Treated timber is used in external and exposed applications where resistance to moisture, decay and insect attack is required. It is commonly specified for outdoor construction projects including decking, fencing, posts, pergolas and garden structures, as well as for ground-contact applications. Through pressure treatment processes, timber is protected against environmental exposure, extending service life in demanding conditions. Treated timber is suitable for residential, agricultural and light commercial use, supporting durable construction in areas subject to weather and moisture. Widely used in new installations and repair work, treated timber supports compliant outdoor construction when correctly specified and installed. It remains a reliable choice for builders and contractors requiring durable timber solutions for external structures and long-term performance.