The roof is responsible for 25 to 30% of heat loss in an uninsulated home — more than the walls or windows. Insulating your loft or roof slopes is therefore the most effective single investment for reducing your energy bills. At Toit des Dômes, we master all the insulation techniques used in Auvergne: blown insulation for flat lofts, rigid board insulation under rafters, and external insulation (sarking) that combines a new roof covering with thermal renovation. We also handle flat roof and terrace weatherproofing. Free diagnosis, detailed quote, and support with grant applications (MaPrimeRénov', energy saving certificates).
Roof insulation in Clermont-Ferrand costs between €25 and €100/m² depending on the technique. With grants (MaPrimeRénov', CEE), your out-of-pocket cost can be reduced by 60 to 80%. TOIT DES DÔMES is RGE-certified and handles all grant procedures.
Clear and transparent guidance, from your first call to project completion.
We visit your home to assess current insulation: loft, rafters, roof type (pitched or flat). We use thermal imaging if needed to identify cold bridges and infiltration points. This diagnosis is free and allows us to recommend the most suitable technique for your situation and budget.
You receive a detailed quote including the technique chosen, materials, labour, and timelines. We also simulate the available grants for your project: MaPrimeRénov', energy saving certificates, zero-rate eco-loan. In some cases, grants can cover 60 to 80% of the cost.
Our teams carry out the insulation works following the rules of good practice and the manufacturer's specifications. For flat loft blown insulation, one day is enough. For rafters or sarking, the works may take 2 to 5 days. We carry out a final check with you and take photos of the completed insulation.
At the end of the works, we hand over the technical file (products used, thickness, thermal resistance R) needed for your grant applications. We support you with MaPrimeRénov' and CEE procedures. The 10-year warranty applies to all insulation and weatherproofing work.
The choice of insulation technique depends on the type of loft and your renovation goals. Blown insulation (cellulose wadding or mineral wool) is ideal for flat, accessible lofts: fast, economical, and very effective. It does not require disturbing the existing roof and can be done in a day for a standard house.
If your loft is used as a living space, we insulate under the rafters with rigid panels (polyisocyanurate, phenolic foam) or between and below the rafters with glass or rock wool. For maximum performance and a complete renovation, sarking — external insulation under a new covering — is the most efficient solution, though it involves removing and relaying the roof covering.
A leaking flat roof or terrace is a common problem that must be treated quickly before moisture damages the structure. At Toit des Dômes, we handle all types of flat roof and terrace weatherproofing: modified bitumen membrane (torch-applied), liquid waterproofing (polyurethane, PMMA), and cold-applied self-adhesive systems.
Each technique has its advantages depending on the substrate (concrete, wood), the use of the terrace (walkable, non-walkable, green roof) and the budget. We always start with a diagnosis to identify the origin of the leak and the most suitable treatment — localised repair or full refurbishment.
The roof accounts for 25 to 30% of heat loss in an uninsulated home — more than walls (20-25%) or windows (10-15%). Properly insulating it can reduce your heating bill by 20 to 30% from the first winter. For a house consuming 2,000 euros per year in heating, that is a saving of 400 to 600 euros annually.
The return on investment depends on the technique: 3 to 5 years for flat loft blown insulation (low cost, high efficiency), 5 to 8 years for rafter insulation, 8 to 12 years for sarking (before grants). After grants, these payback periods are significantly shortened. Our free thermal diagnosis gives you a precise estimate of your real savings.
Each service includes the following deliverables.
Every project is unique. We provide a free personalised estimate.
From €25/m²
Indicative price for flat loft blown insulation. Grants can cover 60-80% of the cost. Free personalised estimate.
Answers to your most common questions.
TOIT DES