Energy prices are going up again! Developing your home insulation is good for the environment and for your pocket. It is generally quoted that a third of our energy expenditure is wasted.
Where does the heat go?
According to the national Insulation Association;
- 25% heat loss is through the loft/roof space
- 66% through uninsulated solid walls, 33% through uninsulated cavity walls
- 20% through windows and doors
What can you save?
The Energy Savings Trust gives the following figures;
- Insulating under the floorboards on the ground floor will save about $56 – $77 a year
- For an average semi-detached; going from nothing to 270mm will save $198 per year. Increasing from 120mm to 270mm will save $21
- Cavity wall insulation on a detached house will save about $387 per year
- A-rated double glazing will save about $140 per year for a semi-detached
- Draught-proofing can save $50 per year
Easiest wins
Draught-proofing is relatively cheap and easy to install
Installing or increasing loft insulation is straightforward and within the capability of competent DIY-ers. To maintain storage space, spacers to lift the floor are available. Most downlighters will not be covered, ask professional advice. Apply insulation around and over water tanks, not beneath.
Cavity wall insulation can pay for itself in about 4 years. It is important to use a competent registered installer with a long externally backed guarantee.
Other Options
Insulation can be added internally or externally to solid-walled property. Both are more disruptive and will have visual consequences. The cost is significantly higher than cavity fill but the resulting saving will be higher.
For flat roofs and inaccessible roof spaces, there are different options, all require professional installation.
Replacement windows save on maintenance and reduce condensation similarly as saving energy.
Grants
From time to time grants are available to both homeowners and landlords with consequent reductions to pay back periods.
Improving insulation also increases your comfort, and the house will not be so cold when you unexpectedly come home late.