Recommended
200008
Ceresit CT84 - Express PU Foam adhesive for EPS - 850ml
What is Ceresit CT 84 Express?
Ceresit CT 180 is a high-performance Polyurethane (PU) Adhesive used for fixing External Wall Insulation (EWI) boards, including EPS, XPS, and Mineral Wool. It is an "Express" solution that allows for mechanical anchoring just 2 hours after application, compared to 24–48 hours for cement-based adhesives. It is specifically designed for use in low temperatures and high humidity where traditional mortars fail to set.
| Technical Specification | Value / Detail |
|---|---|
| Material Base | Single-component Polyurethane |
| Setting Time | Approx. 2 hours (ready for pinning) |
| Temperature Range | -10°C to +40°C |
| Coverage | Approx. 6m² to 10m² per 850ml can |
| Thermal Conductivity | 0.035 W/mK (Eliminates thermal bridges) |
| Expansion | Low-expansion (High precision) |
| Compatibility | EPS, XPS, Mineral Wool, Wood, Metal, Bitumen |
- Can Ceresit CT 84 be used in freezing temperatures?
Yes. Unlike cement-based adhesives that cannot be used below 5°C, Ceresit CT 84 can be applied in temperatures as low as -10°C. This makes it the essential choice for winter rendering and insulation projects in the UK. - Is CT 84 better than cement adhesive for EWI?
CT 84 is significantly faster and more thermally efficient. Because it is a foam-based adhesive, it has a thermal conductivity similar to the insulation itself, which eliminates thermal bridging at the joints. It also reduces the weight load on the facade and requires no water or mixing on-site. - How do I apply Ceresit CT 84 to insulation boards?
Apply a bead of the PU adhesive (approx. 20mm diameter) around the perimeter of the board with a 2cm gap from the edge, and one vertical strip through the center. Wait 2–4 minutes before pressing the board against the wall to allow for initial expansion.
- Preparation: Shake the can vigorously for 30 seconds and screw it onto a professional PU foam gun.
- Application: Apply a perimeter bead and a central strip to the insulation board.
- Wait Period: Wait for 2 to 4 minutes (the "flash-off" time) before placing the board on the wall.
- Fixing: Press the board firmly. You have approximately 10 minutes to make minor adjustments to the board's level.
- Anchoring: After just 2 hours, the boards are securely fixed and ready for mechanical fixings and basecoating.
- Pro-Tip on Productivity: One box of CT 84 (12 cans) replaces approximately 300kg of cement adhesive. This significantly reduces transportation costs and the physical labor of mixing bags on-site.
- Pro-Tip for Renovation: CT 84 has excellent adhesion to difficult substrates like bitumen, wood, and metal, making it the best choice for upgrading insulation on existing flat roofs or modular timber-frame buildings.