T&G Dungboard UC3 Treated 47mm x 200mm x 4.8m are ideal for using to create walls in buildings such as barns and sheds. The T&G boards are designed to interlock for a stronger wall that could be ideal for cattle and other livestock buildings. They allow for a degree of movement or adjustment with the effects of moisture. They have been treated to UC3 meaning that they are suitable for external use, above ground only.