Inverted roof
Inverted roof thermal insulation that protects the waterproofing layer
In inverted roof insulation the waterproofing layer sits below the insulation, protected from UV, thermal shock and mechanical stress.
Problem
Roof waterproofing wears faster when fully exposed
Sun, major temperature changes and roof use strain exposed waterproofing layers. The inverted roof build-up keeps waterproofing lower and protected.
Where it is usedAccessible roofsWith slabs, gravel or another protective final layer. Exposed terracesWhere the membrane benefits from UV and thermal shock protection. Maintainable systemsWhen future inspection access and practical upkeep are required.
Roofs that need protected membrane and practical maintenance
The solution is useful on exposed terraces, accessible roofs and cases where waterproofing should be protected below insulation and a final layer.
SystemMembrane protectionWaterproofing remains more protected from UV, thermal fatigue and mechanical wear. Energy performanceThe roof gains an insulation layer with reduced losses and improved comfort. Suitable for accessIt can be designed with a final layer that allows inspection and use.
Waterproofing below, insulation and final protection above
Application includes substrate preparation, waterproofing layer, check before covering, XPS or compatible insulation boards, geotextile where required and final protection with gravel, slabs or another solution.
Process
Check, cover and final protection in the correct order
An inverted system requires discipline in work sequence and in the protection of drains and details.
- AssessmentSubstrate, slopes, parapets, drains, existing layers and roof use are checked.
- WaterproofingThe suitable waterproofing layer is applied with care around joints and upturns.
- Check before coveringSystem continuity is confirmed before insulation is installed.
- Insulation and protectionBoards, geotextile or final layer are installed according to roof use.
FAQ
Inverted roof insulation FAQ
The choice depends on roof use, existing layers and the need to protect the membrane.
Why is XPS often used?
XPS is often selected because it has low water absorption and performs better above waterproofing when the system is correctly designed.
Can the roof be accessible?
Yes, if the final layer, loads, drains and future inspection access are properly planned.
Next step
Considering inverted roof insulation?
Send roof use, photos, existing layers and whether the roof must be accessible. We will propose the suitable layer sequence.