Water ingress quickly damages a building. Flat roof, balcony, terrace above a room or buried wall: we identify the source of the problem and have a durable waterproofing carried out by specialised companies.
The works covered
- Waterproofing of flat roofs (bituminous or synthetic membranes, resins)
- Balconies, loggias and terraces above living rooms
- Buried walls and plinths
- Thermal insulation combined with flat roofs
What we check before the works
- The source of the leaks and the condition of the substrate
- Falls, rainwater outlets and upstands
- Roof accessibility (accessible terrace or not)
Regulations and good practice
- Flat-roof waterproofing follows precise professional rules (notably French DTU 43.1).
- These works fall under the ten-year (décennale) guarantee of the company carrying them out: its insurance certificate is provided before signing.
These general rules are confirmed for each project, depending on your home, your commune and the regulations in force at the time of the study.
How does your project work?
- Your request and the appointmentYou describe your project online (pre-study) or by phone. With your agreement, the adviser calls you back to arrange an appointment at your home.
- The full on-site study, free and with no obligationIn your presence: review of the existing situation, access constraints and the technical points of the planned works. If the project makes sense, the adviser presents the partner installer’s detailed offer.
- Time to decideYou can sign at the appointment or take time to think. Once you have agreed, you have the legal 14-day withdrawal period.
- The partner installer’s check visitAfter the withdrawal period, the partner installer visits the site in turn to confirm all the technical points.
- Formalities and any financial aidPlanning or condominium permissions if the works require them, any financial aid and, if needed, a financing application. If an essential approval is refused, the project is cancelled.
- Installation, checks and after-sales serviceOnce all approvals have been obtained, the works are carried out by a qualified partner company with ten-year insurance, then checked with you at handover. The partner installer then provides after-sales service under its own guarantees and those of the manufacturers.
What influences the cost
We do not give prices without a visit: every job is different. The main factors that change the quote are:
- The area and complexity (upstands, outlets, penetrations)
- Any removal of the old waterproofing
- The type of protection (gravel, slabs, accessibility)
Who carries out the installation? Agence IntExt, an Independent Business Manager (VDI Mandataire), advises you, studies your project and coordinates its delivery. The Agency does not carry out the works itself: the installation is entrusted to independent partner installers, selected for their qualifications (RGE, QualiPV, QualiPAC… depending on the solution) and their ten-year (décennale) insurance, so that the installation complies with the standards and regulations in force.
Frequently asked questions
How is the source of a leak found?
Through an on-site examination of upstands, outlets and joints; water often appears far from where it enters.
Can a flat roof be insulated when the waterproofing is redone?
Yes, it is the right time: the insulation is placed under the new waterproofing, after checking the height available at upstands and thresholds.
Works often combined
- RoofingRenovation works
- TerracesRenovation works
- Facade renovationRenovation works
- All our renovation worksInterior and exterior
Let’s talk about your project
Describe your works in a few minutes: an adviser studies your request and suggests the most suitable next step, with no automatic price.