Hot tub lids can experience waterlogging if there is damage to the cover, exposing the insulating material. As a result, the water penetrates the insulation, causing waterlogging. The aging of polyethylene covers also breaks down the material barrier, causing it to turn permeable. After five to seven years of regular use, the water's chemicals start to leach into the polyethylene cover. This action allows water vapor to pass through the material and soak the insulation.