External Wall Insulation - A Viable Option to Improve Energy Efficiency of Buildings

With growing concerns about energy usage and carbon emissions, external wall insulation is emerging as a popular choice for improving the energy efficiency of buildings. By applying insulation boards to the outer walls, external wall insulation helps reduce heating and cooling costs while also providing several other benefits. In this article, we will take a closer look at external wall insulation, its advantages, installation process and factors to consider.


There are different types of insulation boards available for external wall insulation depending on the material used:

EPS (Expanded Polystyrene) Boards: EPS boards are one of the most commonly used insulation materials. They are lightweight, water resistant and have high insulation properties.

MW (Mineral Wool) Boards: Made from basalt or slag wool, MW boards offer good durability and fire resistance along with insulation. They can be used for retrofitting older buildings.

XPS (Extruded Polystyrene) Boards: XPS boards have enhanced properties compared to EPS like higher resistance to moisture. However, they are more expensive.

PIR (Polyisocyanurate) Boards: With highest thermal resistance, PIR boards require the least thickness but come at a premium price. They are suitable for projects requiring maximum energy efficiency.

Sheep Wool Boards: Natural insulation materials like sheep wool provide breathability and fire resistance along with insulating properties and are gaining popularity in eco-friendly construction.

Key Advantages of External Wall Insulation
External Wall Insulation Board applied to building facades ensures that heat from inside is retained during winter while preventing overheating during summer. Some other key advantages are:

- Improved Energy Efficiency: With external wall insulation, heating and cooling loads are significantly reduced leading to lower utility bills.

- Thermal Comfort: Rooms feel warmer in winters and remain cooler during summers improving indoor comfort levels.

- Noise Reduction: Insulation helps attenuate external noise for a quieter indoor environment.

- Protection from Moisture: Insulation boards prevent penetration of moisture improving the building envelope.

- Fire Safety: Certain insulation boards offer fire protection which is critical for structures.

- Facade Aesthetics: A wide variety of insulation boards and external finishes are available to enhance curb appeal.

Preparation and Installation Process
Here are the typical steps involved in external wall insulation installation:

1. Surface Preparation: The wall surfaces are cleaned, repaired if needed and a bonding agent applied.

2. Fixing Insulation Boards: Rigid insulation boards are adhered to the walls using adhesives or mechanical fixings. Joints are taped for continuity.

3. Installing Base Coat: A reinforcing base plaster coat is applied over the boards for a leveled surface.

4. Applying Primer: A primer coat is applied to facilitate adhesion of the final texture.

5. Finishing Layer: A texture coat or cladding like plaster, wood panels etc. is installed as the external finishing.

Factors to Consider
Some key factors to consider for effective external wall insulation include wall condition assessment, choosing the right insulation grade, ventilation requirements, presence of pipes or cables, fire safety certification and local building regulations. Professional installation ensures long term performance.

With increasing stringency of energy codes, external wall insulation is becoming an essential part of new construction as well as building renovations. It delivers substantial energy savings along with improved indoor comfort and aesthetics. When planned and applied correctly using suitable materials, external insulation is a cost-effective solution to enhance building energy efficiency.

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