What is external wall insulation?
External wall insulation covers all measures used to thermally protect exterior walls from cold and heat. A common solution is an External Wall Insulation System (EWIS), where insulation boards are fixed using insulation fixings and reinforced with reinforcing mesh.
What materials are used for external wall insulation?
Depending on your energy-efficiency target and building requirements, you can choose from a range of insulation materials – from mineral wool and EPS/XPS to eco options such as wood fibre or hemp fibre. Whatever material you choose: for secure fixing and a crack-free finish you need high-quality insulation fixings and reinforcing mesh – that’s exactly what we specialise in at BMSC24.
What makes high-quality external wall insulation?
- low λ-value (thermal conductivity) for maximum energy savings
- vapour-permeable layers to help prevent moisture issues
- fire classes A1/A2 for increased safety
- durable, alkali-resistant reinforcing mesh
- corrosion-resistant insulation fixings with the right plate diameter
How is reinforcing mesh used in external wall insulation?
Reinforcing mesh is embedded into a fresh reinforcement coat (reinforcement mortar). It distributes tensile and shear stresses evenly and helps prevent cracking. Key points:
- embed the mesh fully and don’t let it sit proud
- maintain a 10 cm overlap (approx. 4 in)
- add extra diagonal reinforcement around corners
How are insulation fixings used in external wall insulation?
- Drill through the insulation board and into the substrate.
- Insert the correctly sized fixing so the plate sits flush/recessed.
- Hammer in or screw in the fixing until it is securely anchored.
- Close recesses with insulation cover caps for a smooth surface.
Benefits of insulating external walls
- Save up to 30% on heating energy
- More comfortable indoor climate in both summer and winter
- Increase property value and protect the building fabric
- Meet legal requirements for energy-efficient refurbishment
Insulating a façade – costs & cost-effectiveness
The cost of insulating a façade mainly depends on the insulation material chosen and the workmanship. On average, it is around €90–€180 per m², but it pays back over time through long-term energy savings.
