Stone cladding: substrate checks before installation
Before booking the installation, identify what the cladding will be fixed to. A sound-looking wall, painted finish or insulation system needs its own checks. Ristone’s existing installation guidance describes preparation by substrate; it does not replace the fixing specification for your selected model and wall.
Establish the load before preparing the surface
The existing Ristone guidance refers to a substrate able to support approximately 40 kg/m². That is not approval for every model in the range. The product-sheet calculations give approximately 20-49 kg/m² for stone-effect cladding and 15-27 kg/m² of wall for concrete brick slips with a 10 mm joint, excluding adhesive and jointing material.
Cumbria at approximately 49 kg/m² and Himalaya at approximately 47 kg/m² exceed the figure in that general guidance. Ask Ristone to confirm the substrate and fixing arrangement for those models before ordering. For a finish over external insulation, the system documentation must also cover the proposed cladding; see the specification guide.
Identify the existing surface
These preparation notes come from Ristone’s installation instructions. Confirm them against the chosen adhesive and substrate before work begins.
| Existing surface | Preparation described in the Ristone guidance |
|---|---|
| Masonry | Remove excess plaster or mortar. Use a suitable flexible internal or external adhesive, applied with a notched trowel to both substrate and back of the piece, following the adhesive manufacturer’s instructions. |
| Damaged or weak surfaces | Brush away dust and loose material. Reinforce weakened surfaces with fibreglass mesh and adhesive; apply a penetrating primer after cleaning. |
| Metal or timber | Waterproof and reinforce with fibreglass mesh and adhesive. Ask for the complete arrangement for the actual wall. |
| Concrete and mineral surfaces | Degrease, clean and prime to control water absorption. |
| Gypsum or plasterboard | The guidance says to avoid cement-based adhesives on gypsum and plasterboard because reactions can lead to detachment. It also describes roughening plasterboard for adhesion. Confirm suitability and load capacity before applying a finish. |
| Painted or varnished surfaces | Remove the coating by sanding or scraping. Where removal is not possible, the guidance describes degreasing, cleaning and reinforcement with fibreglass mesh and adhesive. Confirm the arrangement for the existing coating. |
Preparation alone does not establish the load capacity of the wall. Give the installer and Ristone the substrate details and model weight together.
Check conditions and adhesive instructions
Ristone warns that installation at very low or very high temperatures can cause pieces to detach. The permitted working temperatures come from the selected adhesive’s technical sheet; this guide does not assign a universal temperature range.
The existing guidance describes dampening very dry or warm substrates and adhesive before application. Confirm the method with the selected adhesive manufacturer’s instructions rather than changing a mix or application procedure by guesswork.
Agree the remaining installation detail
Ask for the chosen model’s instructions covering fixing stages, joints and finishing. Resolve external corners and course layout before starting, including where the finish meets copings or sills. The pier and plinth planning guide helps organise the measured areas and corner heights.
Describe the substrate, indoor or outdoor exposure, chosen model, measurements and destination in the project enquiry form. After submitting the form, send sketches or photographs on WhatsApp or by email using the details on the contact page. Start from the stone-effect range or concrete brick slips and request the current instructions with the quotation.