Strong by Form Raises €5.8M to Scale Woodflow Structural Composite

Updated on September 11, 2026 • 9 min read

Spanish deeptech company Strong by Form has secured the first €5.8 million closing of a planned €10 million Series A round, providing new capital to move its Woodflow technology from advanced prototyping toward certified structural applications in European construction.

The round is led by boisei investments, with participation from CMPC, VX Ventures, Ternel, Savia Ventures, Teampact Ventures, Axel Carbon, FINSA and several undisclosed family offices.

The funding will support manufacturing capacity in Europe, certification and market entry for Woodflow-core, a lightweight structural slab intended to compete with concrete and conventional mass-timber systems in long-span building applications. Initial deployments are planned with construction partners in Spain, France, Germany and Switzerland over the next two years.

For the composites industry, the more interesting story is not the fundraising itself.

It is the attempt to apply fiber-placement logic normally associated with advanced composites to wood, using computational design and digital manufacturing to place structural material according to load paths rather than distributing it uniformly throughout the part.

Woodflow Treats Wood More Like an Engineered Fiber System

Strong by Form describes Woodflow as a biomimetic manufacturing technology inspired by the way trees distribute additional material in regions subjected to higher loads.

Its process combines computational design, fiber orientation and proprietary digital manufacturing to place wood fibers where the structure requires them.

That makes Woodflow conceptually different from simply machining a conventional timber panel into a more efficient shape.

The material architecture itself is being engineered.

In conventional solid timber or many engineered-wood products, fiber direction is largely governed by the original tree or by relatively simple layer arrangements.

Strong by Form instead aims to control how wood reinforcement follows structural stress paths.

That philosophy will be familiar to composites engineers.

In CFRP, designers frequently orient continuous fibers according to principal load directions to avoid carrying unnecessary material where it contributes little structurally.

Woodflow applies a similar concept using bio-based reinforcement.

The Technology Has Already Moved Beyond Flat Panels

Strong by Form has demonstrated Woodflow across several geometries and applications, including bicycle structures, architectural panels, mobility components and rail interiors.

Its digital fabrication approach is intended to produce complex three-dimensional shapes rather than restricting wood composites to flat boards or conventional laminated forms.

The company won the Sustainability Prize in the 2025 JEC Startup Booster competition with a Woodflow bicycle application.

But the construction sector now represents the company’s primary scale-up target.

That shift matters because the economics of producing an individual high-performance mobility component are very different from supplying structural floor systems at construction-industry volumes.

Woodflow-core is intended to test whether the technology can move from specialized composite applications into industrialized infrastructure.

Woodflow-Core Targets the Concrete Slab

Strong by Form’s strategy is deliberately narrow.

Rather than attempting to replace an entire concrete or steel building system, Woodflow-core is aimed specifically at the floor slab, one of the heaviest structural elements in many buildings.

The concept allows the product to be integrated into hybrid structural systems while leaving other elements of the building unchanged.

This could reduce the adoption barrier compared with requiring developers or contractors to switch to an entirely new structural system.

Strong by Form says its Woodflow-core system can achieve spans exceeding 10 meters and compete with reinforced concrete on load-bearing performance while dramatically reducing structural mass.

The company’s current product page reports weight reductions of around 90% or more relative to reinforced concrete, while the Series A announcement describes the slab as approximately 80% lighter.

That difference likely reflects different reference configurations or evolving product data, so the figures should be treated as company-reported performance rather than universal values.

First 10-Meter Slab Moves the Concept Toward Structural Scale

Strong by Form has already manufactured a 10-meter Woodflow-core slab, an important step beyond small material coupons or demonstration components.

The company says the slab was developed to compete with concrete in structural applications while maintaining cost competitiveness.

Its current technical information lists spans of more than 10 meters for commercial and office applications, with longer configurations projected for residential and roof structures. The company says these figures are based on finite element analysis supported by physical testing.

However, Woodflow-core is not yet a fully mature construction product.

Strong by Form currently describes the system as TRL 6, meaning it remains in advanced prototyping and validation rather than broad commercial deployment.

That makes certification one of the most important uses of the new Series A funding.

Using Less Wood May Be as Important as Replacing Concrete

Strong by Form also argues that Woodflow can improve timber utilization.

The company says its strand-based system can use lower-grade wood and reduce wood consumption by up to 75% compared with traditional timber solutions in certain applications.

