90x45 mgp10 treated is kiln-dried radiate pine, suitable for outdoor use as decking bearers and joists. Structural Treated pine is for external above ground structural use. Each piece of structural timber is treated for borers, termites and is able to be subjected to moderate wetting in a well ventilated area for up to 20 years. Please refer to your local building codes and regulations for required treatment types and levels. Common uses for Structural pine are decking sub floor, pergolas and fencing.