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Fencing Systems
Durable, low-maintenance solutions for residential and commercial use.
Backed by Techstars 2026
High-performance material made from macroalgae and recycled inputs, built to outperform wood in durability, consistency, and sustainability.
SeaLumber™ is an advanced composite engineered to replace traditional wood across construction, infrastructure, and outdoor applications. Manufactured from macroalgae, agricultural fibers, and recycled polymers, it delivers structural performance, durability, and consistency without the limitations of natural timber.
Designed for scalability and real-world use, SeaLumber™ enables builders, manufacturers, and developers to transition to next-generation materials without compromising cost or performance.
Performs in humid, coastal, and outdoor environments.
Unaffected by termites and biological degradation.
No sealing, painting, or replacement cycles.
Designed for extended use in demanding conditions.
Made using abundant biomass and recycled materials to reduce environmental impact.
Engineered for long-term performance in demanding residential, commercial, and industrial environments.
Designed for competitive pricing with reduced lifetime ownership costs through lower maintenance and replacement needs.
Helps reduce embodied carbon by utilizing biomass that naturally captures CO₂ during growth, locking that carbon into durable long-life products.
Collection and preparation of macroalgae (sargassum seaweed) or regional agricultural residues.
Biomass is refined and blended with recycled polymers to create a high-performance composite.
The composite is manufactured into durable profiles and panels at consistent tolerances.
A finished product ready for use across construction, infrastructure, and industrial applications.
SeaLumber™ is built from some of the world's most abundant and widely available resources, including macroalgae, recycled plastics, and agricultural residues. By adapting our material inputs to what is locally available in each region, we create a flexible, scalable solution that transforms regional waste streams into high-performance construction materials.
Massive sargassum blooms accumulate across the Atlantic each year, impacting coastlines and ecosystems. This abundant biomass represents a scalable, renewable input.
Plastic waste continues to build up in oceans worldwide, creating long-term environmental challenges. Recovered plastics can become durable, high-performance materials.
Agricultural byproducts are generated at massive scale across global farming systems. These underutilized fibers offer a consistent, widely available resource.
Plastic production continues to grow globally, creating both supply and waste challenges. Recycled polymers enable scalable manufacturing with less virgin material.
Durable, low-maintenance solutions for residential and commercial use.
Strong, consistent materials for supply chain applications.
Decking, furniture, trails, cladding, and exposed structures.
Versatile materials for building systems and prefabrication.
SeaLumber™ outperforms traditional and alternative materials by combining the strength and natural aesthetics of wood with the durability and low-maintenance benefits of modern composites, while delivering superior sustainability through abundant, recycled, and renewable inputs. Engineered for consistency, long lifespan, and real-world performance, SeaLumber™ eliminates the common tradeoffs between durability, appearance, cost efficiency, and environmental responsibility.
SeaLumber™ is a Techstars 2026 accelerator company. Alongside our industry and government partners, the program backs our push to take sargassum-derived composite lumber from pilot volumes to commercial manufacturing across the USA–Mexico corridor — connecting us to mentors, material scientists, distribution partners and capital at the pace the climate transition demands.
As sargassum continues to accumulate across coastlines, it presents both a challenge and a unique material opportunity. SeaLumber™ converts this abundant resource into durable, high-performance building materials designed for real-world applications.
Join our waitlist to receive updates, pilot opportunities, and early product access.
Techstars 2026 portfolio