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Hempcrete Interiors · India

Driving
Sustainable
Solutions

Pioneering bio-based hempcrete interior applications across Eastern India — where ecology meets extraordinary design.

Our Projects Start a Conversation
1st
Hempcrete Project · East India
3
Expert Co-Founders
Net Negative
Carbon Footprint
The Material

What is
Hempcrete?

Hempcrete is a bio-composite of hemp shiv and a lime-based binder. It creates walls that breathe, insulate, and actively sequester carbon — one of the most advanced sustainable building materials available today.

01

Acoustic Insulation

Natural fibre matrix absorbs sound frequencies, dramatically reducing noise transmission between spaces.

02

Thermal Regulation

High thermal mass stabilizes interior temperature, reducing energy consumption and HVAC dependence year-round.

03

Carbon Negative

Hemp absorbs CO₂ as it grows and continues to sequester carbon once set — a wall that heals the planet.

04

Moisture Balancing

Naturally hygroscopic — regulates humidity and prevents mould without chemicals or synthetic barriers.

Bio-Based · Carbon Negative

"A wall that doesn't just divide space — it elevates it."

Thermal Conductivity
0.22 W/mK
Sound Absorption
NRC up to 0.80
Carbon Sequestered
~110 kg CO₂/m³
Lifespan
100+ years
Hempcrete material
The Performance Case

Why Hempcrete
Outperforms

These are not claims — they are measured, published figures. Hempcrete's performance advantage over conventional materials is quantifiable, peer-reviewed, and increasingly recognised by India's own green building standards.

Independently Lab-Tested · November–December 2025

"Performance that is not claimed — it is certified."

Thermal Conductivity
0.22 W/mK
Heat Capacity
0.300 MJ/m³K
TL at 500 Hz (50mm)
15.2 dB
Thermal Diffusivity
0.742 mm²/s
Hempcrete performance
0.22
W/mK — Thermal Conductivity
5–8× better than standard concrete. 3–4× better than clay bricks.
0.300
MJ/m³K — Heat Capacity
Active thermal mass that buffers temperature swings — unlike lightweight synthetics.
0.73
W/m²K — U-Value (300mm wall, est.)
A monolithic wall delivering both structure and insulation in a single layer.
GRIHA
Green Building Compliance
Qualifies for points under alternative materials criteria as an agricultural byproduct.
Insulation
4× More Effective
Than Red Clay Brick

Tested hempcrete achieves a thermal conductivity of 0.22 W/mK — independently verified at the Mahindra TERI Centre of Excellence, Gurugram (Report No. MTCoE-1202025001, ISO 22007-2:2022). This places it 4 times better than traditional red clay brick and 5–8 times better than standard concrete, delivering exceptional thermal insulation in a single bio-based wall layer.

Tested by: Mahindra TERI Centre of Excellence, Gurugram · ISO 22007-2:2022
Climate Resilience
Naturally Cool,
All Summer Long

With a tested thermal diffusivity of 0.7420 mm²/s and specific heat capacity of 0.300 MJ/m³K, hempcrete resists rapid heat transfer and actively stores thermal energy — buffering interior temperatures against peak summer spikes. A passive climate solution engineered into the wall itself, without mechanical cooling.

Tested by: Mahindra TERI Centre of Excellence, Gurugram · ISO 22007-2:2022
Acoustic Performance
Lab-Proven
Sound Attenuation

Transmission loss and sound absorption independently measured at IIT Kharagpur's Acoustics & Condition Monitoring Laboratory using B&K 4206 Impedance Tube (ASTM E2611 & ASTM E1050 standards). A 50mm hempcrete panel achieves up to 15.2 dB transmission loss at 500 Hz — with performance increasing consistently with both thickness and frequency.

Tested by: Dept. of Mechanical Engineering, IIT Kharagpur · ASTM E2611 & E1050 · November 2025
Non-Toxic · Structural Efficiency
Zero VOCs.
Lightweight by Design.

Composed entirely of hemp shiv and natural lime, hempcrete emits zero volatile organic compounds — contributing to healthier indoor air from day one. At a tested density of 625 kg/m³, it is also significantly lighter than conventional masonry, meaningfully reducing the structural dead load on a building's foundation without sacrificing performance.

