Explore our precision-fabricated aluminum, thermal break, and composite joinery series configured for rigorous German building performance codes (GEG 2024 / DIN standards).
Importing building materials into the Federal Republic of Germany requires strict adherence to EU directives, DIN standards, and the updated Gebäudeenergiegesetz (GEG 2024). Here is how DERCHI delivers certified engineering certainty.
Under GEG criteria, German window installations typically mandate overall thermal transmittance values of Uw ≤ 1.30 W/(m²·K) for standard renovations and Uw ≤ 0.80 W/(m²·K) for Passivhaus standards. Our swing and casement units integrate 34mm–54mm fiberglass-reinforced polyamide thermal breaks (PA66 GF25), warm-edge Swissspacer Ultimate spacers, and argon/krypton filled low-E triple glazing to achieve audited laboratory compliance under DIN EN ISO 10077-1 and 10077-2.
Security against forced entry is a critical specification for German architects and insurance underwriters (VdS). We engineer swing window profiles with reinforced wall thicknesses (≥ 2.0 mm), multi-point circumferential mushroom-head cam hardware (Pilzkopfzapfen), concealed heavy-duty perimeter gear sets, lockable safety handles (100 Nm resistance), and laminated safety glass (VSG under EN 356 P4A/P5A) achieving verified Resistance Class 2 (RC2) and RC3 certification.
German building envelopes demand impenetrable weathersealing. Our systems achieve Class 4 air permeability (DIN EN 12207), Class 9A / E750 driving rain impermeability (DIN EN 12208 at ≥ 600–750 Pa), and structural wind resistance up to Class C5 (DIN EN 12210). Acoustic insulation packages satisfy Schallschutzklassen SSK 3 through SSK 5 (DIN 4109) with sound reduction index values up to Rw = 46 dB, shielding occupants against urban rail and street acoustics.
| Performance Characteristic | German / European Standard | DERCHI System Specification | German Project Applicability |
|---|---|---|---|
| Overall Window U-Value (Uw) | DIN EN ISO 10077-1 / GEG 2024 | Uw 0.78 – 1.15 W/(m²·K) | KfW-Effizienzhaus 40/55 & Passive House Projects |
| Glazing Thermal Value (Ug) | DIN EN 673 | Ug = 0.50 W/(m²·K) (Argon 90%, Triple Low-E) | Multi-Family Residential & Premium Commercial |
| Air Permeability (Luftdichtheit) | DIN EN 12207 | Class 4 (≤ 3 m³/[h·m²] at 100 Pa) | Blower-Door Test (n50 ≤ 0.6 h⁻¹) Mandatory Sites |
| Watertightness (Schlagregendichtheit) | DIN EN 12208 | Class 9A / E900 (Up to 900 Pa without leakage) | Coastal Zones (Nordsee/Ostsee) & High-Rise Facades |
| Wind Load Resistance | DIN EN 12210 | Class C5 / B5 (Deflection < 1/300) | High Exposure Areas & Structural Facades |
| Acoustic Insulation (Schallschutz) | DIN 4109 / EN ISO 717-1 | Rw,P = 38 dB – 47 dB (SSK Class 3 to 5) | Urban Central Stations (Berlin, Frankfurt, Munich) |
| Anti-Intrusion (Einbruchhemmung) | DIN EN 1627 – 1630 | RC2 / RC2N / RC3 with VdS Certification Readiness | Ground Floor Apartments & Luxury Residences |
From the heavy snow loads of the Bavarian Alps to torrential coastal squalls off the North Sea, window systems must be custom engineered for regional micro-climates and architectural typologies.
Coastal saline atmospheres and persistent driving rains require marine-grade anodization (Qualanod ≥ 25 μm) or C4/C5 high-durability powder coating. Triple continuous EPDM vulcanized sealing gaskets stop wind-driven rain penetration under sustained gale-force squalls off the North Sea and Baltic coastlines.
Demanding urban renewal schemes and commercial conversions call for ultra-slim sightlines (Alu-Minimalismus), high light transmittance (g-value optimization), and exceptional soundproofing (DIN 4109 SSK 4/5) using asymmetric acoustic laminated glazing packages to isolate high-frequency street noise.
Extreme winter lows, freeze-thaw cycles, and heavy structural snow loads demand maximum frame stability and deep thermal insulation (multi-chamber polyamides). Our composite aluminum-clad timber swing systems harmonize modern thermal efficiency with traditional Bavarian chalet aesthetic codes.
