Climate-Adaptive Floating Infrastructure

Architecture that
rises
with the water.

Crossfloat engineers hybrid floating platforms — concrete foundations permanently below the waterline, sustainably sourced timber above — the structural basis for buildings that self-adjust to sea level rise by physical principle, not by retrofit.

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Global mean sea levels are rising at 3–4 mm per year. Urban land is running out. Crossfloat gives architects and developers the structural foundation to act on that evidence — without compromising performance, sustainability, or ambition.

Source: Journal of Water and Climate Change, 2025 — floating development as a direct tool for securing living space while adapting to climate risk.

The Crossfloat System

A hybrid floating system, engineered from material logic.

Crossfloat places concrete where it performs best — permanently submerged, in the exposure condition where its long-term durability is strongest — and timber where it performs best: above the waterline, protected from direct water contact. Neither material is asked to perform outside its range. Because the timber superstructure is lighter than a concrete or steel equivalent, it also reduces the size and material demand of the pontoon below. The carbon benefit operates at the system level.

~40%
Average embodied carbon reduction — CLT vs. structural steel or concrete
Journal of Building Engineering, 2022
0.9t
CO₂ stored per m³ of CLT
The superstructure as an active carbon repository
100yr
Concrete pontoon service life in permanent freshwater immersion
Among the most durable configurations in construction
50+
Year design target for the timber superstructure
With appropriate moisture detailing and maintenance
Crossfloat floating module — concrete pontoon with timber superstructure

Core Module

Concrete Pontoon + Timber Superstructure

Four engineering principles. Each one evidenced.

Every claim we make about the Crossfloat system is grounded in peer-reviewed research, published LCA data, and documented construction practice.

01

Sustainable by Design

A CLT building LCA review found an average 40% embodied carbon reduction versus structural steel or concrete. Each cubic metre of CLT stores approximately 0.9 tonnes of CO₂ — locked in for the building's service life. That carbon storage claim is credible only when timber is designed for reuse: design for disassembly is not optional, it is what makes the number hold.

02

Truly Modular

Off-site prefabrication delivers up to 50% reduction in construction time, 10–20% cost reduction, and up to 22% lower construction-phase emissions versus conventional build. Modules are manufactured in parallel while mooring infrastructure is prepared — compressing the overall programme. One firm caveat: modular decisions must be made at early design stage.

03

Certifiable & Compliant

Permanently moored floating buildings fall under Dutch building law (Bbl) as structures, not vessels — subject to the same structural safety, fire, and health provisions as land buildings. A legal analysis by Blue21 confirms floating modular structures are already possible within current European frameworks. Navigating them requires expertise — which is what we provide.

04

Climate Resilient by Principle

IPCC projections range from 0.3 to more than 1.0 metres of sea level rise by 2100. A floating building self-adjusts to this change by buoyancy — no retrofit, no additional infrastructure, no intervention. A 2024 paper in Ocean and Coastal Management finds floating solutions have generally lower environmental impacts than land reclamation.

For Architects

Design for a material logic that places every element where it performs best.

Crossfloat integrates a concrete pontoon with a sustainably sourced timber superstructure: concrete permanently submerged in its strongest durability configuration, timber above the waterline following deflect, drain, and dry detailing principles. We provide full structural load data, buoyancy margin calculations, and direct technical collaboration from the earliest design stage — before you commit to structural geometry.

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For Developers

A defensible sustainability position. Backed by independently reviewed research.

Floating developments consume no land, self-adapt to sea level rise, and carry embodied carbon reductions documented in peer-reviewed LCA literature. Crossfloat provides the engineering foundation — and the technical documentation — to make these credentials bankable. The reference case is Schoonschip, Amsterdam: 46 households, circular resource flows, and a navigated Dutch regulatory path, recognised by TU Delft and Metabolic as a circular urban living lab.

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Sustainability

Carbon stored.
Land untouched.
Sea levels accommodated.

The built environment produces approximately 39% of global greenhouse gas emissions; 11% of that total is embodied carbon — from material manufacture and construction, before a building is ever occupied. Crossfloat's material strategy directly addresses this figure.

Timber stores approximately 0.9 tonnes of CO₂ per cubic metre of CLT — carbon absorbed during forest growth and locked in for the building's service life. Because the timber superstructure is lighter than a concrete or steel equivalent, it simultaneously reduces the size and material demand of the concrete pontoon below.