Density verified: Mahindra TERI Centre of Excellence, Gurugram · December 2025
Independently Verified · November–December 2025
All performance data is certified by India's leading scientific and engineering institutions.
Acoustic Testing — IIT Kharagpur
Dept. of Mechanical Engineering · Prof. A. R. Mohanty, PhD, FNAE · ASTM E2611 & E1050 · B&K 4206 Impedance Tube
Thermal Testing — Mahindra TERI Centre of Excellence, Gurugram
Report No. MTCoE-1202025001 · ISO 22007-2:2022 · Thermal Constant Analyser TPS
Request Test Reports
Hempcrete testing
01
Superior Insulation vs. Masonry

The tested hempcrete achieves a thermal conductivity of 0.22 W/mK — a figure that places it far ahead of the two most prevalent wall materials in Indian construction.

Hempcrete
0.22 W/mK
Clay Bricks
~0.65 W/mK
Standard Concrete
~1.7 W/mK

The practical advantage: A hempcrete wall within a timber frame acts as a monolithic envelope — delivering both structural infill and thermal insulation in a single layer, eliminating the need for separate insulation boards or cavity systems.

02
Thermal Mass — Where Synthetics Fall Short

Synthetic insulations such as glass wool and EPS achieve lower conductivity figures — as low as 0.03 W/mK — but their near-zero density means they carry virtually no thermal mass. They stop heat transfer but cannot store it.

Hempcrete's heat capacity of 0.300 MJ/m³K means the wall itself absorbs heat during peak temperatures and releases it slowly as the space cools — a phenomenon known as thermal buffering.

In India's climate context: This buffering effect is particularly valuable in humid tropical conditions. Rather than relying solely on HVAC to manage temperature swings, hempcrete walls act as a passive climate regulator — keeping interiors measurably cooler in summer and warmer in winter without additional mechanical load.

03
GRIHA Recognition — Built-In Green Credentials

India's Green Rating for Integrated Habitat Assessment (GRIHA) — the national green building standard — awards points for the utilisation of alternative materials derived from industrial or agricultural waste.

Hempcrete is made from hemp shives, a direct agricultural byproduct of hemp fibre processing. It is a textbook candidate for this criteria, offering developers and architects a measurable, documentable contribution toward green building certification with no compromise on performance.

For developers: Specifying hempcrete is not merely an ethical choice — it is a strategic one. Green building ratings carry increasing weight in India's premium residential and commercial real estate market, and hempcrete's agricultural-waste credentials are among the cleanest available.

04
Real-World Performance in Indian Conditions

A standard 300 mm hempcrete wall achieves a U-value of approximately 0.73 W/m²K. High-performance envelope systems — such as AAC blocks with mineral wool — can reach 0.22 W/m²K, a technically superior figure on paper.

However, in humid Indian climates, raw thermal resistance is only part of the story. Hempcrete's hygrothermal advantage — its ability to simultaneously regulate both heat and moisture — consistently delivers superior real-world comfort over systems that manage only one of these variables.

The distinction matters: In climates where humidity is as disruptive as heat, a wall that regulates moisture alongside temperature outperforms a wall that only insulates. Hempcrete does both — and does so passively, without additional systems, treatments, or maintenance.

Case Study

The Rajarhat Project

Kolkata · 2025 · Completed

Hempcrete Wall Insulation for Premium Sound Dampening

Arete's landmark project in Rajarhat, Kolkata marks the first proven application of hempcrete for interior acoustic insulation in Eastern India. The challenge: a premium residential space requiring measurable sound attenuation without compromising design integrity.

Our solution deployed hempcrete panels across key partition walls and feature surfaces, achieving significant sound dampening while delivering a texturally rich, naturally finished aesthetic that no synthetic material can replicate.

"The hempcrete walls have transformed the space entirely — the sound quality is exceptional and the natural texture gives the room a character I hadn't imagined possible. Arete delivered something truly beyond expectations."

