EcoCocon: A Wall System Designed by Nature
Building a regenerative future with carbon-storing construction that prioritises health, comfort, and environmental responsibility. HPM company can become your reliable subcontractor in construction technologies based on straw panels and hemp blocks. We possess a high level of expertise in the execution of ecologically responsible projects. Our capabilities ensure the efficient and sustainable implementation of innovative solutions in the construction sector.
Belgium's Built Environment Is Transforming
The Challenge We Face
Belgium is moving decisively toward Nearly Zero-Energy Buildings (NZEB), creating both a mandate and an opportunity for architects and developers. This transition demands more than incremental improvements—it requires a fundamental reimagining of how we build.
Traditional construction materials like concrete and steel emit up to 800 kg CO₂ per cubic metre during production. Conventional insulation relies on petrochemical products that contribute to climate change while offering limited indoor air quality benefits. The building sector accounts for nearly 40% of global carbon emissions, making material choices critical to climate action.
A Nature-Based Solution
EcoCocon offers architects the opportunity to design structures that respect both energy performance standards and environmental stewardship. Our prefabricated straw panels and hempcrete blocks combine exceptional thermal insulation with natural aesthetics and remarkably low embodied carbon.
This isn't about compromising design vision for sustainability—it's about expanding what's possible. EcoCocon components are compatible with both contemporary and traditional facade treatments, offering complete creative freedom while delivering Passivhaus-certified performance. You can achieve fire resistance ratings of EI 60–90, acoustic isolation of 40–55 dB, and zero VOC emissions, all while dramatically reducing your project's carbon footprint.
HPM Company: Your Partner in Sustainable Construction
Nature-Inspired Engineering
Our wall systems combine the structural intelligence of timber framing with the thermal excellence of agricultural byproducts, creating components that store carbon rather than emit it.
Passivhaus Certified
Every EcoCocon component meets rigorous Passivhaus standards with no thermal bridges and easy-to-achieve airtightness, eliminating the performance gaps common in conventional construction.
Global Experience
With projects across 20 countries and 3 continents since 2008, we bring deep expertise in climate-neutral, healthy, nature-returnable construction to every collaboration.
HPM Company serves as a building contractor specialising in the delivery of EcoCocon wall systems throughout Belgium and beyond. We work closely with architects, developers, and builders to integrate regenerative design principles into real-world projects. Our approach transforms construction from an extractive process into one that actively contributes to climate solutions—storing over 12 tons of CO₂ in a typical residential project with 130 m² of external wall area.
Climate Impact: Regenerative Design That Stores Carbon
Material Composition
  • 10% timber from certified sustainable forestry
  • 89% straw sourced from local farms
  • 1% other natural materials
  • No glues, no chemicals, no synthetics
A Positive Climate Contribution
EcoCocon is the only building component with both Passivhaus and Cradle to Cradle certifications, designed for minimal ecological footprint and safe return to nature after its service life ends.
During their growth, timber and straw sequester atmospheric CO₂ through photosynthesis. When used in their raw states with minimal processing, this carbon remains safely stored in the construction. The panels in a typical house with 130 m² of external wall area sequester more than 12 tons of CO₂—equivalent to the annual emissions of approximately 2.5 passenger vehicles.
By replacing carbon-intensive materials such as concrete, bricks, and polystyrene insulation, EcoCocon's real contribution becomes even more significant. Our solution can cut a project's carbon footprint in half while maintaining or exceeding conventional performance standards.
97.6
kg CO₂ Sequestered
Per square metre of wall assembly
2.8
kg CO₂ Emitted
During production per m²
12+
Tons Stored
In a typical 130 m² house
Comfort at the Core: Healthy Indoor Climate Without Complex Technology
The EcoCocon wall system provides superior indoor air quality alongside exceptional thermal and acoustic comfort. It creates a naturally healthy microclimate with even temperatures throughout the year—warm in winter, cool in summer—without relying on energy-intensive mechanical systems.
Natural Humidity Regulation
Interior clay plaster acts as an effective passive humidity regulator, absorbing excess moisture and releasing it when levels drop. This maintains optimal humidity levels between 40–60% without mechanical intervention—creating healthier indoor conditions and protecting against mould growth.
Zero VOC Emissions
The wood and straw in our panels contain no glues and undergo no chemical treatment during production. Clay plaster finishes are completely natural, emitting no volatile organic compounds. This means genuinely clean indoor air, particularly important for schools, homes, and healthcare facilities.
Exceptional Acoustic Performance
With 54 dB sound insulation, EcoCocon panels greatly exceed minimum standard requirements. This level of acoustic isolation creates peaceful, quiet interiors—ideal for residential buildings, educational institutions, and office environments where concentration matters.
"Natural ventilation plus thermal mass equals year-round comfort without air conditioning. The system is airtight yet vapour permeable—allowing excess humidity to escape while eliminating the thermal bridges that create draughts, mould, and condensation problems in modern sealed buildings."
The EcoCocon Wall System: Technical Excellence
The EcoCocon wall system is a certified Passivhaus component combining structural timber framing with straw infill. Each panel is custom-made to precise specifications for every project, ensuring perfect integration with your architectural vision.
01
Ventilated Facade or Render
Complete design freedom for exterior expression—compatible with any facade system from traditional render to contemporary rainscreen cladding.
02
Insulating Fibre Board (60–100 mm)
Additional thermal buffer layer with thickness varying by climate zone, contributing to exceptional overall U-values.
03
Airtight Diffusion-Open Membrane
Critical weather protection layer that maintains airtightness while allowing vapour to escape—preventing moisture accumulation.
