Large Size Redwood Lean-To Pergola | Complete DIY KitTanalised, pressure treated heavy duty timber Lean To Pergola DIY Kit, manufactured from high quality redwood timber treated to ensure a 10 year warranty for rot. This version is our range of larger sized lean to pergolas with more than two posts. We have a great selection of pergola's and gazebo's, see the full Timber Pergola and Gazebo Range. This is our large size lean to range, we have our smaller size range of lean to pergolas if you need a