— Client, Rajarhat Residence · Kolkata, 2025
Hempcrete panels at Rajarhat
Hempcrete Acoustic Wall · Rajarhat
Seating area
Seating Area · Acoustic Treatment
Media room
Media Room · Full Wall Application
Hempcrete texture
Hempcrete Texture Detail · Natural Finish
↓38%
Sound Transmission
100%
Bio-Based Materials
Zero
Synthetic Chemicals
Net −
Carbon Footprint
What We Do

Our Services

End-to-end hempcrete interior solutions — from material consultation through to final installation — for residential, commercial, and hospitality projects.

Hempcrete services
Hempcrete · Interior Applications · India

"From concept to installation — every wall tells a story of intention."

Arete delivers end-to-end hempcrete solutions for spaces that demand both performance and permanence — where ecology and design are not trade-offs, but complements.

Start a Project →
01

Acoustic Wall Applications

Hempcrete panel installation for measurable sound dampening. Ideal for home theatres, studios, luxury residences, and corporate meeting rooms seeking acoustic precision with natural aesthetics.

ResidentialCommercialAcoustic
02

Thermal Insulation Systems

Hempcrete wall systems engineered for thermal mass performance — keeping spaces cooler in Kolkata's heat and reducing HVAC reliance. A luxury upgrade with measurable energy savings.

Energy EfficientThermal
03

Feature Wall Design

Hempcrete's natural texture creates distinctive, tactile feature walls that serve as architectural statements. No two walls are alike — each carries the organic character of the material itself.

Interior DesignAesthetic
04

Material Consultation

Advisory services for architects, interior designers, and developers seeking to integrate hempcrete. We provide specification, sourcing guidance, and technical support throughout the design process.

ArchitectsDevelopers
05

Custom R&D Projects

Bespoke hempcrete applications for unique spatial challenges. From curved walls to complex acoustic environments, our team pushes the boundaries of what bio-based materials can achieve in Indian interiors.

ResearchInnovation
The People

Co-Founders
& Partners

Neena Dutta
Neena Dutta
Design & Development

16 years spent shaping interiors and sustainable habitats have given her an instinct for materials that don't merely fill space, but elevate it. She is the quiet force behind Arete's design philosophy, translating ecological intelligence into forms that feel effortless, necessary, and deeply human.

Anurag Periwal
Anurag Periwal
Design Innovator

With 12 years at the intersection of design and R&D, he transforms raw ideas into systems of beauty and performance. His work does not chase trends but anticipates them, merging spatial clarity with scientific nuance. Refined, precise, and uncompromisingly future-forward.

Krishanu Sanyal
Krishanu Sanyal
Strategy

A rare duality: the analytical discipline of a Chartered Accountant and the vision of someone who understands what sustainable enterprises must become. His expertise in financial architecture ensures that Arete grows with intention — ethical, stable, and strategically sound.

Insights

From the Journal

Thoughts on sustainable interiors, hempcrete innovation, and the future of conscious design in India.

Hempcrete future India
Hempcrete · Education

Why Hempcrete is the Future of Interior Insulation in India

India's premium interior market is ripe for a material revolution. Here is why hempcrete is the answer architects have been waiting for.

Coming Soon · Arete Journal
Rajarhat acoustic project
Case Study · Acoustic

Sound & Silence: What We Learned at Rajarhat

A deep dive into the acoustic performance data from our landmark hempcrete project — the numbers, the process, and what comes next.

Coming Soon · Arete Journal
Sustainable design Kolkata
Industry · Kolkata

Sustainable Design in Kolkata: A Market Ready to Grow

From New Town to the city's heritage precincts, Kolkata's architects are beginning to ask harder questions about materials. Arete has the answers.

Coming Soon · Arete Journal
Sustainability · Net Zero · Healthy Living

Building for a
Carbon Negative Future

Every wall is a choice. Hempcrete is the only interior wall material in the world that actively sequesters carbon, regulates indoor air quality, and contributes to net-zero building targets — all while delivering premium acoustic and thermal performance.

−110 kg
CO₂ Sequestered Per m³

Carbon Negative by Nature

Hemp absorbs CO₂ as it grows and locks it permanently into the wall once set in lime. Every square metre of hempcrete installed actively reduces a building's carbon footprint — contributing directly to net-zero and carbon-negative construction targets.

