The aluminum flash coil for waterproof stairs is a distinctive material that offers efficient water protection in stairwells. The primary objective of aluminum flash coil for waterproof stairs is to prevent moisture and water from causing damage, ensuring the strength and longevity of staircases in various construction projects. Conveniently positioned within the stair interlayer during construction, this specially designed coil acts as a barrier to effectively prevent water penetration and protects against potential damage caused by moisture, leaks, or water seepage.