10/07/2026
Protecting buildings against water is important not only for user comfort but also for preserving the structural system. Selecting the right waterproofing material for areas directly exposed to water, such as roofs, terraces, above-foundation surfaces, and walkable areas, extends the service life of the structure and reduces maintenance costs.
4 mm –10°C APP modified bituminous membrane is a professional waterproofing solution widely preferred in Turkey thanks to its thick structure, high-temperature performance, UV resistance, and flexibility at –10°C.
This membrane is produced from bitumen modified with Atactic Polypropylene (APP) and includes a polyester felt or fiberglass reinforcement layer. APP modification provides high performance, especially in hot climates, and improves resistance against UV radiation.
Its 4 mm thickness provides strong protection against impacts, punctures, and abrasion. The –10°C cold flexibility value allows reliable use in moderate and moderately cold climate regions.
Thickness: 4 mm
Cold Flexibility: –10°C
Modification Type: APP (Atactic Polypropylene)
Reinforcement Layer: Polyester felt (high strength) or fiberglass mat (economical option)
Surface Options: Polyethylene film, mineral coating, or sand-coated surface
Application Method: Torch-applied installation
Terrace Roofs: Used under protective concrete layers or as exposed applications with mineral-coated surfaces.
Above-Foundation Waterproofing: Provides a long-term waterproofing solution under protective concrete layers.
Pitched Roofs: Provides reliable performance in hot climates thanks to its UV resistance.
Garden Terraces: Provides effective waterproofing for walkable areas.
Industrial Buildings: Preferred for large surfaces and areas requiring high durability.
High Mechanical Resistance: The 4 mm thickness provides strong protection against impacts and tearing.
Versatile Application: Suitable for both roofing and above-foundation waterproofing applications.
UV Resistance: APP modification provides high resistance against sunlight exposure.
Climate Compatibility: With –10°C cold flexibility performance, it can be used in most regions of Turkey.
Long Service Life: With proper installation and protection, it can provide performance for up to 15 years.
Surface Preparation: The application area must be clean, dry, and smooth before installation.
Primer Application: Using a bituminous primer improves adhesion strength.
Overlap Distance: A minimum 10 cm overlap should be applied at membrane joints.
Protection Layer: Protective concrete should always be used for above-foundation applications.
Where is 4 mm –10°C APP modified bituminous membrane used?
It can be safely applied on roofs, terraces, above-foundation surfaces, and walkable areas.
What is the advantage of APP modification?
It helps the membrane maintain its shape under hot weather conditions and provides resistance against UV radiation.
Is it suitable for foundation waterproofing?
It can be used for above-foundation applications. For below-ground applications, SBS modified membranes with better low-temperature flexibility are generally recommended.
What is the average service life?
With proper installation and suitable protection, it can provide reliable performance for approximately 12–15 years.
4 mm –10°C APP modified bituminous membrane offers a durable and reliable waterproofing solution with its strong mechanical resistance, UV protection, and climate compatibility. It is an effective choice for modern roofing, terrace, and structural waterproofing applications where long-term performance is required.