Zero
VOC & Toxic Emissions

Healthy Living, Healthier Homes

Conventional building materials — synthetic insulation, gypsum boards, adhesives — off-gas VOCs that compromise indoor air quality for years. Hempcrete contains no synthetic chemicals, no formaldehyde, no petroleum derivatives. It is one of the healthiest wall materials available for residential spaces in India.

100%
Bio-Based Material

Circular, Renewable, Responsible

Hemp is one of the fastest-growing plants on earth — ready for harvest in 90–120 days, requiring no pesticides, and actively regenerating soil health. Hempcrete is a truly circular building material: grown from the earth, returned to it. The greenest choice is also the best performing one.

Net Zero · Green Construction · Sustainable India

India's path to net-zero construction begins at the wall level.

As India moves toward its 2070 net-zero commitment, the materials used in construction will define whether that target is achievable. Hempcrete is not a future solution — it is a deployable, tested, and commercially viable path to lower-carbon, healthier buildings today.

Carbon Negative Net Zero Ready GRIHA Eligible Zero VOCs 100% Bio-Based Healthy Living
Sustainable green construction India — net zero building hempcrete
Common Questions

Hempcrete in India —
FAQs

Hempcrete is a bio-composite made from hemp shiv and natural lime. In Indian interiors, it is specified as wall infill panels for acoustic insulation, thermal regulation, and decorative feature walls. It is carbon-negative, 100% VOC-free, and independently tested by IIT Kharagpur and Mahindra TERI Centre of Excellence.

Hempcrete achieves a thermal conductivity of 0.22 W/mK — 4× better than red clay brick and 5–8× better than standard concrete. It also sequesters ~110 kg of CO₂ per m³, produces zero VOC emissions, and delivers superior acoustic performance, making it one of the most advanced wall materials available in India today.

Yes. Arete Sustainable Synergies is based in Kolkata and serves residential, commercial, and hospitality projects across India including Mumbai, Delhi, Bangalore, Hyderabad, and Chennai. Contact us at contact@aretesynergies.com to discuss your project requirements.

Yes. Hempcrete is made from hemp shives — an agricultural byproduct — making it eligible for GRIHA points under the alternative materials criteria. It also contributes to thermal performance and indoor air quality credits, giving developers a measurable green building advantage.

Absolutely. Hempcrete's hygrothermal properties — its ability to regulate both heat and moisture simultaneously — make it particularly well-suited to India's climate. Unlike synthetic insulation that only manages heat transfer, hempcrete buffers temperature swings and absorbs excess humidity, delivering real-world comfort that outperforms conventional systems in tropical conditions.

Absolutely. Hempcrete's hygrothermal properties — its ability to regulate both heat and moisture simultaneously — make it particularly well-suited to India's climate. Unlike synthetic insulation that only manages heat transfer, hempcrete buffers temperature swings and absorbs excess humidity, delivering real-world comfort that outperforms conventional systems in tropical conditions.

Yes. Hempcrete is carbon-negative — it sequesters approximately 110 kg of CO₂ per cubic metre, meaning the wall itself offsets carbon rather than adding to it. Combined with its thermal efficiency (reducing HVAC energy consumption) and 100% bio-based composition, hempcrete is one of the most powerful tools available for net-zero and low-carbon construction in India.

Hempcrete contains no synthetic binders, formaldehyde, or petrochemical derivatives — emitting zero VOCs from day one. Its hygroscopic nature naturally regulates indoor humidity, inhibiting mould and bacteria growth without chemical treatments. For families, children, and health-conscious homeowners, hempcrete is among the cleanest and healthiest wall materials available in India.

Hemp grows in 90–120 days without pesticides, regenerates soil health, and absorbs more CO₂ per hectare than most crops or trees. Once harvested, the woody core (hemp shiv) is mixed with natural lime to produce hempcrete — a wall material that is 100% bio-based, biodegradable, carbon-sequestering, and durable for over 100 years. It is one of the most genuinely circular building materials in the world.

Let's Talk

Start a Conversation

We work with architects, developers, and homeowners who believe great design and ecological responsibility belong together.

Whether you're scoping a new project, curious about hempcrete specifications, or looking for a material partner — we'd love to hear from you.

Phone
+91 98369 42264
Location
Kolkata, West Bengal, India