Building a sustainable future.

Deutsch English Nederlands Français

ISO-Stroh
Blow-In Insulation

Bio-based, certified, climate-friendly

ISO-Stroh is more than just insulation – it’s a commitment to ecological construction and a step towards a greener future.

Get Your Free Quote Today

ISO-Stroh: Redefining Green Construction

For centuries, straw has been a trusted natural building material. Yet, with industrialization and the rise of synthetic alternatives, this valuable resource faded into the background. Now, amidst the growing climate crisis, it’s time to bring straw back into the spotlight.

Discover ISO-Stroh – the insulation material of the future, rooted in the timeless wisdom of nature and designed for a sustainable tomorrow.

Why Straw?
Nature Already Knows

Straw is more than a byproduct of grain production – it’s nature’s wonder material:

  • High CO₂ absorption: 1 kg of straw captures approximately 1.5 kg of harmful greenhouse gas carbon dioxide.
  • Sustainably renewable: Straw grows back every year without requiring additional resources.
  • Completely biodegradable: A circular product that can be fully recycled or composted.
Straw as a building material

ISO-Stroh:
Straw Reinvented

Straw as a building material once faced numerous challenges: difficult processing, lack of stability, settling issues, and fire safety concerns. With ISO-Stroh, these problems are history. Our patented technology elevates straw to a whole new level.

Approved Building Product: ISO-Stroh is officially approved across Europe under ETA-24/0228, eliminating the need for individual approval.

Our Innovations in Detail:

  1. Perfect Structure: By splitting straw lengthwise and crosswise, we remove cavities, dust, and residual grain, resulting in dense, stable blow-in straw insulation.
  2. Unique Properties:
    • Blow-in Density: 105 kg/m³ for maximum stability and sound insulation (RW value 42, EN ISO 717-1).
    • Thermal Performance: λ 0.042 W/mK ensures excellent energy efficiency.
    • Outstanding Phase Shift: Provides optimal thermal insulation in winter and superior heat protection in summer.
    • Fire Safety: Fire Class E – exceptional for bio-based insulation. Tested by MA 39 Vienna according to EN 13501-1:2018.
    • Non-Corrosive: Protects structures without risk of degradation.
  3. Bio-Based and Safe: Naturally moisture-regulating, rodent-resistant, and flame-retardant, thanks to the inherent silicate content in straw – no chemical additives such as boron-based fire retardants required.
ISO-Stroh Application Fire Test

ISO-Stroh:
Building with Responsibility

Our Vision: Making sustainable building the new standard. ISO-Stroh is more than just a material – it’s an ecological revolution:

The Living Climate of the Future

ISO-Stroh transforms your home into a haven of comfort and sustainability:

  • Exceptional Thermal Insulation: Keeps you warm in winter and cool in summer.
  • Natural Humidity Regulation: Promotes a healthier, fresher indoor environment.
  • Outstanding Soundproofing: Enjoy the peace and quiet you deserve.
  • Breathable by Design: ISO-Stroh allows your walls to "breathe" naturally, enhancing indoor air quality.
Experience living with ISO-Stroh
Experience the future of living – with ISO-Stroh.

ISO-Stroh: The Building Material That Does More

Straw is more than just a building material – it’s a solution to the challenges of our time. ISO-Stroh blends tradition with cutting-edge technology, enabling environmentally conscious construction without compromise:

ISO-Stroh used in construction - example 1 ISO-Stroh used in construction - example 2 ISO-Stroh used in construction - example 3

Take the first step towards a greener future

Let us guide you on how ISO-Stroh can transform your construction project. Together, we can build sustainable, climate-friendly spaces – for you and for generations to come.

Make an appointment now

Reference Projects

Our customers use ISO-Stroh in a variety of projects, from building modern passive houses to renovating historic properties.

Reference Project 1: Modern Passive House Reference Project 2: Sustainable Renovation Reference Project 3: Eco-Friendly Extension Reference Project 4: Energy-Efficient Design Reference Project 5: Straw Insulation Retrofit Reference Project 6: Sustainable Architecture

Where to Buy

To minimize transportation distances and reduce environmental impact, ISO-Stroh is produced locally in your region. Find your nearest supplier below:

Location Map

Get in touch

Discover how ISO-Stroh can transform your project. Together, let's shape the future of sustainable construction!

Do You Have Any Questions?
We’ve Got the Answers!

Frequently asked questions (FAQ)

Blow-in technology is a highly efficient method for insulating building components quickly and seamlessly. Fibers are introduced into the structure using a precisely calibrated airflow at a defined pressure, ensuring a secure, dense, and uniform fill. ISO-Stroh stands out as the densest blow-in insulation material on the market. This not only delivers exceptional insulating properties but also provides the wall with remarkable heat storage capacity.

Sometimes, pictures speak louder than words...
Blow-in technology process
We offer our patented technology and processing plants to franchisees. Additionally, we’ve designed small-scale processing units for direct injection into components – perfect for carpentry businesses, module builders, and prefab house manufacturers.
ISO-Stroh is perfect for wall and floor structures, roof constructions, and insulation between rafters. Whether for new construction or renovating old buildings, ISO-Stroh offers versatility with EU-wide approval (ETA-24/0228).
Absolutely! ISO-Stroh is ideal for both new constructions and old building renovations. It is easy to blow in, reaches even hard-to-access areas, and requires no individual approval.
We are continually expanding our franchise network and produce ISO-Stroh locally in your region.
Contact us, we will connect you with your nearest distributor.
Absolutely! ISO-Stroh connects you with certified specialist companies to ensure the best results.
Get in touch with us today.
We organize free certification workshops throughout the year to teach craftsmen how to work with this revolutionary material.
Contact us and help build a sustainable future together!
Straw has been a tried and tested building material for centuries. With the climate crisis and a growing awareness of sustainable building practices, straw is gaining renewed attention. It binds CO₂, is sustainably available, and environmentally friendly, making it an attractive alternative to more climate-damaging materials.
ISO-Stroh undergoes a patented process where it is cut lengthwise and crosswise to remove cavities, dust, and residual grain. This results in an insulating material with high density, superior stability, and excellent thermal storage capacity, making it suitable for blow-in applications. Additionally, ISO-Stroh is officially approved under ETA-24/0228.
ISO-Stroh’s patented process splits the straw length- and crosswise to removes cavities and residual grain, creating a dense and uniform structure. It is compatible with standard blowing machines, ensuring gap-free cavity filling. The result? A certified blow-in density of 105 kg/m³ that guarantees settlement resistance.
ISO-Stroh’s natural silicate content makes it inherently flame-retardant. It has been certified with fire class E under EN 13501-1:2018 – an outstanding rating for a natural insulation material. While some insulation materials may offer higher fire resistance, none release fewer toxic substances during combustion than untreated ISO-Stroh. This crucial factor significantly enhances evacuation safety, yet it’s often overlooked.
ISO-Stroh’s diffusion-open structure naturally regulates moisture, leaving little opportunity for mold to develop. Without residual grain, it’s unappealing to rodents, and its high density combined with the lack of a food source effectively deters pests.
With its high mass, ISO-Stroh buffers temperature peaks, ensuring rooms stay cool in summer and warm in winter. Additionally, it naturally regulates humidity, creating a balanced and comfortable indoor climate.

Product reviews on YouTube

Explore detailed insights and reviews about ISO-Stroh:

Christina Ebisch about ISO-Stroh

By loading the video, you accept that data will be transferred to YouTube.

Der Fachwerker about ISO-Stroh

By loading the video, you accept that data will be transferred to YouTube.