How to Install 3D Gypsum Wall Panels | Kandes

Swiss gypsum contractors operate in one of the most quality-conscious built environments in Europe. A decorative 3D gypsum panel installation on a Swiss residential or commercial site will be looked at closely — by the client, by the architect, and sometimes by a building inspector reviewing handover documentation under SIA 118. This guide covers the complete Kandes installation sequence, from substrate assessment to compliant handover, with the adhesive specifications and technique details that determine whether a Kandes panel wall performs for decades or starts showing joint cracks at the first annual inspection.

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 Swiss interior 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

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 — the standard expected on Swiss premium projects.

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 installation videos — 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.

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 across Swiss seasonal temperature ranges. 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 — a Swiss company with production in the European Union — produces panels that 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: Under SIA 118 (general contract for building work), the contractor's obligation extends to providing complete material records at project completion. For a Kandes panel installation, the minimum handover record should include: panel family and article number, number of panels installed, adhesive batch number, primer product used, paint colour (RAL), and date of installation. For commercial projects, include the Kandes A1 fire certificate in the handover package — this is standard practice for Swiss building authority submissions.

A Note on Fire Compliance

Kandes gypsum 3D panels are classified A1 non-combustible per EN 13501-1 — the highest European fire performance classification for construction products, also applicable under Swiss building regulation harmonisation. For commercial Swiss installations, include the Kandes A1 certificate in the project documentation submitted under SIA 118.

Full guidance on A1 classification, certificate sourcing, and specification for hospitality and commercial environments is in the post A1 Non-Combustible Wall Panels and EN 13501-1.

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.

For homeowners planning a renovation and considering where a 3D panel wall works best in a Swiss interior, the post Where to Install 3D Gypsum Wall Panels in a Private Home covers room-by-room placement decisions in detail.