Jiafeng Mgo board is considered to be moisture resistant, but during prolonged exposure, moisture can affect it and it will experience hydrothermal expansion. When used outdoors, Mgo board should be covered or coated to protect it from the environments, the factory can do waterproofing before leaving the factory according to customer needs, such as adding waterproofing elements or sealing with UV paint. Normal mgo board water absorption is more than 20%. Waterproof mgo board waterproof meet less than 10% of water absorption.