Auckland homes with underfloor insulation benefit from an additional layer of protection against water and cold. Underfloor insulation in Auckland can be air-permeable, water-permeable, or a vapour obstacle, among other things. In order to prevent the floor from becoming wet and cold, the most popular type of underfloor insulation in Auckland is air-permeable insulation. When the floor does get wet, water-permeable insulation is employed to prevent further damage, but this insulation does a poor job of keeping out the cold.