Engineered Portfolio
Featured Glazed Systems Engineered for South Asian Developments
High-performance architectural door and window assemblies calibrated for superior thermal, acoustic, and cyclonic resistance.
Huasin US Slide Door Custom Energy Efficient Interior Balcony Aluminium Glass Sliding Doors
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New Product 10 Years Warranty Noiseless Double Glass Pressure window Exterior Aluminum Sliding Window
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Modern Design Villas Black Profile Aluminum Frame Front Entry Pivoting Doors for Houses
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Heat Insulation and Windproof Modern Design Aluminum Sliding Glass Window and Stacker Doors Double Glazed
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Aluminium Bifold Folding Patio Door Thermal Break Double Tempered Glass Exterior Sliding Entry Doors Bifold Fold Door
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Modern Indoor Aluminium French Casement Swing Glass Door Internal Glass Walls Divider Interior Metal Framed French Doors
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2025 Customized Hurricane Windows and Doors Impact-Resistant Aluminum Sliding Glass for Home Louver Type
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Local Infrastructure Realities
Architectural Glazing Dynamics Across Bangladesh’s Urban Geographies
Managing high-density acoustic barriers, seasonal monsoon cloudbursts, and marine-induced galvanic corrosion.
In modern commercial hubs like Gulshan, Banani, and Motijheel in Dhaka, urban acoustics present severe structural challenges. The ambient street-level decibel counts routinely exceed 75 to 85 dBA due to concentrated vehicular traffic and commercial density. Standard single-glazed or legacy 5mm float glass sliding units fail to deliver sufficient Sound Transmission Class (STC) attenuation. Commercial real estate ventures, luxury penthouses, and multinational corporate headquarters throughout the capital require precision-engineered double-glazed aluminum systems featuring asymmetrical acoustic laminates (e.g., 6mm Low-E + 12A + 8mm clear toughened with acoustic PVB interlayers). Such assemblies achieve an STC rating above 38 dB, drastically diminishing persistent low-frequency environmental noise and delivering world-class internal acoustic privacy.
Monsoon Water-Tightness (Dhaka & Sylhet)
The sub-tropical monsoon brings sudden, high-velocity torrential downpours with rainfall volumes often exceeding 2,500mm annually. Our engineered high-sill sliding and casement assemblies integrate stepped pressure-equalized weep holes and multi-chamber EPDM dual-durometer rubber gaskets. These prevent internal water leakage, sill overflow, and capillary wall damage under 450+ Pa dynamic water-tightness pressures.
Coastal Marine Corrosion (Chittagong & Cox's Bazar)
Coastal developments, maritime export processing zones (EPZs), and port terminal headquarters in Chittagong encounter extreme salinity and atmospheric chlorides. We deploy high-grade 6063-T5/T6 structural extrusions treated with Qualicoat Class 2 fluorocarbon (PVDF) or architectural powder coatings exceeding 80 microns, completely eliminating oxidation, blistering, and pitting from salt spray.
Severe Wind Load Deflection (Bay of Bengal)
Tropical depressions originating in the Bay of Bengal generate cyclical wind gusts exerting loads up to 2.5 kPa to 3.5 kPa on high-rise façades. Utilizing specialized structural mullion profiles reinforced with internal steel liners and our proprietary Multi-Point Locking hardware, our systems withstand extreme gusting without permanent sash deflection or structural frame displacement.
Market Transformation
Emerging Fenestration Trends in the Bangladesh Building Sector
How green certifications, updated structural codes, and urban industrial expansions are reshaping fenestration specifications.
The construction sector across Bangladesh is navigating a transformative shift propelled by the enforcement of the Bangladesh National Building Code (BNBC) and an aggressive national push toward LEED-certified green industrial architecture. With Bangladesh hosting the highest concentration of LEED Platinum-certified readymade garments (RMG) factories worldwide, corporate industrial developments are abandoning uninsulated single-glazed windows. Developers are mandating fenestration systems with proven Solar Heat Gain Coefficients (SHGC < 0.30) and overall thermal transmittance (U-values < 1.8 W/m²K). These parameters reduce Heating, Ventilation, and Air Conditioning (HVAC) operating loads by up to 32%, directly lowering project operational expenditures.
Simultaneously, the upscale residential sector throughout Bashundhara R/A, Dhanmondi, and Uttara is moving away from basic clear glass panels toward large-span, slim-interlock sliding and lift-slide glazed doors. High-net-worth real estate buyers demand panoramic floor-to-ceiling glass expanses that do not compromise safety. This shift has escalated the adoption of polyamide (PA66) thermal break extrusions, tempered laminated architectural safety glass, and concealed high-security multipoint locks that resist both forced entry and atmospheric pressure drops during major cyclones.
32%
HVAC Energy Reduction
≥ 38 dB
Acoustic STC Damping
3500 Pa
Wind-Load Resistance
100%
BNBC Code Conformity
Enterprise Credentials
Engineering Integrity Backed by Foshan Industrial Scale
Guangdong Dejiyoupin Doors and Windows Co., Ltd. (DERCHI) brings over two decades of export engineering expertise to project stakeholders in Bangladesh.
