This experimental study examines the moisture absorption behavior of three bio-based construction materials, cork, timber, and bamboo, to determine their feasibility for use in flood-prone environments across refugee settlements. Globally, the construction industry is responsible for nearly 37% of greenhouse gas emissions, primarily due to the use of carbon-intensive materials. Climate change has not only driven extreme weather but has also disproportionately affected vulnerable populations, forcing them to relocate due to environmental instability. Refugee complexes require sustainable materials that can withstand extreme climate conditions while simultaneously providing a safe shelter for displaced communities. Bio-based materials, made from fibers and engineered wood, in contrast to inorganic mineral-based materials, are renewable, can store carbon, and offer other benefits, making them a viable alternative to carbon-intensive materials that contribute heavily to global warming. Material samples measuring 6 x 3 x ¼ inches were submerged in water over several days to measure moisture content. The findings suggest that bamboo and timber are better suited to flood-prone environments than cork, due to their moisture-resistance properties. By reducing the use of carbon-intensive materials in refugee shelters, it is possible to lower carbon emissions, promote climate-resilient materials, and support United Nations Sustainable Development Goals 9 and 11.