Water damage is one of the most common and costly problems in buildings, but the EPS Cement Sandwich Wall Panel’s unique structure is designed to completely resist moisture penetration. The outer fiber cement layers of the EPS Cement Sandwich Wall Panel are fully compacted and non-porous, so liquid water cannot seep through the surface even during days of heavy continuous rain. The closed-cell EPS core inside the panel does not absorb any water at all, even if you submerge the panel in water for 72 hours, the water absorption rate is less than 1% of its total volume. This makes the EPS Cement Sandwich Wall Panel perfect for use in high humidity areas like bathrooms, laundry rooms and even basement walls, where traditional drywall would quickly get moldy and rot. Unlike traditional brick walls that can hold moisture for weeks after a rain, any water that hits the surface of the panel dries in a few hours, with no trapped dampness left behind. When you combine the panel’s natural waterproof properties with proper joint sealing, you get a wall system that will never suffer from hidden moisture damage, keeping your building dry and healthy for decades.