Why insulate your attic floor?
The roof is the main source of heat loss in a home. According to studies by IDAE (Institute for Energy Diversification and Saving), up to 30% of your home's heat escapes through the roof when the attic is not properly insulated.
An uninsulated attic acts as a giant thermal bridge: in winter it lets heat escape outside and in summer it allows heat to penetrate the home. This translates into higher heating and air conditioning consumption, which drives up your energy bill.
Insulating the attic floor is the intervention with the best cost-benefit ratio in residential energy efficiency. It is more effective than changing windows and much more economical than insulating facades, as heat naturally rises and accumulates under the roof.
Available insulation techniques
There are two main techniques for insulating a non-habitable attic floor:
Blown insulation (blown mineral wool)
It consists of blowing mineral wool in the form of flakes onto the attic floor using a blowing machine. It is the fastest and most efficient technique, as it adapts to any shape and fills all gaps and corners without leaving thermal bridges.
- Quick installation (2-4 hours for an average attic)
- Adapts to irregular geometries
- No joints or thermal bridges
- Excellent value for money
Blanket insulation (rolls)
Rolls of mineral wool or fiberglass are placed directly on the attic floor. It is a traditional technique that requires a relatively flat and accessible floor.
- Uniform and controlled thickness
- Easy to inspect visually
- Material easy to find
- Suitable for flat floors
At Verdenomia, we primarily use the blown mineral wool technique, as it offers better thermal results and faster, cleaner installation. The recommended thickness is 30-40 cm to achieve a thermal resistance R ≥ 7 m²·K/W.
How much does attic insulation cost?
The usual cost of insulating an attic floor ranges from €20 to €40/m², depending on the technique used, the thickness of the insulation and the accessibility of the space. For an average attic of 60-80 m², this amounts to between €1,200 and €3,200.
However, thanks to the Energy Savings Certificates (CAE) program, this intervention can be 100% free for the homeowner. The CAE fully fund the cost of materials and labor, with no commitment or hidden costs for the customer.
€0 for the homeowner thanks to the CAE program
Energy Savings Certificates (CAE)
Energy Savings Certificates are a mechanism created by the Spanish government to promote energy efficiency. Large energy companies (obligated parties) must demonstrate energy savings, and to do so they fund interventions such as attic insulation in private homes.
How does it work in practice? It's very simple:
- 1Energy companies provide the funds to finance the works.
- 2Specialized companies like Verdenomia carry out the interventions.
- 3In return, certificates are generated that accredit the energy savings achieved.
- 4The homeowner gets professional insulation without paying anything.
This system is beneficial for all parties: energy companies meet their obligations, homes improve their energy efficiency, and society reduces its overall energy consumption.
The step-by-step process
Eligibility check
Check online if your home meets the requirements of the CAE program. You only need a non-habitable attic with adequate access.
Technical diagnosis
A qualified technician visits your home to assess the attic, take measurements and confirm the technical viability of the intervention.
Intervention planning
A date is set for the installation. Our technicians inform you of everything you need to know before the day of the work.
Professional installation
The technical team carries out the insulation in just a few hours, cleanly and without construction work. The result is immediate: better comfort and lower consumption.
Total cost: €0
You pay absolutely nothing. No materials, no labor, no fees. Everything is 100% funded by the CAE.
Concrete benefits of insulation
Energy savings
Reduce your heating bill by up to 30%. With good insulation, you need less energy to keep your home at a comfortable temperature.
Thermal comfort
More stable temperature in all seasons. Less cold in winter and less heat in summer, without drafts or cold spots.
Home value
Improves your property's energy rating, which increases its market value and makes it more attractive to buyers or tenants.
Environmental impact
Less energy consumption means fewer CO₂ emissions. You actively contribute to the fight against climate change from your own home.
Ready to insulate your attic for free?
Check your eligibility in less than 2 minutes and get professional insulation 100% funded by the CAE.
Check my eligibility