FRP panel is ½” thick and requires wooden backer boards to support it. These panels absorb moisture from the environment, which can lead to dampness and mold formation. Rather, choose PVC panels that are inherently moisture-resistant. PVC panels have a non-porous and crevice-free surface and have an anti-bacterial coating to prevent bacterial and microbial growth. These panels have a shelf life of 100 years and come with a limited lifetime warranty. Shop from Duramax for factory-direct prices. Ask for a free sample now!