Wholesale Portfolio
High-Performance Fenestration & Garden Projection Assemblies
Engineered to international structural and thermal standards, our specialized product line provides turn-key fenestration packages for architects, residential builders, and commercial distributors.
Industrial Capability
Engineering Rigor & Global Supply Chain Dominance
Operating from Foshan—the epicenter of China's precision aluminium metallurgy—Guangdong Dejiyoupin Doors and Windows Co., Ltd. (DERCHI) represents top-tier engineering recognized worldwide.
180,000m²
Production Infrastructure
25+
Years Engineering Expertise
600+
Master Technicians & Staff
100+
Patents & CE/ISO Accreditations
Schüco Engineering Standard Alignment
Validated by our strategic project collaborations with multi-villa builders across the UK who historically rely on German Schüco systems, DERCHI delivers matching dimensional stability, acoustic dampening, and multi-point mechanical hardware at wholesale factory efficiency.
Severe Climate Compliance (AS 2047 N6 & CE)
DERCHI fenestrations and garden projection modules are verified through rigorous mechanical cycling, air infiltration, and water pressure chamber stress testing. Our fenestrations have achieved AS 2047 N6 structural cyclone grading and full compliance with European EN 14351-1 standards.
Parametric CAD/BIM Schedule Preparation
Eliminate project delays and on-site fitting anomalies. Our in-house facade engineers generate comprehensive 2D CAD shop drawings, structural wind-load simulations, and BIM object assets matched directly to your fenestration schedules before factory tooling begins.
Industry Intelligence
Engineering Evolutionary Trends in Aluminum Garden Windows
Garden windows have transitioned from simple greenhouse boxes into complex architectural cantilevered envelopes requiring high load capacities and severe climate control.
Polyamide Thermal Barriers
Early iterations of garden windows suffered from cold bridging, internal condensation, and frost build-up along frame corners. Modern wholesale production incorporates PA66 nylon thermal break strips reinforced with 25% fiberglass, mechanically crimped between interior and exterior 6063-T5/T6 aluminum profiles to deliver whole-unit thermal transmittance values as low as Uw ≤ 1.1 W/(m²·K).
Monolithic Overhead Slope Safety Glazing
Building codes globally (including US IRC/IBC and EU Eurocodes) now mandate high-impact performance for projected sloped glazing. Standard double pane float units are replaced with overhead laminated glass sandwiches (5mm Tempered + 1.52mm PVB/SGP + 5mm Tempered) featuring double-sealed polysulfide or structural silicone edge seals, inert Argon gas cavities, and soft-coat Low-E layers that reflect infrared heat while transmitting visible light.
Concealed Weep Systems & Air Sealing
Projected outward from vertical wall planes, garden windows endure amplified hydrostatic pressures during wind-driven rain events. Our manufacturing employs multi-chamber internal drain channels with reverse check-valves and continuous vulcanized EPDM triple-gasket perimeter seals, eliminating internal leakage risks under positive air pressures up to 600 Pa.
Market Strategy
Future Procurement Trends in Architectural Fenestration
A comparative structural and performance baseline for global building developers, procurement officers, and structural engineers sourcing high-volume fenestrations from China.
| Evaluation Parameter | Legacy Sourcing Specifications | Next-Generation Procurement Demands | DERCHI Manufacturing Delivery Baseline |
|---|---|---|---|
| Alloy Metallurgy & Temper | Recycled blend 6063-T5 aluminum, variable wall thickness (1.2mm - 1.4mm) | Virgin ingot 6063-T6 or 6060-T66 aluminum, precision calibrated ≥ 2.0mm structural wall profiles | Certified virgin primary alloy 6063-T5/T6 with tensile yields ≥ 160 MPa, high wall structural rigidity |
| Thermal Transmittance (U-Value) | Non-thermal break or generic PVC clips (Uw 2.8 - 3.5 W/m²K) | Deep PA66 polyamide bar fills with aerogel/insulating foam cores (Uw ≤ 1.2 W/m²K) | Multi-cavity polyamide thermal breaks; Passivhaus-aligned thermal optimization on demand |
| Architectural Finish Durability | Standard domestic electrostatic powder coating (5-year UV degradation limit) | Qualicoat Class 2/3 Superdurable powders, AAMA 2604/2605 fluorocarbon (PVDF) coating | AkzoNobel / PPG Certified AAMA 2605 PVDF & marine-grade anodized profiles (> 25 micron) |
| Structural Load Integrity | External cantilever struts or internal bracket supports visible to room occupants | Internal cantilevered high-load corner brackets with hidden wall structural anchors | Engineered structural load-transfer brackets engineered for seismic and wind gust resilience |
| Building Regulation Proof | Factory self-declaration datasheets lacking third-party accreditation | Mandatory accredited third-party lab testing: CE (EN 14351-1), NFRC, CSA, AS 2047 | Comprehensive batch testing reports, full declaration of performance, and CE/AS documentation |
Technical Clarifications
Frequently Asked Questions for Commercial Buyers
Direct technical guidance covering structural tolerances, international logistics, and building code compliances.
How do DERCHI garden windows maintain structural rigidity without sagging over extended cantilever spans?
Unlike standard residential casements, garden windows operate under continuous downward eccentric moments caused by the cantilevered projection of heavy multi-pane glass. DERCHI solves this through heavy-wall (2.0mm–3.0mm) 6063-T6 aluminum corner mullions, internal stainless-steel corner gussets, and high-tensile internal tie-rod cables mounted to the building's rough opening header. This integrated sub-structure supports structural dead loads and snow accumulations up to 150 kg/m² without visible frame deflection or glass seal rupture.
What measures prevent solar overheating and thermal failure on the sloped upper glass pane?
Sloped top glass modules absorb perpendicular solar radiation throughout high-noon hours. We engineer these surfaces with custom Solarban® or Low-E double/triple-glazed insulated units featuring a low Solar Heat Gain Coefficient (SHGC ≤ 0.28). In addition, our manufacturing incorporates warm-edge stainless steel spacers and automated factory-filled Argon gas, keeping the internal shelf space cool while blocking 99% of UV rays that cause interior fading.
Can custom garden window dimensions and side ventilations be integrated directly into your production lines?
Yes. Every production run is configured to custom project shop drawings. Buyers can designate front fixed picture windows paired with side ventilating casements or awnings equipped with concealed European multi-point operators. We also support internal adjustable glass shelving systems mounted directly into structural profile slots, architectural shading louvers, and integrated motorized insect screens.
How does your export packaging prevent damage during international ocean transport?
Due to the three-dimensional volumetric footprint of garden windows, flat-packing is structurally inadvisable. DERCHI utilizes reinforced steel-strapped, fully enclosed non-coniferous fumigated plywood crates. Each glass surface is masked with anti-scratch protective poly film, corners are shielded with high-density EVA shock absorbing protectors, and internal desiccant bags are added to prevent vapor spotting during equatorial ocean voyages to European, American, and Australian ports.
What formal documentation accompanies commercial shipments for building control handover?
Commercial wholesale packages include complete project documentation: Mill Test Certificates (MTC) for structural aluminum alloys, Qualicoat powder coating adhesion reports, glass safety tempering certifications (SGCC / CE EN 12150), whole-window thermal calculation datasheets (EN ISO 10077), and Declaration of Performance (DoP) documents verified for CE and AS 2047 code inspections.