Slimline Coplanar
Minimalism Series Ultra Double Glass Slim Profile Flush Casement Window
- 6063-T66 Alloy
- Flush Coplanar Sash
- Double Insulated Glazing
Precision Fenestration Portfolio
Engineered Aluminium Flush Casement & High-Performance Architectural Systems
Direct from our 180,000 ㎡ Guangdong smart manufacturing base. Every system integrates multi-chamber polyamide thermal breaks, multi-point perimeter compression locking, and structural coplanar sightlines built to international code compliance (AS2047, CE, AAMA, ISO9001).
Smart Automation
Level 8 Thermal Insulation Casement Windows with Integrated Smart Louver
- App / Motorized Blind
- PA66 GF25 Thermal Break
- Acoustic Class 4
Hybrid Luxury
High Performance Architectural Aluminum Clad Wood Casement Windows
- Solid Oak/Larch Core
- Exterior Weather Shield
- Uw ≤ 0.95 W/m²K
Severe Weather
AAMA Standard Hurricane-Proof Laminated Glass Heavy-Duty Casement
- Impact SGP Interlayer
- Multi-Point Hardware
- Wind Rating > 4500Pa
Security Entry
Heavy Duty Silvery Aluminum Stainless Steel Mesh Security Hinged Door
- 304/316 Steel Mesh
- Anti-Pry Frame Profile
- High-Flow Air & View
Balcony Panorama
Customized Energy Efficient Double Glass Bi-Fold Doors with Internal Blinds
- Concealed Top Bogie
- Magnetic Blind Slats
- Thermal Break Barrier
Extra Wide Vista
Extra-Wide Aluminum Tempered Glass Foldable Partition System
- Low Threshold Track
- Tempered Safety Glass
- Heavy Commercial Load
Storefront Ingress
Waterproof Commercial Storefront Thermal Break Accordion Bifold System
- Double EPDM Weathering
- Acoustic Buffer Track
- Heavy-Cycle Tested
Engineering White Paper
The Technical Anatomy of Flush Casement Fenestration: Mechanics, Physics, & Geometry
Why modern global architectural specifications are migrating from traditional lipped or stepped casements to coplanar flush aluminium envelope systems.
Coplanar Exterior Plane & Aerodynamic Drag
Traditional casement windows feature an overlapping lip ("stormproof sash") that stands proud of the outer frame by 8 mm to 14 mm. In high-wind, high-precipitation environments, this proud ridge induces localized vortex shedding and pressure differentials, driving driven rainwater toward secondary seals.
Our flush aluminium casement profiles align sash and outer frame into a mathematically planar surface (±0.5 mm tolerance). This laminar boundary reduces wind noise turbulence by up to 5.2 dB(A) and eliminates pressure concentration points.
Thermal Bridging & Isothermal Flow
Aluminum exhibits a high thermal conductivity ($\lambda \approx 160\text{–}200\text{ W/m}\cdot\text{K}$). Without advanced isolation, heat transfers rapidly, resulting in condensation and HVAC inefficiency. We integrate continuous 24 mm to 34 mm PA66-GF25 (polyamide reinforced with 25% glass fiber) thermal breaks.
By filling hollow internal chambers with low-density expanded polyolefin foams, heat convection across cavities is suppressed, delivering system thermal transmittances down to Uw ≤ 1.1 W/(m²·K) for triple-glazed units.
Tri-Barrier Gasket Compression
A window's long-term resistance to air infiltration and water intrusion depends strictly on gasket material science and closure compression kinematics. We deploy vulcanized continuous cellular EPDM gaskets arranged in a three-tier defense hierarchy.
Our center fin gasket creates a dedicated de-pressurized drainage isobar chamber. Any water driven through the outer deflection lip is relieved of hydrostatic pressure and drained gravitationally via concealed weep slots before touching internal acoustic air-seals.
Key Engineering Insight: The Pressure Equalization Principle in Coplanar Fenestration
When wind hits an architectural facade, an intense exterior high-pressure zone ($P_1$) develops. If the internal chamber between frame and sash is closed without equalization, a pressure gradient ($\Delta P = P_1 - P_2$) forces water across every micro-capillary crack. DERCHI flush casement systems utilize engineered exterior equalization vents that equalize internal chamber pressure to atmospheric conditions ($\Delta P \to 0$). Water has no kinetic pressure gradient driving it inward, preventing penetration even under 700 Pa dynamic hurricane testing.
