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Inward-opening aluminium-clad windows are designed for commercial and multi-storey buildings where internal access for cleaning and maintenance is required. Suitable for offices, hotels, mixed-use developments and high-density urban sites with limited external access.
Operation and Maintenance
The inward-opening sash allows safe cleaning and maintenance from inside the building, eliminates the need for external access equipment such as scaffolding or MEWPs, and supports reduced operational and lifecycle maintenance costs
Acoustic Performance
Acoustic insulation performance up to 45 dB (following the BS EN ISO 10140-2 : 2010), suitable for buildings exposed to traffic, transport infrastructure, or urban noise. Enhances internal comfort in commercial working and living environments.
Thermal Performance
Thermal transmittance (Uw) as low as 0.8 W/m²K, contributing to improved energy efficiency and reduced heating demand, and supporting compliance with current building regulations and sustainability targets.
Product Guidance
| Operation | The window is of a tilt-and-turn configuration, providing inward tilting for controlled ventilation and full inward opening for safe and convenient cleaning, emergency egress, and rapid ventilation |
| Timber Species | Manufactured from selected engineered laminated pine or hardwood, sourced from sustainably managed forests and certified to FSC® or PEFC standards |
| Moisture Content | 12% +/- 2% on delivery |
| Glass & Glazing | Drained and ventilated wet-glazed system. Windows are factory-fitted with sealed insulating glazing units, 24mm or 48mm thick, in double- or triple-glazed configurations. Glazing units are manufactured in accordance with EN 1279. Glass unit make-up is as follows (from external to internal): Double glazing: 4mm float glass / 18mm argon-filled cavity / 4mm float glass with super low-emissivity (Low-E) coating. Triple glazing: 4mm float glass / 18mm argon-filled cavity / 4mm float glass / 18mm argon-filled cavity / 4mm float glass with super low-emissivity (Low-E) coating. Alternative glazing configurations, including insulated infill panels, are available on request up to a maximum overall unit thickness of 48mm |
| Glazing Bars | Applied glazing bars are used to replicate the slim profiles of traditional glazing bars. Bars are fixed to both faces of the sealed glazing unit using high-performance double-sided glazing tape and finished with a clear silicone. |
| Ironmongery | Single-handle tilt-and-turn operation incorporating a Siegenia multi-point hinged locking mechanism. Available with exposed or concealed hinges, and with locking or non-locking handle options |
| Cill | Aluminium Extensions 50mm, 70mm, 110mm, 180m, 210mm |
| Ventilation | Windows may be fitted with an adjustable, draught-proof ventilator providing a specified equivalent area, available on request. Ventilators are discreetly integrated within the window frame. |
| Finish as Delivered | Window supplied factory finished, externally and internally with Teknos Water-based micro porous opaque to specified RAL colour, or stained finish. Aqua prime 1410, Aqua mid-2901, Aqua top 2600. External aluminium cladding finished in polyester powder coating to Qualicoat Class 1 as standard. Qualicoat Class 2 finish available on request |
| Restrictors | Restrictors which allow the opening of the sash to be restricted to 100mm is an option |
| Fixing | Installation to be carried out using best building practices and in conjunction with recommendations of TRC windows |
| Warranty | A 10-year manufacturer’s guarantee is provided covering defects in materials and workmanship to frames, ironmongery, and sealed glazing units, subject to compliance with the manufacturer’s standard installation and maintenance requirements |
| Frame & Sash | Window profiles measure 78mm × 78mm for double-glazed units and 92mm × 92mm for triple-glazed units. Frames are fabricated using traditional mortise-and-tenon joints, secured with adhesive and mechanical fixings to ensure structural integrity. |
| Glazing Beads | Windows designed as internally beaded, permitting the installation and replacement of glazing units from the internal side. Beading design maintains the integrity of the frame, provide appropriate security against unauthorised removal, and allow safe and efficient maintenance or replacement of glass without disturbing the external façade. |
| Child Restrictors | Windows can be fitted with optional restrictors to limit sash opening to 100mm, providing controlled ventilation while enhancing occupant safety, particularly in areas subject to regulatory or user safety requirements |
Specifications
| Air Permeability | 600 Pa (Class 4) | EN 12207:2017 |
| Water Tightness | 600 Pa (Class 9A) | EN 12208:2002 |
| Wind Resistance | 2000 Pa (Class 5C) | EN 12210:2016 |
| UK exposure category | To BS 6375-1, 2000 Pa. | |
| Whole Window U-Value | Thermal performance is calculated by the standards of EN ISO 10077-1:2006 and achieves a U-value of 0.8 -1.2 W/m²K depending on the type of glass unit. | |
| Whole Window Acoustic rating Rw, dB | Acoustic rating is Laboratory tested to BS EN ISO 10140-2: 2010 (Airborne Sound Insulation). Window Acoustic ratings Rw 31-45dB. | |
| Solar energy transmittance, g-value | Solar heat gain coefficient g 0.27 to 0.63 depending on glass unit make up | |
| Visible Light Transmittance, LT | Light transmittance LT 0.46-0.82 depending on glass unit make up | |
| Anticipated Life Expectancy | 60 years with regular maintenance |
Technical Drawings
Safe inward-opening operation for urban and high-rise applications
High acoustic and thermal performance
Durable, low-maintenance external finish
Suitable for commercial asset management and long-term performance requirements
Performance, Durability, and Application
Operation and Maintenance
The inward-opening sash allows safe cleaning and maintenance from inside the building, eliminates the need for external access equipment such as scaffolding or MEWPs, and supports reduced operational and lifecycle maintenance costs
Acoustic Performance
Acoustic insulation performance up to 45 dB (following the BS EN ISO 10140-2 : 2010), suitable for buildings exposed to traffic, transport infrastructure, or urban noise. Enhances internal comfort in commercial working and living environments.
Thermal Performance
Thermal transmittance (Uw) as low as 0.8 W/m²K, contributing to improved energy efficiency and reduced heating demand, and supporting compliance with current building regulations and sustainability targets.
Materials and Construction
Typical Uses
Thermal, Acoustic, and Maintenance Excellence
Our Alu-clad tilt and turn windows are engineered to deliver superior operational efficiency and internal comfort. The innovative inward-opening sash design ensures that cleaning and maintenance can be conducted safely from within the building, completely removing the requirement for costly external access equipment like scaffolding or MEWPs. This functionality significantly lowers long-term lifecycle maintenance costs.
Furthermore, with acoustic insulation reaching up to 45 dB, these units effectively mitigate urban and transport noise. Combined with exceptional thermal transmittance as low as 0.8 W/m²K, our windows support stringent sustainability targets and building regulations while drastically reducing heating demand.
Premium Construction Tailored for Modern Multi-Storey Developments
Combining the resilience of modern materials with timeless aesthetics, our Alu-clad windows feature a durable aluminium exterior and a refined timber interior. The external cladding provides formidable weather resistance and a low-maintenance finish, shielding the timber core to extend the window’s service life significantly. This hybrid construction offers the perfect balance of structural longevity and interior warmth.
These versatile units are the ideal specification for high-density urban environments, including multi-storey residential blocks, commercial office buildings, and premium hotels. Whether for mixed-use developments or serviced apartments, they provide a sophisticated, long-lasting solution for any large-scale project.
Explore our portfolio of successful installations showcasing the versatility and finish of our alu-clad Inward opening Tilt & Turn window range.
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