The net carbon benefit is real at the system level — even with a concrete foundation. End-of-life matters: if timber is reused, repurposed, or cascaded into other products, the storage extends. If it is landfilled or incinerated, the carbon returns. Design for disassembly is what makes the sustainability claim credible over the long term.

~40%
Average embodied carbon reduction vs. structural steel or concrete
Journal of Building Engineering, 2022 LCA review across multi-storey buildings
~0.9t
CO₂ stored per m³ of structural CLT
The timber superstructure as an active carbon repository for the life of the building
0m²
Land consumed — floating development leaves the ground beneath the waterway untouched
Lower environmental impact than land reclamation — Ocean and Coastal Management, 2024

Embodied Carbon Calculator

How much carbon does
your project save?

Adjust the parameters below. Results use published RICS benchmarks and Crossfloat's documented 40% embodied carbon reduction versus structural steel or concrete.

Total gross floor area
m²
50 m² 2,500 m² 5,000 m²
Building type

Baseline: 580 kgCO₂e/m² (concrete / masonry frame — RICS)

Estimates based on RICS embodied carbon benchmarks and the Journal of Building Engineering 2022 CLT LCA review. Figures are indicative — real projects require a full LCA. Contact us for a project-specific assessment.

Embodied carbon — tCO₂e

Conventional
—
—% less carbon
Crossfloat
—
—
tCO₂e saved vs. conventional
—
tCO₂ stored in CLT
—
Total climate benefit

That total benefit is equivalent to…

— return flights
AMS – JFK
— years of avg.
European car use
— trees absorbing
CO₂ for 10 years
process Get a Project-Specific Assessment →

How It Works

From feasibility assessment
to floating foundation.

01

Site & Feasibility Assessment

We assess your waterway, identify the competent authority — municipality, province, Rijkswaterstaat, or water board — and define both permitting tracks required: building regulation (Bbl) and waterway authority permit. Feasibility is established before design investment is committed. Early authority alignment is essential: administrative delays across multiple agencies are the primary timeline risk in floating development.

02

Design Integration

Our engineers work alongside your architects to establish pontoon geometry, buoyancy margins, freeboard calculations, and timber superstructure load paths. Material placement follows a defined logic: concrete permanently submerged, timber above the waterline with deflect, drain, and dry detailing. Modular configuration is fixed at this stage — switching to modular after design development negates schedule and cost advantages.

03

Off-Site Prefabrication

Modules are precision-manufactured in controlled factory conditions — weather-independent, waste-minimising, and quality-verified before shipment. Production runs in parallel with waterside infrastructure preparation, compressing the overall programme by up to 50% versus sequential on-site construction. Modules arrive with certified weight and load documentation, directly informing buoyancy and mooring calculations.

04

Launch, Assembly & Commission

Assembly on water typically takes weeks, not months. Utility connections, mooring systems, and structural commissioning are completed and independently tested before handover. The precision of factory production means tolerances are known before a module reaches the waterway — installation is verification, not discovery.

Aerial view of the South Korean coastline — the site that framed the research behind Crossfloat
South Korean coastline — the site that framed the question.

The Origin

Built from two continents
of research.

Joshua Karategin studied architecture across Germany and South Korea — two countries with fundamentally different relationships to land, water, and the built environment. Germany gave him the structural logic, material honesty and the rigour of building things that hold. South Korea gave him the question: coastlines under acute development pressure, waterways carrying the weight of cities with nowhere left to grow.

His master's research sat at the intersection of both. He focused on floating structures and emerging construction technologies — not as architectural novelty, but as a direct response to documented climate pressure. The IPCC projections were already in the literature. The sea level data was already there. What was missing was an engineered platform that treated water not as a threat to work around, but as a site to build on.

"The data was already there. What was missing was a platform to act on it."

Crossfloat is what that research became. A hybrid system placing concrete permanently below the waterline — in its strongest durability configuration — and sustainably sourced timber above it, where it can be detailed, maintained, and ultimately disassembled. Neither material is asked to perform outside its range. The carbon benefit is real at the system level. The climate resilience is built in by physical principle, not by retrofit.

Joshua Karategin
Founder & Architect — Crossfloat
M.Arch · Germany & South Korea

Ready to build on water?

Tell us about your site and programme. We will assess feasibility, identify the regulatory path, and advise on the right module configuration — before you commit to design development.

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