Strategic Sourcing Analysis
Future Procurement Trends: Where Architectural Fenestration Is Headed (2025–2030)
Global developers, commercial general contractors, and structural engineers are recalibrating their window procurement matrices around four macro-shifts.
1. Embedded Low-Carbon Primary Ingot Sourcing
Governments across Europe, North America, and Australia are instituting Carbon Border Adjustment Mechanisms (CBAM) and strict Whole-Life Carbon assessments. Standard primary aluminium production generates up to 16 kg of CO₂ per 1 kg of metal when powered by coal electricity.
Future tenders mandate certified hydro-powered or secondary recycled billet with an embodied carbon footprint ≤ 4.0 kg CO₂e/kg Al. Factories lacking supply chain transparency will be disqualified from international LEED Platinum and BREEAM Outstanding projects.
2. BIM Level 2 & Parametric Digital Twins
Procurement teams are shifting away from fragmented static 2D DWG submittals. Modern contracts demand parametric Autodesk Revit / IFC families embedded with validated acoustic transmission loss curves, thermal U-values, center-of-glass solar heat gain coefficients (SHGC), and glass deflection models.
Our engineering bureau develops fully clash-detected digital shop drawings directly within your project's coordinate matrix, reducing field modification work orders by over 92% during construction.
3. Pre-Assembled Unitized Infill Glazing
Jobsite labor costs in North America, Western Europe, and Australasia now account for 45% to 60% of total installed fenestration expenditure. Sourcing knocked-down (KD) windows for site assembly is becoming unviable due to high regional labor rates and inconsistent installation sealing.
The clear sourcing trend is toward pre-glazed, factory-torqued, pressurized-chamber casement units delivered in custom steel-palletized sea containers ready for direct crane hoisting into structural rough openings.
4. Extreme Durability & Coastal Resiliency
Climate disruption has elevated coastal wind velocity profiles, storm surge frequencies, and UV radiation degradation rates. Traditional architectural powder coatings degrade within 5 to 7 years in C4 and C5 coastal marine belts (e.g., Lagos, Durban, Miami, Caribbean coastal corridors).
Procurement specifications now explicitly demand AAMA 2605 / Qualicoat Class 3 fluorocarbon (PVDF) 70% Kynar resin systems or Class 1 (25 μm) architectural anodization offering 30-year resistance to salt-fog pitting.
Engineering Specifications
Comparative Performance Matrix: Flush Casement vs. Traditional Fenestration
Data-driven technical analysis for façade consultants, structural engineers, and estimating directors.
| Performance Parameter | Aluminium Flush Casement | Traditional Stepped Casement | Tilt-and-Turn Systems | Sliding Window Systems |
|---|---|---|---|---|
| Aesthetic Alignment | 100% Seamless Coplanar (Zero reveal) | Stepped lip (8–14mm overhang) | Flush internal, stepped external | Overlapping staggered profiles |
| Thermal Transmittance ($U_w$) | 0.95 – 1.4 W/(m²·K) (PA66 Breaks) | 1.4 – 2.2 W/(m²·K) | 1.1 – 1.6 W/(m²·K) | 2.0 – 3.2 W/(m²·K) |
| Airtightness (EN 12207 / AS2047) | Class 4 (Highest rating, ≤0.5 m³/h·m) | Class 3 | Class 4 | Class 2 – 3 (Brush seal leakage) |
| Water Tightness (EN 12208) | Class E1050 (1050 Pa static pressure) | Class 7A – 9A (300–600 Pa) | Class 9A – E750 | Class 4A – 6A (Track water overflow) |
| Acoustic Attenuation ($R_w + C_{tr}$) | Up to 44 dB (With acoustic laminate) | 35 – 38 dB | 38 – 42 dB | 28 – 32 dB |
| Structural Wind Load (EN 12210) | Class C5 (±3000 Pa deflection L/300) | Class C3 – C4 | Class C4 | Class B3 – C3 |
| Hardware Concealment | 100% Concealed hinges & shootbolts | Exposed butt or surface hinges | Semi-concealed or visible gearing | Visible roller track and latch |
Tier-1 Manufacturing Infrastructure
Guangdong Dejiyoupin Doors and Windows Co., Ltd. (DERCHI)
Recognized among the Top 10 fenestration and door brands in China. Spanning over 25 years of engineering mastery, DERCHI operates an integrated 180,000 ㎡ high-precision intelligent production hub in Foshan, Guangdong. Equipped with German 5-axis Elumatec profile machining centers, automated corner-crimping robots, and in-house laboratory facilities certified for CE, ISO9001, Australian AS2047 N6 cyclonic testing, and UL fire standards.
