Applications
Polyester geotextile is used in various areas of flat roof waterproofing – from accessible terraces and renovations of existing roofs to targeted sealing of critical details. Choose the appropriate application for your project.
Depending on the application, the requirements for material thickness and roll width differ.
In the following examples, we show how polyester fleece is used in practice – and what is important in this process.
Overview of application areas
Sealing a balcony or terrace without removing the tiles
Renovation of accessible terraces with liquid waterproofing and polyester geotextile – without dismantling existing coverings.
Renovating a flat roof without removing the old bitumen waterproofing
Leaky flat roofs with existing bitumen waterproofing can be specifically repaired without removing the entire roof structure – efficiently, economically and permanently.
Sealing a flat roof under a terrace – without removing the existing waterproofing
For terraces above living spaces, the waterproofing below the usable level can be repaired without dismantling the entire structure – ideal for inversion roofs.
Detailed connections – solutions for critical areas on flat roofs
Localized leaks often occur at connections and penetrations. Targeted reinforcement solutions for inside and outside corners, parapets, roof vents, and roof drains.
Suitable applications for polyester geotextile 110 g/m²
Recommended standard solution for most sealing work:
Sealing and renovation of flat roofs
(New construction, repair and restoration of existing roof surfaces)Flat roof waterproofing without removing the old bitumen sealant
Additional reinforcement of Detailed connections:
Inside and outside corners
Parapet connections
Roof vents / aerators
Roof drains and water inlets
Gutters and transitions
Sealing of foundations and floor slabs
Filter and separation layer for walkways and paved outdoor areas
👉 Proven solution for standard applications
Ideal for precise detail work, repairs and classic flat roof sealing.
Suitable applications: Polyester geotextile 120 g/m²
For all the above-mentioned areas of application and additionally recommended for increased stress:
Highly frequented or mechanically stressed roof surfaces
Projects with increased requirements for:
durability
Crack bridging
long-term sealing reliability
Items with extended warranty or lifetime requirements
👉 More material reserves for maximum safety
Recommended when a particularly durable and resilient seal is desired.
Selection aid
110 g/m² → technically adequate, economical standard solution
120 g/m² polyester fleece → Additional safety margin for demanding applications
Both variants are compatible with common liquid plastic, bitumen and PU sealing systems.
Practical advice
Not every sealing situation is the same.
The choice of suitable geotextile should always be based on Usage, subsurface movement and mechanical stress orient yourself.
👉 If you are unsure, we will gladly help you choose the right solution.
No suitable solution found?
Not every flat roof problem can be clearly assigned to a standard case.
If you have not found a suitable solution for your situation in the application areas shown:
👉 Simply send us a photo of the problem area via email: info@as-baustoffe.com and briefly describe the situation.
Our experts analyze the connection and give you a free, non-binding recommendation for the right sealing solution – including material and construction proposals. This way you receive a technically sound solution, tailored to your specific flat roof detail.
Response usually within 24 hours