Another myth circulating in the market. Pinka does not oxidize or shrink over time. The test standards necessary for parameter entries in declarations of performance take into account the effect of aging 25 years. The only thing that harms, and only the top layer of insulation, is UV radiation. Covering the foam with plasterboard completely protects it. The foam does not shrink, degrade or peel from the surface to which it was applied. Uncovering the walls after years, we can expect the insulation in exactly the same condition as on the day of application, which is an advantage over other insulation materials, such as wool, which tend to move and slip over time.