Grupo Dakatso will open a sargassum concrete plant in Tulum this Friday, July 3, betting that a material it calls sargacreto can turn the region's largest environmental problem into pavement, prefabricated blocks, and public works.
The science is settled. Sargassum can be turned into building material, and Dakatso has already done it. What remains open is the question of scale, whether one industrial plant can absorb a meaningful share of the seaweed that reached Quintana Roo in record volumes this year, or whether sargacreto stays a niche product for buyers willing to pay roughly ten percent more.
The opening, first announced for late June, is now set for 10 a.m. Friday at the plant on the Tulum to Playa del Carmen highway, near the Dos Ojos cenote.
From beach waste to building material
Sargacreto replaces part of the cement in a standard concrete mix with biochar made from sargassum through pyrolysis, a process that heats the algae without oxygen. Grupo Dakatso, the company behind it, says the result carries the same structural properties as conventional concrete and a service life measured in centuries.
David Jáuregui, a partner in Grupo Dakatso and the architect responsible for the plant, has said the company spent five years researching, testing, and certifying the material before treating it as commercially viable. He traces the company's work with the algae back more than a decade, including early public contracts for sargassum management in Playa del Carmen and Puerto Morelos, and containment barriers supplied to the Mexican Navy in 2019 and 2020.
The trade-off the company acknowledges is price. Sargacreto costs about ten percent more than traditional concrete. Its argument is environmental. The blend uses less cement, one of the most carbon-intensive materials in construction.
The Maya Train floor as proof of concept
The clearest evidence that the material works sit in Tulum already. According to Jáuregui, the entire exterior floor of the Maya Train station in Tulum, roughly 17,000 square meters, was built with sargacreto about two years ago. He has said the job used more than 15,000 tons of sargassum to produce around 1,800 cubic meters of concrete.
The company points to a second installation at the railway station in Campeche. Both are public, and Jáuregui has invited anyone to visit and judge the surface for themselves. That record is what separates this opening from a sales pitch. The product is in the ground and load-bearing.
The capacity question facing the Sargassum concrete plant
Here, the picture gets harder to pin down, and it is the heart of the story. The company has described the new plant's output in figures that do not line up cleanly.
In recent statements, Jáuregui put production at up to 400 cubic meters of sargacreto per day, served by a fleet of 15 trucks for public and private work. In an April announcement tied to its international agreement, he framed capacity differently, citing a ceiling of 5,000 cubic meters with an initial monthly target of 2,000. By his own ratio, each cubic meter requires about two tons of sargassum, so 2,000 cubic meters a month would consume roughly 4,000 tons.
Those numbers describe very different operations, and reconciling them matters because of what is happening on the coast. Tulum's 2026 sargassum season has broken historical records, a point Mayor Diego Castañón made this month when the state delivered new collection machinery to the municipality. Against that volume, 4,000 tons a month is a contribution, not a cure. The figure worth fixing at Friday's opening is the one the company commits to on the record, with a clear method for measuring it.
A United Nations validation that is still in progress
Part of the company's pitch rests on international credibility, and here the language deserves care. In April 2026, Grupo Dakatso signed an agreement with the Council for International Accreditation of Architecture and Design, an organization it describes as linked to the United Nations office in New York, to pursue validation of sargacreto. The company has said a delegation would travel to New York to advance that process.
A signed agreement to seek validation is not the same as a certificate already issued. Jáuregui has also stated that sargacreto holds certifications from national and international bodies, meets the applicable Mexican standards, and lets clients obtain documentation of the environmental benefit. The company reports collaboration with the Tecnológico de Monterrey and the UNAM to strengthen the scientific case, a trademark registered with IMPI, and a patent still in process. A bagged version for retail use, branded Sargamix, is in development.
One claim the opening could clarify is the full carbon picture, since pyrolysis itself consumes energy even as the blend cuts cement. Whether a third-party carbon audit backs the environmental claim is a fair question to put to the company.
Why do some say the fight starts at sea?
Not everyone frames land-based processing as the answer. Ignacio Muñoz, CEO of The Seas We Love, has argued that containing sargassum has to begin in open water, before it ever reaches the beach. By that logic, turning collected algae into concrete is a useful final link in the chain, not a solution at the source.
The distinction is not academic. A plant that consumes sargassum already on shore does nothing to reduce how much arrives, and the volume arriving is the part that overwhelms Tulum's beaches, its Zofemat crews, and its tourism economy each summer. Sargacreto answers what to do with the algae after collection. It leaves the harder problem, the arrival itself, untouched.
Friday's opening, a proposed avenue, and a trip to New York
The most concrete near-term test of demand is municipal. Grupo Dakatso has presented a proposal to pave or repave Avenida 7 Sur with sargacreto, a project Jáuregui believes could turn the street into a commercial corridor comparable to Fifth Avenue in Playa del Carmen. The company estimates the work could absorb up to 1,800 tons of sargassum. For now, it is a proposal, not a signed contract.
Friday's event will showcase the plant, the production process, and the colored prefabricated pieces the company has been promoting. The questions worth bringing are the ones the announcements have left open. Confirmed monthly capacity and how it is measured, where the sargassum comes from, who the committed buyers are, and the exact stage of the United Nations validation. Whether Sargacreto becomes Tulum's model for a circular economy or a premium niche will be decided by those answers, not by the ribbon-cutting.
Can a plant that turns sargassum into concrete keep up with a record season, or does the real fix have to start at sea? Join the conversation and share your perspective with us on Instagram and Facebook at @thetulumtimes.