Dutch Startup's Living Concrete Grows Moss on Buildings

What if the concrete walls in your city could come alive with moss, cleaning air and cooling streets without any watering system at all?

Respyre, a Dutch startup, has made that possible with Mosscrete, a bioreceptive concrete coating that creates perfect conditions for moss to grow on vertical surfaces. The moss pulls moisture directly from rain and air, no soil required.

The science behind it comes from Delft University of Technology. Since launching commercially, Respyre has applied the technology across eight buildings in Belgium and the Netherlands, each testing different real-world conditions.

Unlike traditional green walls that need structural support, built-in watering systems, and constant maintenance, Mosscrete works differently. Moss attaches through tiny thread-like structures called rhizoids that cling without damaging the surface beneath.

The coating can go on existing facades just as easily as new construction. That opens up blank or hard-to-reach walls where conventional planting would be impossible or too expensive.

In Kortrijk, Belgium, a new warehouse got 4,840 square feet of moss-ready coating during construction, paired with rainwater harvesting to keep it completely maintenance-free. A noise barrier in Hoofddorp is testing whether moss can grow on natural moisture alone, with the bonus that its porous structure may help absorb sound.

A social housing project in Purmerend became one of the first practical applications after traditional greening was rejected as too costly. That project helped Respyre figure out the best ways to design and apply bioreceptive facades.

In Haarlem, a commercial building combined Mosscrete with insulation to improve both greening and thermal performance. Research published in June 2026 found the cooling effect depends on moisture: wet moss cools through evaporation, while dry moss can overheat in direct sun.

Amsterdam is testing the coating on bridge piers where graffiti has been a problem. Moss-covered surfaces are less attractive to taggers, and the unirrigated site shows how moss develops under ordinary weather conditions.

The Ripple Effect

Most building materials resist change, staying sealed and gray for decades. Mosscrete does the opposite, improving as moss gradually takes over.

In dense cities, this kind of urban greening helps manage stormwater runoff and reduce heat island effects. Evidence suggests it supports local biodiversity too, giving insects and small creatures new habitat in concrete jungles.

A building slowly covered in moss doesn't look abandoned or neglected anymore; it looks like proof that something living can thrive even in the hardest urban spaces.