External window sill seal

External window sill seals are a crucial component for the functionality and durability of windows. They form the transition between the window frame and the window sill and reliably prevent moisture, driving rain or condensation from penetrating the structure. At the same time, they contribute to energy efficiency by reducing heat loss and preventing thermal bridges. A correctly fitted window sill seal protects not only the windows but also the adjacent façade from weather-related damage.

Material: TPE

Our seals are made from high-quality TPE (thermoplastic elastomer, 60 ShA). This material combines flexibility with dimensional stability and offers impressive resilience. TPE is weather- and UV-resistant, remains reliably elastic even at fluctuating temperatures, and thus ensures a secure seal over the long term.

Colours and custom colours

Available in the standard colours black, white, brown, grey, beige and transparent, the seals can be discreetly integrated into the appearance of modern windows. From a production quantity of 200 metres, almost any custom RAL colour is also available to meet individual design requirements.

Window sill seal variants

In addition to the standard versions, a double-strand variant is available for selected models. This allows for particularly efficient installation, as two seals can be fitted simultaneously – ideal for larger projects or mass production.

Notes on use

During installation, ensure that the contact surfaces are clean, dry and free from residues. Precise positioning is crucial to ensure rainwater runs off properly and to prevent moisture damage. Regular visual inspections for wear or damage will further extend the service life.

GfA – Expertise in sealing technology

With over 5,490 standard profiles, in-house toolmaking, 17 extrusion lines and state-of-the-art rapid prototyping, GfA offers a comprehensive range of window and façade seals. Made in Germany stands for precision, consistently high quality and reliable availability.

Advantages at a glance:

• Specially designed for external window sills
• Material: TPE (60 ShA), durable and weather-resistant
• Colours: window grey, black, white – custom colours available from 200 m
• Variant: Double-strand on selected models
• Easy installation, long service life
• Quality Made in Germany

With GfA window sill seals, you can rely on safety, precision and sustainability – for windows and façades that remain protected over the long term.