Macklanburg Duncan

Founded in 1920 by L.A. Macklanburg, M-D Building Products is a family-owned company renowned for pioneering innovations in home weatherization and comfort solutions. The company's journey began with the creation of the first form of weatherstripping, inspired by Macklanburg's frustration with dust and dirt entering under his door. This simple yet revolutionary idea sparked a business that continues to lead in quality and innovation. With more than 90% of its products manufactured in North America, M-D Building Products stands apart in its ability to maintain higher standards of quality control, respond faster to changing market conditions, and meet consumer demand with greater speed and efficiency. The company is committed to sustainability, engaging in initiatives to reduce its carbon footprint, including the installation of solar panels, upgrading to more efficient machinery, and converting to electric forklifts.