Aluminium exterior door L527 made to order

High-performance exterior aluminium door with exceptional thermal insulation (Ud 0.85 W/m²K), engineered for energy-efficient buildings. Robust 92 mm profile with triple sealing system ensures durability and year-round comfort.

The L527 exterior aluminium door represents a high-technology solution for building projects prioritizing energy performance. With a system depth of 92 mm and optimized profile geometry, it integrates seamlessly into buildings with strict thermal insulation requirements and contemporary aesthetics.

The 3 mm aluminium profile is reinforced with an articulated thermal break of 34 mm—an essential feature that prevents thermal bridging and significantly reduces heat loss. The 80 mm frame depth ensures stable, secure installation, while the 92 mm door leaf provides rigidity and resistance to deformation caused by temperature variations and wind pressure.

The glazing system features four panes—a dual triplex configuration (44.1 mm + 5 mm Satinato + 44.1 mm)—delivering superior sound insulation and maximum light control. The thermal transmission coefficient Ud of 0.85 W/m²K, certified by ift Rosenheim, places this door among elite performers for energy efficiency. Triple EPDM gasket sealing around the entire perimeter ensures flawless water and air tightness, eliminating unwanted infiltration.

Standard dimensions up to 1100 × 2300 mm, with capability to reach 1200 × 2500 mm for a single leaf, provide design flexibility. The door adapts easily to various installation types and opening configurations, compatible with modern automation systems.

Recommended for modern residences, commercial and institutional buildings focused on reduced energy consumption, L527 fits perfectly into minimalist and contemporary interiors, combining flawless functionality with discrete, elegant presence.

This L527 model achieves a thermal coefficient of 0.85 W/m²K, verified by ift Rosenheim, positioning it among the highest-performing exterior doors. The exceptional insulation is delivered by an articulated thermal break of 34 mm and quadruple glazing (44.1 triplex + 5 mm satin + 44.1 triplex), significantly reducing heat loss and maintaining interior comfort. The investment in premium thermal performance pays for itself through measurable energy savings over 5–7 years.

The door features three EPDM gaskets positioned along the frame perimeter, creating multiple barriers against water and air infiltration in harsh weather. EPDM rubber remains elastic and UV-resistant for 15–20 years, maintaining sealing integrity without degradation. The 92 mm system depth and engineered frame geometry ensure effective water drainage away from the structure, preventing moisture penetration and internal water damage.

Standard dimensions go up to 1100×2300 mm, and for single-leaf configurations, up to 1200×2500 mm. These cover the vast majority of residential and commercial installations. If your opening requires custom dimensions, our sales team can arrange made-to-order production with detailed specifications and dedicated timelines — contact us with your architectural drawings and site measurements.

Installation is straightforward into existing frames for standard-sized openings with plumb walls. The 80 mm frame depth accommodates most modern construction. If the existing frame is damaged or not square, partial replacement with insulation-grade materials is recommended to maintain sealing performance. Professional installation ensures perfect alignment and leveling, which is critical for thermal performance and proper operation.

The L527 features a 3 mm aluminum profile with an articulated 34 mm thermal break made from high-grade polymer, ensuring structural durability while maintaining thermal isolation. The 92 mm leaf thickness provides both mechanical strength and thermal resistance. Aluminum is inherently corrosion-resistant and requires minimal maintenance — annual washing with mild soap and water suffices in most climates. The thermal break prevents thermal stress-induced warping, extending the door's operational lifespan to 25+ years.

Security specifications including RC-class rating, lockset type, and reinforcement details are customized during the quotation phase. We recommend discussing your specific security needs with our team to determine whether RC2 or RC3 certification is appropriate for your location and risk profile. The standard configuration includes premium hardware and multi-point locking mechanisms; additional security enhancements can be integrated upon request.