180,000
Square Meter Smart Factory
600+
Skilled Craftsmen & Engineers
100+
Global Patents & Certifications
AS2047 N6
Highest Wind & Water Rating
Zero-Defect Quality Engineering
End-to-End Quality Control Protocol: From Ingot Homogenization to Sea-Freight Crate
International exports fail most commonly at the intersections of profile coating thickness, glass desiccant saturation, hardware calibration, and container ocean moisture control. Here is how DERCHI eliminates export risk.
CNC Precision Mitering & Corner Injected Crimping
Every flush frame and sash joint is cut on dual-head high-speed CNC saws with ±0.1 mm dimensional and ±0.1° angular tolerance. Corners receive heavy-duty extruded aluminum corner cleats, stainless alignment chevrons, and automated two-part polyurethane structural joint adhesive injection.
This creates a monolithically fused frame that will not rack, sag, or compromise coplanar alignment over decades of heavy cycling.
Dual-Sealed Insulated Glass Unit (IGU) Assembly
Glass failure manifests as milky fogging inside the airspace. We construct all double- and triple-glazed units using warm-edge composite spacers (lowering edge-seal linear thermal bridge $\psi$ by 0.04 W/mK) filled with 95%+ pure Argon gas.
The primary seal utilizes continuous polyisobutylene (PIB), while the secondary structural seal employs two-component neutral structural silicone, ensuring helium-tested hermetic isolation against moisture vapor ingress.
Ocean-Freight Reinforced Steel & Plywood Crating
Standard wooden pallets buckle under 30-day ocean transit vibration and rough port handling in Lagos, Tema, Durban, or Long Beach. DERCHI packs windows in custom heavy-duty, fumigated IPPC-stamped marine plywood crates backed with internal galvanized steel framing.
Each unit is individually protected with PE surface peel-film, corner buffers, vacuum-desiccant packs, and foam interlayers to ensure flawless delivery ready for direct crane hoisting.
Procurement Clarity
Frequently Asked Questions for International Fenestration Procurement
Authoritative technical responses covering engineering, compliance documents, custom finishes, and delivery logistics.
What specific structural parameters define a true "flush" casement window versus standard systems?
A genuine flush casement window requires that the exterior face of the operable sash sits completely coplanar with the exterior face of the fixed outer frame when in the latched position. This creates a flat, seamless 180° plane without any stepped overlap or stormproof lip. Structurally, this requires specialized 4-bar friction stays or concealed 3D-adjustable European hinges that swing outward before clearing the frame jamb. Furthermore, the sealing system must rely on active compression perimeter gaskets rather than overlapping face gaskets, demanding manufacturing tolerances within ±0.5 mm across diagonal dimensions to guarantee airtightness.
How do DERCHI flush casement windows achieve compliance with Australian AS2047 N6 and American AAMA standards?
Australian AS2047 N6 is one of the most rigorous standard ratings globally, covering cyclonic wind resistance, water penetration, and air infiltration. DERCHI systems achieve N6 certification by incorporating high-tensile 6063-T66 aluminum profiles with structural wall thicknesses exceeding 2.0 mm at critical structural load flanges. Our corner joints utilize injected polyurethane structural adhesive alongside cold-formed die-cast aluminum corner keys to resist deflection under extreme dynamic cycling (>4500 Pa design wind pressure). For North American AAMA compliance, our systems undergo ASTM E283 air infiltration, ASTM E331 water penetration (at 15 psf/720 Pa minimum), and ASTM E330 structural deflection tests witnessed by third-party testing bodies.
Can DERCHI engineer custom RAL finishes and anodized coatings for severe coastal saline environments?
