Energy renovations often have another goal that you might not suspect. While they are in principle intended to reduce energy consumption, they have an environmental impact, including reducing the CO2 emissions of the house. And one of the jobs that are producing notable results is the insulation of the attic. Indeed, there is a real correlation between insulating your attic and reducing your home's CO2 emissions.
Insulated attics and reduction in CO2 emissions: how?
When you carry out insulation work on your attic, you improve the airtightness of your interior. Indeed, if your attic is not insulated, there is significant heat loss in the order of 20 to 30% at your roof. You will therefore consume more energy by asking your heating system (oil or gas) to operate at a high speed range. However, by insulating your attic space, you put less strain on your heating thanks to the reduction in heat loss. Therefore, the CO2 emissions from the house are revised downwards because you consume less energy (less fuel oil or gas).
In addition, this reduction in heat loss, and at the same time in CO2 emissions, is reflected in your energy bill. Over a year, you can make significant savings which can be seen in your CO2 account or your ecological bonus.
What is the real saving on the energy bill?
To get a real value for the reduction in CO2 emissions from your home, you can calculate the price per kg of CO2 not emitted. For insulation experts, this is a real indicator of the relationship between the cost of energy renovations and their efficiency.
During attic insulation work, there are many variables to take into account such as the type of insulation used, roof structure, the height of the ceiling, convertible or lost attics, etc. However, average values ??are often used by isolation cost / effectiveness analysts. The savings for insulating lost attic space is around 15 euros per square meter on average (value of CO2 not emitted). In the case of insulation for convertible attics, it is of the order of 20 euros per square meter and can even go up to 150 euros per square meter.
Energy renovation and CO2 emissions: what are the other solutions?
All energy renovation works logically lead to a reduction in CO2 emissions. The insulation of the attic is only a part, not negligible perhaps, but not sufficient for an optimal reduction. For example, bad windows cause heat loss of 15%, poorly insulated walls 20%, and an uninsulated floor loses about 10% of heating heat.
As a general rule, when undertaking renovations for the sake of energy efficiency, the ideal is to do general energy work, from the attic to the floor to the windows (ex: triple glazing) and the walls. The savings made on the reduction of CO2 emissions will quickly pay off the initial investment.