180,000 m² Production Facility
Situated in the heart of Nanhai, Foshan—China's premier aluminium extrusion hub—our manufacturing facility features automated CNC cutting centres, robotic corner crimping stations, and an integrated assembly infrastructure that outputs over 1,000,000 m² annually.
100+ Patents & Six-Point Locks
We invest continually in structural fenestration R&D with a dedicated team of over 30 engineers. Our patented Four-Side Six-Point perimeter locking systems provide exceptional sash compression, air-tightness, and anti-pry physical security exceeding conventional standards.
Global Quality Certifications
Our engineered systems are certified across rigorous international testing regimes, including CE (Europe), NFRC (USA), AS2047 (Australia), CSA (Canada), ISO 9001, and comprehensive High-Velocity Hurricane Zone (HVHZ) impact testing standards.
Our 8-Step Engineering Execution Protocol
A structured manufacturing and supply chain methodology eliminating on-site installation tolerances for overseas contractors.
01
Drawing Review
Architectural elevations, floor plans, and opening schedules are audited to verify wind-load parameters and sill drainage allowances.
02
R&D Engineering
Thermal breaks, glass make-ups, and structural mullion configurations are tailored to the local regional microclimate.
03
Technical Proposal
Comprehensive CAD shop drawings, acoustic assessments, and structural costing schedules are compiled for structural approval.
04
Details Finalized
Extrusion surface finishes (PVDF/powder coating), glazing interlayers, locking handle styles, and hardware are confirmed.
05
Order Confirmation
Raw material allocation and precision glass tempering lines are queued based on commercial milestones.
06
Tolerance Verification
Openings and shop assembly tolerances are cross-verified with laser alignment benches to avoid frame fitting deviations.
07
360° QC Assembly
Extrusion processing on precision CNC centers followed by full water chamber and air infiltration pressure tests prior to export crating.
08
Installation Guidance
Detailed step-by-step engineering documentation, video guides, and technical coordination ensure smooth on-site handover.
Procurement FAQ
Frequently Asked Questions by Bangladeshi Developers & Contractors
Direct answers concerning Letter of Credit (LC) documentation, Chittagong logistics, and technical specifications.
How does DERCHI handle Letter of Credit (LC) and customs clearing documentation for Chittagong Port?
We routinely handle commercial transactions under irrevocable Letters of Credit (LC at sight) complying fully with Bangladesh Bank guidelines. Our documentation department produces precise Harmonized System (HS) code classifications, commercial invoices, clean Bills of Lading, packed container checklists, and Certificates of Origin (Form E/CO). This allows seamless customs processing through Chittagong Sea Port (CTG) or Dhaka Air Cargo (DAC) without unexpected demurrage charges.
What aluminium alloy grades and profile wall thicknesses are supplied for high-rise projects?
We exclusively utilize virgin primary aluminium billet 6063-T5 and 6063-T6 alloys with structural wall thicknesses ranging from 1.4mm to 2.2mm for residential windows, and up to 3.0mm for high-span sliding patio doors and curtain wall adapters. This guarantees compliance with BNBC wind-load parameters and eliminates the structural warping or sash bowing frequently seen in sub-standard recycled local profiles.
Why is double glazing essential for commercial and high-end residential buildings in Dhaka?
Dhaka’s intense tropical solar radiation combined with severe urban noise pollution makes traditional single-pane glazing inadequate. Our insulated glass units (IGU)—such as 6mm Low-E + 12A (Argon filled) + 6mm Toughened—cut external sound levels by 35 to 40 dB while reflecting up to 70% of infrared solar radiation. This drops indoor cooling expenses noticeably and eliminates moisture condensation inside air-conditioned rooms during humid monsoon months.
How are fragile glass products packaged to avoid breakage across marine transit and road logistics?
All glazed assemblies and profile elements undergo multi-layer export protective packing. Extrusions are wrapped with electrostatic protective film, reinforced with high-density pearl cotton corner pads, and sealed in fumigated, solid ocean-freight plywood crates. Glass panels are separated by cork spacer pads, desiccant bags, and heavy-duty steel bands within the container to safely endure marine transit through the Bay of Bengal and subsequent transit to project sites across Bangladesh.
Can DERCHI customize window configurations directly from local architectural CAD drawings?
Yes. Our structural design team converts your architectural floor plans, CAD elevations, and structural schematics into production-ready shop drawings. We recommend profile depths, glass specifications, and hardware placements to fit your exact structural openings, wind-load calculations, and architectural aesthetics prior to factory fabrication.
Equip Your Next Bangladesh Project With Engineered Fenestration
Send your bill of quantities (BOQ), architectural drawings, or technical specifications to our Foshan engineering team. We deliver custom estimates, structural evaluations, and factory-direct project support tailored for the South Asian market.