Achieving a Uw of 0.79 W/m²K, our Passivhaus Aluclad windows are engineered from a timber core clad in durable aluminium. These windows address heat loss, thermal bridging, and air leakage at the frame level, making them an integral part of any building envelope designed to passive house standard.
Full specification for the Zyle Fenster Aluclad Passivhaus window – for use in passive house certification documentation and project specifications.
| Product guidance – as standard | . |
| Frame | 78 x 108 for Triple Glazed Europa window. Manufactured using mortise and tenon joints, glued and mechanically fixed. |
| Sash | 37 x 108 mm – Standard. |
| Sill projection | 110 mm, 150 mm, 180 mm, 210 mm. |
| Wood moisture content | 12-19% |
| Glazing Beads | Internally beaded. |
| Product specification | . |
| Material | Engineered redwood – Standard. |
| External finish | Polyester powder coating. |
| Glazing | Triple glazed 4 Low-E /18/4/18/4 Low-E – Standard. |
| Perimeter spacer bars | White warm edge perimeter spacer with white warm edge integral spacers – Standard. Silver and Black spacer optional. |
| Internal finish | Three coat spray applied factory finish using water based micro-porous paint/ stain. |
| Colour | White – RAL 9016 – Standard. Any RAL – from RAL classic range. Stain – from TRC stain range. |
| U-value | 0.79 W/m²K. |
The passive house building standard demands exceptional control over heat loss, air leakage, thermal bridging, and energy consumption throughout the building envelope. Windows and doors are among the most thermally vulnerable components in any façade, and achieving passive house certification requires glazing that genuinely meets passive house requirements – not merely approximates them.
Developed in direct response to the growing demand for certified low-energy construction across the Ireland, these windows are cost-effective without compromising on the high levels of insulation and air tightness that passive house design requires. They are equally suited to new-build passive house projects, EnerPHit renovation schemes, and any project targeting energy use and carbon reduction beyond current building regulation standards.
Thermal bridging at the window frame is one of the most common causes of underperformance in otherwise well-insulated buildings. Our Passivhaus window addresses this through careful frame geometry, warm edge spacer bars, and triple glazing with dual Low-E glass – all of which work together to minimise heat transfer at every point in the assembly. The result is a window that contributes measurably and consistently to the building’s overall thermal insulation and energy efficiency performance.
The aluminium exterior finish provides long-term durability and weather resistance, while the engineered timber core maintains a warm, natural internal character. Available across the full RAL classic colour range, these windows can be specified to complement any architectural palette – giving architects and clients both the technical performance of a passive house window and the design flexibility expected of a premium Aluclad product. For projects demanding the highest standards of energy efficiency, this is the specification to consider.
Key questions about our certified Aluclad Passivhaus windows, answered for architects, Passivhaus consultants, and self-build clients.
Contact UsOur Aluclad Passivhaus windows achieve a Uw of 0.79 W/m²K, meeting the thermal performance thresholds required by the German Passivhaus Institute for passive house certification.
Heat loss is reduced through triple glazing with dual Low-E coatings, warm edge spacer bars, a thermally optimised timber frame, and aluminium cladding with thermal breaks – all of which minimise heat transfer and thermal bridging at the frame.
Yes. Specifying high-performance Passivhaus windows with a Uw of 0.79 W/m²K contributes directly to improved Building Energy Ratings by reducing overall energy consumption attributable to fabric heat loss.
Yes. As well as new-build passive house projects, our Passivhaus windows are well suited to EnerPHit renovation schemes where the building envelope is being upgraded to meet passive house requirements in an existing building.
A complete service
from design to installation.
We purchased a combination of Alu-Clad windows, Lift & Slide doors and entrance glazing from Zyle Fenster for our family home.
Every member of the team was knowledgeable, approachable and highly professional. Manufacturing quality is outstanding and the installation was carried out with real attention to detail. Even after completion, they followed up to ensure everything was perfect.
It’s rare to find a company that delivers exactly what they promise. We would happily recommend Zyle Fenster to anyone building or renovating a home.
Seán & Emma R. – County Meath
Our architect specified Reynaers aluminium systems and recommended Zyle Fenster for the supply and installation.
The large glazing panels have completely changed the feel of the house while maintaining excellent thermal comfort throughout the winter. The installers were meticulous and every junction was finished beautifully.
It’s refreshing to work with a company that genuinely cares about delivering a quality result.
Niamh F. – County Clare
We chose Schüco aluminium windows and doors through Zyle Fenster for our contemporary home.
Everything about the experience was professional. From technical advice through to installation, the team demonstrated real expertise. The slim profiles look fantastic and the quality of the finish is exactly what we hoped for.
A premium product installed by a premium company.
David L. – County Waterford
Our conservation project required slim glazing without compromising performance, and Zyle Fenster recommended their vacuum glazed timber sash windows.
The result is outstanding. The traditional appearance has been preserved while the improvement in warmth and noise reduction is remarkable. You simply wouldn’t know they contain such advanced technology.
Excellent communication, excellent installation and an exceptional product.
Michael & Sarah K. – County Kilkenny
Finding authentic timber sash windows that also met modern energy standards wasn’t easy until we found Zyle Fenster.
The finished windows perfectly suit our Victorian home while dramatically improving comfort. They operate beautifully and the attention to detail is outstanding.
The installation team treated our home with great respect and left everything spotless each evening. We have received countless compliments from neighbours.
Margaret C. – Dublin
We wanted a large glazed feature overlooking the garden while still achieving excellent thermal performance. The timber curtain wall supplied by Zyle Fenster exceeded every expectation.
The craftsmanship is remarkable and the amount of natural light it brings into the house is incredible. Our architect was particularly impressed with the technical knowledge and attention to detail shown throughout the design process.
Professional, reliable and extremely high-quality workmanship.
Patrick D. – County Wicklow
Whether you are an architect specifying for a new project, a self-builder planning your custom home, or a developer working to a programme, our team is here to help. Get in touch for technical advice, product information, or to request a quote.
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