Airseal: the solution for energy saving & efficient building
What is air tightness in buildings?
Air tightness describes how well a building limits uncontrolled airflow through unintended gaps, seams and connections. In practice, this means closing weak points where cold outside air can enter and warm indoor air can escape.
For professionals, air tightness is especially important around window frames, façade connections and joints between different construction elements. These areas can affect energy performance, indoor comfort and moisture control if they are not sealed correctly.
The Airseal system is designed to support a layered approach to airtight construction. It helps professionals address air sealing, thermal insulation and external weather protection around window connection details. When these elements work together, the building envelope can perform more consistently across different conditions.
A system approach to air sealing and window frame insulation
Air sealing around window frames is not only about closing visible gaps. A professional window connection often needs to manage several functions at once: air tightness on the inside, thermal insulation within the joint and protection against driving rain on the outside.
The Airseal range supports this approach with complementary products for different areas of the joint. The T620 Airseal Window Tape Interior creates an airtight seal at the internal window connection joint, while the T640 Airseal Window Tape Exterior provides protection against weather exposure while allowing moisture movement where required. P605 Airseal Flexfoam helps insulate the space between the frame and wall, while H670 Airseal Coating helps seal seams and cracks between various substrates.
This system-based approach helps professionals select products according to the role each layer needs to perform, rather than relying on one product to solve every detail.
Bostik’s Airseal system tackles three primary challenges: air tightness, thermal insulation, and protection against driving rain. When these aspects work together seamlessly, they provide an additional advantage: enhanced sound insulation.
What are the benefits of airtight building?
Airseal: a complete system for improving air tightness around critical building joints.
Meet our complete Airseal system!
Bostik's Airseal range offers a variety of products designed to seal joints around window frames, enhancing the airtightness of your home. The system includes seven different tapes, a coating, and flexible PU foam, all designed to address and eliminate weak points in your building's air barrier.
Brochure Airseal system
Read everything you need to know about our Airseal System in the brochure. Inside, you'll find detailed explanations of the principles of the concept, and the key products along with their applications.
The best way to insulate window frames?
Install Bostik's Airseal system products to ensure airtightness around window frames, providing the first layer of defense against heat loss in your home.
Looking to learn how to properly seal joints around window frames, step by step? Check out our detailed knowledge article here:
Technical training for air tightness applications
Correct installation is key to achieving reliable air sealing results. Bostik Academy training helps professionals understand product selection, application methods and good practice for airtight construction details.
Training can support teams working on window frame insulation, airtight tapes, sealing foam and related Airseal system products.
Frequently asked questions
Air tightness is the ability of a building to limit uncontrolled airflow through unintended gaps, seams and joints. It helps reduce heat loss, improve comfort and support energy efficient building.
Window frames are common weak points in the building envelope. Sealing the joint between the frame and the structure helps reduce air leakage and supports better thermal performance.
Yes. Passive house and energy efficient building designs rely on controlled air movement. Improving air tightness helps reduce uncontrolled heat loss and supports a more stable indoor environment.
