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Reynaers Aluminium is launching SlimLine 38 HI+, a new generation of aluminium windows that combine ultra-slim design with exceptional energy performance. The system builds on the success of the stylish SlimLine 38 series and takes it to the next level: passive insulation values in a minimalist steel look. What’s more, low-carbon materials limit the ecological impact and make SlimLine 38 HI+ a future-proof, responsible choice.

Ultra-slim profiles with iconic steel look

SlimLine 38 HI+ retains the refined, slim profiles and recognisable steel look of the SlimLine 38 series, but has been technically optimised for use in passive and energy-efficient buildings. Thanks to the ultra-slim faces, light and transparency remain central, even with large window openings up to 3 metres high.

Private house in Saint-Nicolas © a154 architecten, Boven Yvo, Herweyers

The system is available in all popular SlimLine 38 design variants, Functional, Classic, Cubic and Ferro, and maximises daylight entry for an open, light-filled living experience. As SlimLine 38 HI+ is currently only available for window profiles, the system can be perfectly combined with the flat MasterLine 8 door variants, both inward and outward opening, including the stylish pivot door. For extra peace of mind, burglar-resistant options up to resistance class RC2 are available.

Passive-level performance without compromising on design

Where ultra-slim windows traditionally come with limitations in terms of insulation, SlimLine 38 HI+ breaks that rule. Thanks to a greater system depth than the standard SlimLine 38 solution, the system achieves exceptional thermal performance, with U-values of up to 0.74 W/m²K.

Centre de bien-être Bronn © Klaas Cornelis

This makes SlimLine 38 HI+ suitable for new construction projects with the most stringent energy standards and for passive houses. The system is also compatible with triple glazing, which contributes to both thermal and acoustic comfort.

Efficient and flawless installation

Reynaers Aluminium developed SlimLine 38 HI+ with a view to smooth and reliable production and installation. Glass supports with large ribs provide extra strength without disrupting the slim appearance. Cleverly integrated grooves in the aluminium profiles guarantee optimal drainage and correct positioning of the glass supports.

Because airtightness is crucial for high energy performance, SlimLine 38 HI+ is installed exclusively with concealed hinges, which also simplifies installation.

A future-proof and sustainable window solution

SlimLine 38 HI+ is suitable for sustainable construction and circular design. The system uses 100% recycled insulation bars and a minimal amount of EPDM, resulting in a particularly low embedded carbon footprint.

Thanks to its passive energy levels, the system also contributes to a lower operational CO₂ impact throughout the entire life cycle of the building. This sustainable approach was recently awarded a Cradle to Cradle® Bronze certificate, recognising the innovative and future-oriented nature of the design.

Discover more about SlimLine 38 HI+