This is an important point.

Replacing concrete with timber does not automatically solve the resource problem if structural efficiency requires very large volumes of high-grade lumber.

As mass-timber construction expands, fiber efficiency and feedstock quality become increasingly important.

If a computationally designed wood composite can achieve required structural performance using less high-quality timber, the value proposition changes from simply “wood instead of concrete” to more structural performance per unit of biomass.

That is closer to the optimization logic already common in advanced composites.

Strong by Form Plans to Work With Existing Timber Producers

The company’s commercialization model is also notable.

Rather than attempting to build an entirely independent global manufacturing network, Strong by Form says it intends to work with established mass-timber manufacturers and existing industrial capacity.

This approach could provide a faster route to scale if manufacturing partners can incorporate Woodflow into existing production ecosystems.

Strong by Form argues that Woodflow-core could give mass-timber manufacturers access to applications currently dominated by concrete slabs.

The company estimates that this addressable market is many times larger than today’s mass-timber slab market, although those market-size claims remain company estimates.

Professor’s Analysis: Woodflow Is Really a Fiber-Steering Story

The obvious way to describe Woodflow is as a sustainable timber technology.

From a composites perspective, that misses the more interesting engineering idea.

Woodflow is fundamentally about fiber steering.

Advanced composites have long demonstrated that material efficiency improves when reinforcement follows the actual structural load path.

Carbon fiber is valuable partly because engineers do not need to use it isotropically.

Fibers can be positioned where stiffness and strength are needed.

Strong by Form is attempting to apply that same philosophy to wood.

Instead of treating timber as a uniform block, panel or laminate, the company treats wood fibers as a structural resource that can be distributed selectively.

That creates an important conceptual bridge between engineered timber and composite design.

The innovation is therefore not simply substituting a renewable material for a synthetic one.

It is using composite-style architecture to extract more performance from a natural reinforcement.

Certification Will Be Harder Than Demonstrating Strength

The 10-meter slab is an important milestone, but construction commercialization requires considerably more than proving that a component can carry load.

Structural building products must address long-term behavior.

That includes questions such as:

• creep under sustained loads,
• moisture and humidity exposure,
• fire performance,
• vibration and serviceability,
• connections,
• dimensional stability,
• durability,
• acoustic behavior,
• manufacturing variability.

For wood-based structural systems, moisture and fire behavior are particularly important because material properties can evolve with environmental exposure.

The supplied information does not yet provide a complete certification dataset covering these areas.

That is why the next two years may be more important than the prototype stage.

The technology has demonstrated that complex, load-oriented wood structures can be manufactured.

Now Strong by Form must show that they can be qualified, produced repeatedly and accepted by building codes, engineers and contractors.

Material Claims Need Full-System Validation

Strong by Form says Woodflow-core can compete with concrete and steel in structural performance while reducing weight and embodied carbon.

Those are potentially significant claims, but they need to be interpreted carefully.

A floor slab is not selected solely on material strength.

Concrete provides fire resistance, mass, acoustic performance, stiffness, vibration control and familiar integration with conventional building systems.

A lighter wood composite may reduce structural dead load and foundation demand, but designers must still address those other functions.

Likewise, environmental superiority should ultimately be evaluated across the complete system.

Forestry, adhesives, manufacturing energy, transportation, service life and end-of-life treatment all influence lifecycle performance.

Strong by Form currently describes Woodflow as carbon-negative and reports substantial carbon reductions, but full comparative conclusions should depend on project-specific lifecycle boundaries and independently validated data.

The Series A Is Really Funding Industrial Validation

The €5.8 million first closing gives Strong by Form resources to build European manufacturing capacity and move Woodflow-core through certification and early building deployments.

That changes the nature of the company’s challenge.

The question is no longer:

Can computational design make wood structurally more efficient?

The prototypes suggest that it can.

The harder questions now are:

Can the system be manufactured economically at construction scale?

Can different production partners achieve consistent quality?

Can it satisfy structural and fire codes across multiple European markets?

And can contractors integrate it without adding complexity elsewhere in the building?

If Strong by Form can answer those questions, Woodflow could represent something broader than another mass-timber product.

It could demonstrate that fiber-placement strategies developed in the composites world can be transferred to low-cost natural materials and deployed at building scale.

That may ultimately be the most important implication of the technology.