You may not be able to do anything about weather or climate, but you can prepare for it. With advanced, high-performance DuPont™ Tyvek®—the protective material with more than 30 years of performance in millions of homes. Wrapping a home or building in a weather-resistant barrier is not just good sense, it's good building practice. Because it helps combat water, moisture and air infiltration that are any structure's worst enemies. Allowed to penetrate behind siding, wind-driven rain and moisture can saturate walls, creating a breeding ground for mold, mildew and wood rot. The properties of Tyvek® do not support the growth of mold or mildew. Air infiltrating from outside can create comfort-robbing cold or warm spots while increasing heating and cooling costs.