M Projects cold rooms use a tongue and groove polyurethane panel system that creates a weathertight, cold-bridge-free seal between panels. Standard panel thickness options are 42mm, 50mm, 75mm, 100mm, 125mm, and 150mm. Thermal properties are 25-30% superior to polystyrene and at least 70% better than mineral wool. The closed-cell foam is moisture-resistant, fire-retardant, and resistant to insects and rodents, making it suitable for food-safe and pharmaceutical environments.