Everyone knows pressure treated wood to be resistant to insect attacks such as termites, which degrades wood, but many people don’t know if pressure treated wood is waterproof. Although treated wood contains chemicals passed into the wood under high pressure, which makes it utterly resistant to biological attack by insects, even though pressure treated contains chemical preservatives, it is not resistant to water and moisture.
Hence, pressure treated wood has to be waterproofed by sealing agents that will form a protective coat over the wood’s surface. You can use various sealants such as varnish, polyurethane, lacquer, wood oils, etc., to waterproof your wood and make it durable enough to serve its purpose.
