Turnkey Green Roof Solutions for Commercial Buildings.
Demetair installs green roofs on existing buildings without structural overload or construction complexity, for property owners, social housing providers, and committed businesses. From audit to delivery, you work with a single point of contact.
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Turnkey Green Roof Solutions for Commercial Buildings.
Demet'air installe des toitures végétalisées sur vos bâtiments existants, sans surcharge structurelle ni complexité de chantier, pour les foncières, bailleurs sociaux et entreprises engagées. De l'audit à la livraison, un seul interlocuteur.
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Your buildings are facing pressures you can no longer ignore
Regulations, climate challenges, and investor expectations are putting increasing pressure on your building assets. Yesterday’s solutions are no longer enough.
Your roofs are overheating
Temperatures can reach 70 to 80°C in summer. Air conditioning systems become overworked, occupants are uncomfortable, and materials age twice as fast. Costs rise every year.
Your drainage systems are overloaded
An impermeable roof sends 90% of rainwater directly into drainage networks. During heavy rainfall events, your buildings are on the front line. Climate change will only make these events more frequent.
Your assets are losing value
ESG, CSRD, and European taxonomy standards mean the environmental performance of your property portfolio has become a key criterion for tenants and investors. Buildings that do not evolve lose attractiveness.
Inaction has a cost
Energy, maintenance, depreciation, compliance. The cost of doing nothing is real — it is simply delayed.
Your roofs are overheating
Temperatures can reach 70 to 80°C in summer. Air conditioning systems become overworked, occupants are uncomfortable, and materials age twice as fast. Costs rise every year.
Your drainage systems are overloaded
An impermeable roof sends 90% of rainwater directly into drainage networks. During heavy rainfall events, your buildings are on the front line. Climate change will only make these events more frequent.
Your assets are losing value
ESG, CSRD, and European taxonomy standards mean the environmental performance of your property portfolio has become a key criterion for tenants and investors. Buildings that do not evolve lose attractiveness.
Inaction has a cost
Energy, maintenance, depreciation, compliance. The cost of doing nothing is real — it is simply delayed.
Our answer: a green roof solution without technical compromise
Where conventional solutions reach their limits, our VGHolz substrate takes over. It is a proprietary, made-in-France substrate designed for existing buildings.
Green roofing made accessible, for new builds and renovations
Most existing buildings are excluded from traditional green roof solutions because they are too heavy or too complex to implement.
Our system enables quick installation, compatible with most flat roofs, without major structural modifications.
→ Simplified installation, controlled timelines, and a project that finally becomes achievable.
A new-generation ultra-light substrate
Load-bearing constraints are the main obstacle to green roofing in renovation projects.
Our ultra-light organic substrate (approx. 40 kg/m³) significantly reduces loads while delivering high performance:
- high rainwater retention
- reduction of rooftop heat peaks
- support for biodiversity
→ A technical solution that finally makes these projects feasible.
A single point of contact for a controlled project
Coordination between the different stakeholders (structure, waterproofing, vegetation) is often a source of complexity and risk.
We manage the entire project:
- load-bearing assessment
- waterproofing work coordination
- installation
- vegetation monitoring
→ A secure, frictionless project with one dedicated contact person.
In short, we remove technical barriers, make the project accessible and easy to implement, and eliminate complexity through a comprehensive approach that delivers : tangible benefits :
Extending
waterproofing lifespan
Contribution to
urban biodiversity
Up to
-10 à -15°C
on rooftops in summer
Up to
90 %
rainwater rétention des eaux pluviales
Valuation
of real estate assets
In short, we remove technical barriers, make the project accessible and easy to implement, and eliminate complexity through a comprehensive approach that delivers : tangible benefits :
Our method
What does a green roof project with Demetair involve?
TECHNICAL AUDIT
Analysis of load-bearing capacity, waterproofing condition, access constraints, and maintenance requirements.
Free and with no obligation.
FEASIBILITY STUDY
Selection of suitable vegetation, substrate thickness, irrigation needs, and budget estimate.
DESIGN & COORDINATION
Site preparation and coordination with waterproofing contractors.
You have one single point of contact.
INSTALLATION
Deployment by our teams or qualified partners.
Deadlines are respected, and building operations continue uninterrupted.
MONITORING & MAINTENANCE
- Vegetation monitoring protocol. Optional annual maintenance available.
Are you an architect or engineering consultancy?
We support specifiers with complete technical documentation: product sheets, installation details, compatibility guidelines, and performance data.
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