Un-insulated external walls are responsible for 35% of your home’s heat losses. Here’s what you can do to reduce heat loss through your walls!
Wallrock Thermal Liner
You can insulate your house internally by adding Wallrock thermal liner sheets to the internal walls. Generally, in common internal wall insulation methods you need to clear out the space for a few days. Moreover, internal insulation reduces the area of your rooms. However, unlike other internal wall insulation processes wall rock thermal liner can be applied easily and fast to your walls without bothers you at all. There are 3 main categories of wallrock insulation included:
- Wallrock thermal liner
- Wallrock KV600 thermal liner
- Wallrock fiberliner
By adding 3 mm of Wallrock thermal liner in an un-insulated solid wall you reduce the u-value of the wall from 2.14W/m²K to 1.82W/m²K. The BBA certificate for Wallrock Thermal Liner states an R-value of 0.0821 Km2/W. Wallrock KV600 thermal liner performs even better due to its higher thickness of 4mm and improved thermal conductivity. If you want to have even better thermal performance and nicer finish it is very common to apply Wallrock fiberliner above Wallrock KV600 thermal liner. The wall surface becomes more durable and then you can paint it as normal.
Uninsulated solid wall
| Layers | Thickness (m) | Conductivity (W/mK) | Resistance (Km²/W) |
| Internal surface | – | – | 0.12 |
| Plasterboard | 0.016 | 0.20 | 0.08 |
| 250 mm Brick | 0.250 | 1.2 | 0.21 |
| External surface | – | – | 0.06 |
| Sum | 0.027 | – | 0.47 |
| U value (W/m²K) | 2.14 | ||
Wallrock thermal liner
| Layers | Thickness (m) | Conductivity (W/mK) | Resistance (Km²/W) |
| Internal surface | – | – | 0.12 |
| 4 mm Wallrock thermal liner | 0.004 | 0.05 | 0.0821 |
| Plasterboard | 0.016 | 0.20 | 0.08 |
| 250 mm Brick | 0.125 | 1.2 | 0.10 |
| External surface | – | – | 0.06 |
| Sum | 0.027 | – | 0.55 |
| U value (W/m²K) | 1.82 | ||
External Wall Insulation
The best and the most efficient way to reduce heat losses is to add external wall insulation to your walls. Unlike the previous options EWI is more expensive than adding wallrock thermal liner internally or secondary glazing. However, the benefits of EWI are well know and it is superfluous praising it further. You can find more information about EWI in the next blog:
<<7 REASONS TO INSULATE YOUR HOME>>
By adding 100 mm of Expanded polystyrene to an un-insulated solid wall you can reduce the u-value of the wall from 2.14 W/m²K to 0.28 W/m²K. This will result reduced heat losses from your house and increased savings in your energy bills. You can learn more about u-values and their effect on the heat losses in the next blog:
<<Demystifying U-values and their effect on the heating demand of your house>>
Un-insulated solid wall
| Layers | Thickness (m) | Conductivity (W/mK) | Resistance (Km²/W) |
| Internal surface | – | – | 0.12 |
| Plasterboard | 0.016 | 0.20 | 0.08 |
| 250 mm Brick | 0.250 | 1.2 | 0.21 |
| External surface | – | – | 0.06 |
| Sum | 0.027 | – | 0.47 |
| U value (W/m²K) | 2.14 | ||
Expanded Polystyrene insulation (EPS)
| Layers | Thickness (m) | Conductivity (W/mK) | Resistance (Km²/W) |
| Internal surface | – | – | 0.12 |
| 250 mm Brick | 0.250 | 1.2 | 0.21 |
| 100mm EPS | 0.100 | 0.032 | 3.13 |
| External surface | – | – | 0.06 |
| Sum | 0.340 | – | 3.51 |
| U value (W/m²K) | 0.28 | ||