04
Timber-Straw Panel (400 or 300 mm)
The structural and thermal heart of the system—load-bearing capacity up to 110 kN/m with thermal conductivity of just 0.0645 W/mK.
05
Base Clay Coat (25 mm)
Foundation layer for interior finish, contributing thermal mass and initial moisture regulation capacity.
06
Reinforcing Mesh
Structural support ensuring long-term durability of clay plaster system across the building's service life.
07
Fine Clay Plaster (3 mm)
Beautiful natural finish surface providing humidity regulation, thermal mass, and exceptional indoor air quality without VOC emissions.
This construction has been verified through WUFI hygrothermal calculations and validated by on-site measurements across hundreds of projects. More than 30 predefined wall build-up variants are available as 3D BIM models for Revit, complete with technical parameters that facilitate and accelerate the design process.
Technical Characteristics: Performance That Exceeds Standards
These specifications represent an average EcoCocon wall assembly with 30 mm clay plaster, 400 mm timber-straw panel, and 60 mm wood fibre board. Performance can be adjusted to meet specific project requirements.
Thermal & Energy Performance
  • U-value: 0.123 W/m²K—far exceeding Passivhaus requirements
  • Thermal conductivity: 0.0645 W/mK
  • No thermal bridges in standard construction details
  • Easy airtightness: Consistently achieves <0.6 air changes per hour at 50 Pa
Fire & Safety
  • Fire resistance: Up to 120 minutes (EI 60–90 typical)
  • Flammability classification: B-s1, d0 (limited combustibility, minimal smoke, no flaming droplets)
  • Natural fire resistance: Compressed straw naturally resists combustion
Acoustic & Indoor Environment
  • Airborne sound insulation: 54 dB—exceptional acoustic isolation
  • No VOC emissions: Zero volatile organic compounds
  • Humidity regulation: Clay plaster maintains 40–60% relative humidity
Structural & Installation
  • Vertical load-bearing capacity: Up to 110 kN/m—suitable for 6-storey construction
  • Manufacturing precision: ±2 mm over 3 m length
  • Average straw density: 115 kg/m³
  • Assembly time: 20–40 minutes per m²
97.6
kg CO₂ Sequestered
Per square metre of wall
2.8
kg CO₂ Emitted
In production per m²
Panel Types & Customisation: Made to Measure for Any Design
Complete Design Freedom
EcoCocon panels are manufactured in 1 mm increments to fit any building design, from contemporary residential projects to large-scale commercial and educational facilities. This precision manufacturing ensures seamless integration with your architectural vision without forcing design compromises.
Available panel types include standard braced panels, lintels for openings, window and door sills, and inclined gable wall elements for complex roof geometries. Different structural demands can be accommodated by adjusting panel spacing or incorporating plywood-reinforced column elements where additional load-bearing capacity is required.
The double wooden frame system ensures structural capacity for buildings up to 6 storeys while maintaining the system's thermal bridge-free design. Standard panel thickness is 400 mm, with 300 mm options available for projects with specific space constraints.
1
Standard Braced Panels
Load-bearing wall sections manufactured to exact dimensions, with integrated timber framing providing structural capacity and straw infill delivering thermal performance.
2
Lintel Elements
Specially engineered panels for spanning openings, maintaining structural continuity and thermal performance above windows and doors.
3
Sill Components
Purpose-designed elements for window and door sills, ensuring proper water management and thermal bridge-free detailing at these critical junctions.
4
Gable Wall Elements
Inclined panels precisely cut to match roof geometries, accommodating any pitch or configuration while maintaining system performance standards.
Seamless Planning Process with Expert Technical Support
With more than 10 years of experience, the EcoCocon natural construction system has been successfully implemented across more than 20 countries on 3 continents. We combine the beauty of natural materials with the precision of Passivhaus standards, providing complete technical support throughout your project journey.
Design Integration
Access predefined EcoCocon wall elements as 3D BIM models for Revit, complete with technical parameters. Our system accommodates any building design, ensuring complete creative freedom.
Technical Panel Project
Our in-house structural engineer prepares detailed specifications for all panel types and sizes required, ensuring perfect coordination with your architectural drawings.
Local Technical Consultant
Each project is overseen by a dedicated consultant ensuring smooth cooperation and providing expert technical support whenever needed.
For Architects
  • Design quality architecture aligned with UN Sustainable Development Goals
  • Create exceptional living quality that surpasses client expectations
  • Easily achieve Passivhaus standard while maximising natural material use
  • Work creatively with modular elements and pre-designed details
  • Access comprehensive building physics knowledge and cost-effective solutions
For Builders & Developers
  • Rapid installation: 20–40 minutes assembly time per m²
  • Precision manufacturing: ±2 mm tolerance over 3 m length
  • Reduced on-site complexity with prefabricated components
  • Predictable performance verified through hundreds of completed projects
  • Future-proof investment meeting evolving building regulations
Connect With Us: Building Belgium's Sustainable Future Together
Van Delmar SRL
Your EcoCocon Partner in Belgium
We are committed to transforming construction practices throughout Belgium, introducing architects, builders, and developers to regenerative design principles that store carbon, enhance occupant health, and create buildings that contribute positively to our climate future.
Volodymyr Hrytsenko, Gérant
TVA: BE 0736 416 179
Av. François Sebrechts 58/11
Belgium
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"Building a future that doesn't harm the planet"
Join our growing network of architects, builders, and developers who are choosing regenerative construction. Together, we're proving that exceptional building performance, occupant health, and environmental responsibility aren't competing priorities—they're natural partners in creating the built environment our future demands.