Is spray foam waterproof: Spray foam insulation is not inherently waterproof, but it can have some water-resistant properties depending on the type of foam used and its application. Closed-cell spray foam, which has a denser structure than open-cell foam, can provide a degree of water resistance due to its ability to repel water. When closed-cell spray foam is installed properly, it can create a seamless, continuous barrier that helps prevent moisture infiltration and air leakage.
However, it’s important to note that even closed-cell spray foam can be permeable to water vapor if it is not applied correctly or if there are gaps or voids in the insulation. Additionally, if the foam is damaged or if it is exposed to sustained moisture over time, it may lose its water-resistant properties and become susceptible to mold growth or degradation.
Therefore, it’s important to ensure that any areas where spray foam insulation is applied are properly sealed and protected from moisture, and to use additional measures such as vapor barriers or drainage systems as needed to prevent water infiltration.
