The wooden framework is placed in a vacuum sealed chamber and high-pressure wood treatment is injected deep into the grain. This is Tanalisation, and will add years and years to your shed life! We highly recommend this shed range if it will be difficult to re-treat your shed. For example, if your shed is in a corner or next to trees and shrubbery. Tanalised wood is the ideal trouble-free solution to store your garden tools and equipment! It is maintenance free and comes with a 10-year anti rot guarantee!