15/07/2026
SikaProof® A+ 12 is a high-performance waterproofing membrane based on polyolefin (FPO) technology, specially developed for below-ground waterproofing applications such as foundations and reinforced concrete basement walls.
The system creates a mechanical and chemical bond with concrete, providing permanent adhesion between the membrane and the structure. This unique bonding technology prevents lateral water migration between the membrane and concrete, ensuring long-term protection against groundwater pressure.
Developed by Sika, a global manufacturer of construction chemical solutions, SikaProof® A+ 12 is a reliable waterproofing solution for reinforced concrete structures exposed to underground water and demanding environmental conditions.
SikaProof® A+ 12 is suitable for:
It is especially preferred for projects where groundwater pressure and long-term waterproofing performance are critical.
✔ Dual Bonding Technology Creates a strong mechanical and chemical bond with concrete, preventing water from spreading between the membrane and concrete surface. In case of local damage, water migration is significantly limited.
✔ Flexible Application Options Can be used as both:
✔ High Durability Performance Provides resistance against:
It also offers a tested radon barrier performance.
✔ Fast and Easy Installation Membrane joints can be sealed using cold-applied tapes or thermal welding methods, providing practical installation advantages.
✔ UV and Weather Resistance Provides temporary resistance against external environmental conditions during construction stages.
✔ Crack Bridging Capability Adapts to structural movements and helps maintain long-term waterproofing performance.
✔ Certified Quality CE marked and compliant with EN 13967:2012 requirements.
Total Thickness: 1.75 mmMembrane Thickness: 1.20 mm
Roll Width Options:
Roll Length: 20 m
Colors:
Application Temperature: +5 °C to +45 °CSubstrate Temperature: +5 °C to +60 °C
Below-grade waterproofing is one of the most difficult construction elements to repair after completion. Traditional non-adhered membranes may allow water to travel between the membrane and concrete when damage occurs.
Unlike conventional systems, SikaProof® A+ 12 forms a complete bond with concrete, providing a safer and more durable waterproofing solution.
The system is particularly suitable for:
Its advanced bonding technology, installation flexibility, and certified performance make it an effective solution for modern waterproofing projects.
It is used in basement structures, foundation walls, underground concrete structures, and reinforced concrete systems exposed to water pressure.
It creates both mechanical and chemical adhesion between the membrane and concrete, reducing the risk of lateral water movement.
Yes. The system has tested radon barrier properties and can be used in projects where radon protection is required.
The membrane can be installed before concrete casting or applied afterward with suitable system solutions. Joints are sealed using waterproofing tapes or thermal welding methods.
The membrane is supplied in 1 m or 2 m wide rolls with a standard length of 20 m.
