Heat Loss Through Walls
The table below shows a breakdown of the heat lost through the various surfaces of the 1970's Wimpey house this study is based on. It shows
- Heat loss without insulation. (As it was when the house was first built).
- Heat loss with insulation installed.
- The heat loss expressed as a percentage of the total.
- The annual cost of the heat loss.
With respect to the walls the addition of cavity wall insulation was calculated to
- Reduce the heat loss by 61%
|
|
Heat Loss without insulation.
(W/K)
|
|
Heat Loss with Insulation.
(W/K)
|
|
Improvement
(%)
|
| Roof |
297 (45%) |
|
10 (5%) |
|
97 |
| Walls |
177 (27%) |
|
69 (34%) |
|
61 |
| Doors and Windows |
133 (20%) |
|
86 (42%) |
|
35 |
| Floor |
52 (8%) |
|
40 (20%) |
|
23 |
| Total |
659 |
|
205 |
|
|
| 