To reduce energy bills insulation on external walls is an effective way for homes with solid walls. EWI reduce heat loss by enveloping the building, proving more consistent, stable indoor temperatures. Warmer walls reduce condensation and minimizing thermal bridging reduces the strain on HVAC. Sub-standard installation work can lead to damp and poor performance. Hire professional insulation service to overcome installation complexity.
How External Wall Insulation Reduces Heat Loss?
The solid-walled, Victorian style home of the Miller family was charming but notoriously difficult to heat. Despite spending a fortune on gas every winter, the walls were freezing cold to touch and the house felt damp and cold. Before EWI, they were struggling with high bills. The difference was instant and noticeable after renovation. Besides reduction in electricity bills, the curb appeal and home value also increased. If you are searching for external wall insulation near me, explore our guide to understand how it slashes energy bills.
| Did you know? More than 30% of the energy load is due to heat transmission through exterior walls. |
Here is your guide to cutting your energy consumption through external wall insulation.
- Reduced Thermal Resistance
Enhancing external walls with insulation can reduce heat loss through the building envelop. The Energy Savings Trust estimates up to 40% reduction in energy bills through exterior wall insulation, based on home size, energy usage and insulation levels.
- Creating an Air-Tight Barrier
EWI creates an effective, air-tight barrier (thermal jacket) around the home, that provides more stable and consistent indoor temperatures and better air circulation, reducing the need for constant heating or cooling.
- Minimizing Thermal Bridging
A continuous thermal envelop eliminates gaps where heat escapes. Whether you use mineral wool or rigid foam boards, a single, unbroken layer of EWI, targeting areas like steel beams, balconies or slab edges improves thermal comfort. Materials like polystyrene drastically improves the wall’s R-value reducing thermal bridging and heat loss.
- Reduced Condensation or Dampness
EWI prevents dampness and condensation by keeping internal walls warmer, eliminating cold spots and drafts creates comfortable indoor temperatures, reducing the strain on HVAC. It acts as a protective weather shield. It shifts the dew point outwards, preventing mold, reduced risk of structural dampness, rain penetration.
| Fast Fact: The EPA reports that proper insulation of exterior walls can cut monthly utility bills by up to 15%. |
- Structural Protection
By protecting the building’s structure from heat loss and mold, external wall insulation improves the structural health and longevity of the building and provides excellent sound insulation. A warm and dry building structure provides power savings, recovering the installation costs of EWI.
- Environmental Benefits of External Wall Insulation
- By reducing heat loss of up to 40%, EWI lowers energy consumption and carbon emissions drastically.
- The use of beatheable materials increase the lifespan of the building contributing to less construction waste over time.
- The thicker the insulation material, ideally between 100mm to 150mm, the better the ability of the external insulation to retain heat.
- For homes to achieve high EPC ratings, the external wall insulation should typically provide a U-value (heat-loss rate) of around 0.30 W/m2 K or lower, depending on the wall material and thickness.
| Important factAn Energy Performance Certificate (EPC) rating is a measure of a property’s energy efficiency, graded from A (most efficient) to G (least efficient). Solid wall insulation drastically reduces heat loss, moving homes from lower bands (E,F,G) up to higher (A, B, or C) bands. |
Conclusion
If you want to reduce energy bills insulation on external walls is a great idea. Proper installation creates an air-tight barrier, reducing heat loss an cold spots. Reduced condensation and thermal bridging improves energy efficiency and lowers energy costs and carbon footprint. Hire professionals for proper insulation installation and improve home comfort and value.