family and article number, number of panels installed, adhesive batch number, primer product used, paint colour (RAL), and date of installation. This record supports the contractor's professional liability position and provides the client with the information needed for future maintenance or expansion of the installation.
A Note on Fire Compliance
Kandes gypsum 3D panels are classified A1 non-combustible per EN 13501-1 — the highest fire performance rating for construction products under European standards. For commercial projects, include the Kandes A1 certificate in the project documentation submitted to the client or building control authority.
Full guidance on the A1 classification, certificate sourcing, and specification for hospitality and commercial environments is in the post A1 Non-Combustible Wall Panels and EN 13501-1. Swiss contractors working under SIA 118 should note that A1 documentation is standard practice for commercial project handover in the Swiss market.
Frequently Asked Questions
What adhesive should I use for 3D gypsum wall panels?
Gypsum-based adhesive putty only. Coverage rate is 3kg/m², applied to both the back of the panel and the wall surface using a toothed trowel with a 1cm tooth gap. Polymer adhesives and tile cements allow micro-movement at the bond line that causes joint cracking in the medium term.
Can Kandes panels be installed on plasterboard (drywall)?
Yes. Prime the drywall with one coat of PVA-based primer and allow it to dry fully before applying adhesive. Confirm the board is correctly fixed — any substrate flex will cause panel movement over time.
How long before I can paint after installation?
Allow 24 hours after panel installation before applying primer. After primer, allow 2–3 hours before the finish coat. Sealing too early traps residual moisture from the gypsum adhesive and risks blistering.
How do I cut 3D gypsum panels without breaking them?
Use a fine-tooth hacksaw for straight cuts; score the cut line at least 5mm deep before applying cut force. For electrical knockouts, score with a razor knife and press from the back of the panel. Never use angle grinders — the heat disrupts the gypsum crystal structure at the cut edge.
What is the minimum flatness requirement for the substrate?
≤3mm deviation measured over a 3-metre span, per GA-216-2024. Check with a 3m straightedge before applying any adhesive. High points should be sanded flat; low points filled and fully cured.
Can Kandes panels be installed over a painted wall?
Yes, if the existing paint is firmly adhered. Knock-test the surface across the full installation area — hollow notes indicate delaminating paint that must be removed before panelling. Firmly adhered paint should be lightly abraded to improve adhesive keying.
Download the Installation Manual
The Kandes text-based installation manuals cover the full installation sequence in printable format, including substrate-specific guidance and the seamless joint technique in detail. For technical support on a specific project, or to enquire about certified installer partnership, contact Kandes directly.
For homeowners planning a renovation and considering where a 3D panel wall works best, the post Where to Install 3D Gypsum Wall Panels in a Private Home covers room-by-room placement decisions in detail.
Sources
- Gypsum Association — GA-216-2024: Application and Finishing of Gypsum Panel Products — https://gypsum.org/2019/04/ga-216-2018-application-and-finishing-of-gypsum-panel-products/ — Substrate flatness tolerance (≤3mm/3m), adhesive application guidance, acclimatisation recommendations.
- Eurogypsum — European Gypsum Association — https://www.eurogypsum.org/ — Gypsum material properties in EU context.
- CEN — EN 13501-1 Fire Classification Standard — https://www.cencenelec.eu/ — A1 non-combustible classification referenced in fire compliance section.
- SIA — Schweizerischer Ingenieur- und Architektenverein — https://www.sia.ch/ — SIA 118 (general contract for building work) cited for Swiss contractor document
Share:
Feature Walls in Contemporary Interior Architecture: Biomorphic Design and the Rise of 3D Gypsum Wall Panels