This process involves placing the timbers in a sealed chamber, creating a vacuum, and then 'injecting' under high pressure to force the wood treatment deep into the grain of the timbers. This process will add many years to the life of your shed - which (for example) is especially useful if [once your shed has been fitted] it is difficult to re-treat annually (ie. your shed is in a corner, or close to other buildings or plants/ shrubs/ trees, etc.). Tanalised wood is highly resistant to rot, damp, and insect attack, making it a trouble-free and maintenance-free solution to all your general purpose outdoor storage requirements.