We provide two options for joinery inserts, Giving you optimal insulation ideal for double-glazed windows.



Insert joinery is a method of upgrading existing windows by installing new frames within the original structure. Insert joinery refers to the middle frame of the window which holds the glass in place, rather than the outer structural frame of the window. This process is a cost efficient way to improve insulation without the disruption of a full replacement.

Aluminum Joinery
Windows and doors play a crucial role in the heat transfer of insulated buildings, often accounting for a significant loss or gain of heat. With thermal break, we significantly reduce heat transfer from the interior to the exterior of the building. This means homes with thermally broken joinery are more energy-efficient compared to those fitted with timber or standard aluminium joinery.



Thermally broken aluminum joinery offers a high-performance solution for improving the energy efficiency of your home. A thermal break consists of a barrier of non-metallic material – between the interior and exterior of the frame, it effectively reduces heat transfer, preventing heat loss in the winter and keeping interiors cooler in the summer. This innovative technology enhances insulation, leading to lower energy costs and improved comfort. Our joinery is not only built to withstand New Zealand’s diverse weather conditions but is also durable, resistant to corrosion, and designed with aesthetic appeal in mind. It’s the perfect choice for those seeking an energy-efficient and long-lasting window.

✔ Improved Energy Efficiency
✔ Enhanced Insulation
✔ Condensation Prevention
✔ Durability and Longevity
✔ Noise Reduction
✔ Sleek, Modern Aesthetic
✔ Eco-Friendly
uPVC Joinery


Stärke Ambiance inline windows are designed to create homes that are warmer, quieter, safer, and healthier. An alternative to aluminum windows. With dramatic thermal performance, these windows offer better insulation and significantly reducing your heating and cooling bills. With STARKE thermal modeling, you can precisely determine how your new home will perform, for a more comfortable, efficient, and secure home.







