Expanded Polystyrene (EPS) is one of the most popular insulation materials used in Ireland. It’s lightweight, efficient, and cost-effective — but only when installed correctly.
At Deco Stones, we not only provide expert advice but also stock professional products that make insulation work easier and long-lasting. Here’s our step-by-step guide with recommended solutions from our range.
Before installation, the wall must be clean, stable, and dry:
Recommended product:
Ceresit CT16 Primer (15 kg) – prepares walls for optimal adhesion of EPS boards and base coats.
Selecting the correct adhesive is crucial for a durable installation. We recommend:
Ceresit ZU 2in1 Adhesive and Base Coat (Grey, 25 kg)
A professional 2-in-1 solution that works as both adhesive and base coat for embedding fiberglass mesh.
Ceresit CT84 Express Foam Adhesive
Fast and efficient foam adhesive for EPS and mineral wool. Ideal for quick installations, even in cold conditions.
Both are moisture-resistant and suited for Irish conditions.
Two main methods:
Perimeter and Dabs Method (recommended) – Apply adhesive along the edges and 3–6 dabs in the centre (~40% coverage).
Full-Surface Method (for smooth walls) – Spread adhesive evenly with a notched trowel.
Tip: Use CT84 foam adhesive for speedier installations.
Start from the bottom and work upwards.
Place boards tightly without gaps.
Stagger joints in a brick-bond pattern for stability.
Press firmly and remove excess adhesive to avoid thermal bridges.
Recommended product:
Plastic Fixings for EPS & Wool (100 pcs) – ensure secure mechanical anchoring. Use 4–6 fixings per board depending on wall type and wind load.
After boards are glued and mechanically fixed:
Apply a thin layer of Ceresit ZU 2in1 Adhesive.
Embed Fiberglass Mesh 160 g, 50 sqm into the fresh layer.
Smooth the surface and apply a second coat of adhesive.
Once cured, finish with decorative render or paint.
Recommended finishing product:
Ceresit CT76 Silicone Render 1.5 mm (25 kg) – durable, flexible, weather-resistant, and protects against algae and dirt.
This creates a strong, protective barrier that guarantees thermal efficiency and a professional aesthetic.
For Irish homes, we suggest using a complete system:
Ceresit CT16 Primer – prepare the wall
Ceresit ZU 2in1 Adhesive – adhesion + base coat
Ceresit CT84 Foam Adhesive – fast EPS installation
Plastic Fixings – secure mechanical anchoring
Fiberglass Mesh 160 g – reinforcement
Ceresit CT76 Silicone Render – finishing layer
Combined with proper installation techniques, these products ensure a warm, energy-efficient, and long-lasting home.
Correctly gluing EPS insulation boards is the foundation of effective thermal protection. With the right preparation, adhesives, fixings, mesh, and finishing render, your insulation will perform perfectly in Irish weather.
Explore our full range of External Wall Insulation Systems at Deco Stones Ireland – and let us help you build a warmer, more energy-efficient home.