Industrial loft renovations and modern office headquarters in Düsseldorf and Essen require steel-look aluminum profiles with authentic external Georgian bar grids (Sprossenfenster), custom RAL 7016 / 7021 anthracite fine-textured finishes, and integration with intelligent building management systems (KNX/BACnet).
Understanding downstream architectural shifts allows developers and distributors to specify future-proof joinery systems.
German procurement tenders increasingly require Environmental Product Declarations (EPD according to ISO 14025 and EN 15804). DERCHI utilizes low-carbon billet extrusion aluminum manufactured with hydroelectric energy and recycled scrap fractions, dramatically lowering embodied carbon (CO²e) per square meter to support DGNB and LEED Gold certifications.
Modern German architecture favors total minimalism. We provide concealed swing hinges (verdeckt liegende Bänder), frameless sash profiles, integrated magnetic reed contacts for alarm monitoring (VdS Class C), and mechatronic tilt-and-turn drive units capable of silent motorized night purge ventilation connected to central HVAC systems.
Federal subsidies through BAFA and KfW programs for building envelope retrofits necessitate certified window replacement packages that hit strict U-value thresholds without triggering condensation on cold wall margins (Isotherm calculation compliance according to DIN 4108-2). Our replacement series feature sub-frame adapters that expedite installation without damaging historic masonry.
Clear, audited answers regarding CE marking, DIN standards, customs tariffs, logistics, and quality assurance for Generalunternehmer and wholesale buyers.
Yes. Every batch of DERCHI aluminum swing windows and doors exported to Germany is fully certified under the European Harmonized Standard DIN EN 14351-1. We issue complete Declarations of Performance (DoP / Leistungserklärung) detailing tested U-values, wind load resistance, air permeability, and watertightness, enabling seamless municipal building approval and insurance certification.
Absolutely. We operate dual hardware engineering lines. Clients can select our standard certified heavy-duty perimeter locking systems or specify premium German-made hardware components (such as Siegenia Titan AF, Roto NT/NX, or Gretsch-Unitas). Our extrusion profiles feature standard Euro-groove dimensions (Euro-Nut 15/20 mm), ensuring 100% mechanical interchangeability.
Standard fabrication lead time is 25 to 35 days following CAD shop drawing confirmation and technical sign-off. Direct container shipments depart from Shenzhen/Guangzhou ports to Hamburg or Bremerhaven with an average transit time of 28 to 35 days. We provide comprehensive DDP (Delivered Duty Paid) door-to-jobsite delivery services across Germany, handling all customs clearance and import documentation.
Aluminum windows and doors imported into the European Union from China are classified under TARIC / HS Code 7610 10 00 00 (Doors, windows and their frames and thresholds for doors, of aluminum). We provide complete commercial invoices, packing lists, CE declarations, and Certificates of Origin to ensure swift customs clearance with your freight forwarder or our direct logistics team.
Export packaging complies with strict overseas sea-freight protocols: all profile surfaces are masked with UV-resistant PE protective film, wrapped in shock-absorbing EPE pearl foam, cushioned with custom corner guards, and palletized inside fully enclosed, fumigated solid plywood crates with integrated desiccant packs to prevent moisture condensation during oceanic transit.
Our baseline MOQ for custom-engineered architectural window schedules is 50 square meters or one bundled residential project lot. For large-scale multi-family developments or commercial tenders, we can produce full 20GP or 40HQ container shipments with sequenced floor-by-floor labeling for direct job-site installation efficiency.
Operating from our massive Foshan production base, we combine German precision engineering standards with China's industrial manufacturing power.
Located in Nanhai District, Foshan—the global epicenter of high-end aluminum extrusion—our automated facility houses CNC double-mitre saws, automated thermal break crimping lines, four-corner glass bonding machinery, and precision automated powder-coating lines operating under ISO 9001 and ISO 14001 certifications.
Our in-house design office of 60+ engineers produces detailed shop drawings, BIM Revit families, static wind-load calculations, and isothermal thermal gradient analyses free of charge for approved project schedules, guaranteeing zero tolerance mismatch on site.
Beyond European CE testing, our fenestration profiles have passed the world’s most stringent testing protocols, including Australian AS 2047 N6 cyclonic testing, UL fire-rated certifications, and continuous quality audits, giving German general contractors complete peace of mind.