Yes. For coastal installations within 500 meters of open marine shorelines (such as Lagos, Tema, Durban, Miami, or Sydney), standard polyester powder coatings can degrade due to galvanic and filiform corrosion. DERCHI utilizes certified architectural PVDF (polyvinylidene fluoride) fluoropolymer coatings containing 70% Kynar 500 / Hylar 5000 resin, meeting AAMA 2605 specifications. This process includes multi-stage chromate or non-chrome pre-treatment and delivers over 4,000 hours of continuous neutral salt-spray resistance (ASTM B117). Alternatively, we provide Class 1 (25 μm) architectural anodizing in clear, champagne, bronze, and deep black.
What is the complete technical process for shop drawings, sample approvals, and container consolidation?
Our engineering bureau operates on a standardized 5-step milestone framework:
Step 1: Rough Opening & Structural Schedule Review: You provide CAD elevations, window schedules, and site wind load requirements. Our structural engineers review thermal, water, and structural criteria.
Step 2: Parametric Shop Drawing Generation: We produce detailed 1:1 scale CAD/BIM shop drawings detailing frame junctions, flashing reglets, anchoring lugs, glazing build-ups, and drainage weep geometries. Production begins only upon your signed approval.
Step 3: Sample & Mockup Signoff: For large commercial developments, we fabricate full-scale corner or whole-window prototypes for physical testing and aesthetic client signoff.
Step 4: Lean Controlled Manufacturing: CNC cutting, profile machining, corner crimping, gasket insertion, automated glazing, and 100% pre-assembly inspection in our 180,000 ㎡ base.
Step 5: Consolidative Export Packing: Custom steel-braced plywood crating, numbered container loading plans, and export clearing document issuance (Form M, SONCAP, KEBS, CE Declaration of Performance, Bill of Lading).
Step 1: Rough Opening & Structural Schedule Review: You provide CAD elevations, window schedules, and site wind load requirements. Our structural engineers review thermal, water, and structural criteria.
Step 2: Parametric Shop Drawing Generation: We produce detailed 1:1 scale CAD/BIM shop drawings detailing frame junctions, flashing reglets, anchoring lugs, glazing build-ups, and drainage weep geometries. Production begins only upon your signed approval.
Step 3: Sample & Mockup Signoff: For large commercial developments, we fabricate full-scale corner or whole-window prototypes for physical testing and aesthetic client signoff.
Step 4: Lean Controlled Manufacturing: CNC cutting, profile machining, corner crimping, gasket insertion, automated glazing, and 100% pre-assembly inspection in our 180,000 ㎡ base.
Step 5: Consolidative Export Packing: Custom steel-braced plywood crating, numbered container loading plans, and export clearing document issuance (Form M, SONCAP, KEBS, CE Declaration of Performance, Bill of Lading).
How does DERCHI resolve container ocean transit moisture and glass thermal breakage risks?
During 30-to-45 day sea shipping across varying climatic zones, containers experience severe temperature fluctuations leading to "container rain" (condensation). We seal each window crate with water-impermeable shrink wrap containing high-capacity calcium chloride desiccant bags. Furthermore, all glass panels utilize fully tempered safety glass (meeting ANSI Z97.1 and EN 12150) with polished edgework to eliminate edge micro-fractures. For projects located at high altitudes or crossing mountain passes, we integrate capillary breathing tubes or balance valves into the insulated glass spacer to equalize air pressure differentials and prevent spontaneous implosion or convex bowing.
What hardware brands and multi-point locking mechanisms are integrated into DERCHI casements?
A high-performance casement window depends fundamentally on its hardware gear train. We partner directly with world-class hardware leaders including Sobinco (Belgium), Siegenia (Germany), Hoppe (Germany), and CMECH (USA), alongside proprietary DERCHI heavy-duty stainless steel mechanisms. Each flush sash features concealed heavy-duty 4-bar friction hinges manufactured from SUS304/SUS316 austenitic stainless steel, paired with perimeter mushroom-cam drive gears and anti-lift keeps. This multi-point perimeter locking configuration distributes uniform compression across all four sides of the frame, delivering RC2 / PAS24 forced-entry burglar resistance.
Initiate Your Architectural Project with DERCHI Engineers
Submit your rough openings, architectural door and window schedules, or tender drawings. Our fluent English-speaking engineering team will furnish complimentary CAD shop drawings, wind-load calculation summaries, and direct factory-gate quotations within 24 hours.
