Due to the closed and consistent cell structure, FINNFOAM also functions as a vapor barrier. The insulation panels do not allow capillary movement of water, and it is not necessary to protect them separately against moisture or freezing at the construction site or during transportation. However, for end use, the panels should be protected from direct UV radiation.

The absorptivity of water in the core is the same as that of pure polystyrene’s, i.e., only 0.1% of volume. This has been verified with long-term immersion freezing tests. The test provides the best representation of the actual conditions in which frost protection is used. The long-term immersion test (size of test sample 200 x 200 x thickness) performed at TTY, in which the sample was also frozen occasionally (freezing at 2 month intervals), reveals actual differences in the waterproofing of frost insulation products. In terms of the freezing cycles, the test in question was significantly less demanding than testing conducted in accordance with the EN standard, but it was longer in duration. FINNFOAM ensures reliable frost insulation!