Understanding the Types of Wall Construction
In the UK, most properties are constructed with either cavity walls or solid walls. Identifying your wall type is the first step in choosing the right insulation, as the method and materials used for insulating each are very different.
- Cavity Walls: Built with two layers (or “skins”) of brick or blockwork with a gap in between.
- Solid Walls: Made from a single solid layer of brick or stone with no internal cavity.
What Is Cavity Wall Insulation?
Cavity wall insulation involves filling the gap between the inner and outer wall layers with an insulating material such as mineral wool, polystyrene beads, or foam. This prevents heat from escaping and helps maintain a stable indoor temperature.
Benefits of Cavity Wall Insulation
- Quick and minimally disruptive to install
- Reduces heating costs by up to £250 per year
- Ideal for homes built after the 1920s
- Improves EPC (Energy Performance Certificate) ratings
What Is Solid Wall Insulation?
Solid wall insulation is more involved. It can be applied either internally using rigid insulation boards (like Celotex PIR boards) or externally with systems that combine insulation and render.
Benefits of Solid Wall Insulation
- Up to 45% reduction in heat loss through walls
- Improves comfort and eliminates cold spots
- Can dramatically improve older property performance
- Ideal for homes built before 1920
Comparison: Cavity Wall vs Solid Wall Insulation
| Feature | Cavity Wall Insulation | Solid Wall Insulation |
|---|---|---|
| Installation Cost | Lower (£300–£700 average) | Higher (£7,000–£15,000) |
| Disruption | Minimal | Moderate to High |
| Best For | Post-1920s homes | Pre-1920 homes or solid wall builds |
| Heat Retention | High | Very High |
| Return on Investment | 3–5 years | 5–10 years |
Which Insulation Should You Choose?
Choosing the right insulation depends on your property’s construction, budget, and energy goals. Cavity wall insulation is ideal for newer homes with accessible cavities, while solid wall insulation provides substantial energy savings for older or heritage homes.
Where to Buy Wall Insulation
At Buy Insulation, we supply high-performance insulation materials suitable for both cavity and solid wall applications. Whether you need mineral wool, PIR boards, or multi-foil insulation, we have the right product for your project.
Ready to Improve Your Home's Energy Efficiency?
Choosing the right wall insulation can cut your energy bills, boost comfort, and even increase your property value. Whether you're a homeowner, builder, or landlord, trust Buy Insulation to help you find the right solution.
Browse our full insulation range today and take the first step toward a warmer, quieter, and more energy-efficient home.
Conclusion
Understanding the difference between cavity wall and solid wall insulation helps ensure you make the best choice for your property. Both offer unique benefits, and with the right products and guidance, you can transform your home's performance, comfort, and long-term efficiency.
