Wedi 16" x 16" Shower NicheWedi prefabricated niches are fabricated from 1 2 in. Building Panels for strength and come in several size options. The perfect fit for all your shower necessities, wedi niches install quickly and safely and integrate flush into the wall panel assembly with wedi fasteners and wedi sealant. Prefabricated construction, ready to tile and is 100% waterproof and mold proof Easy installation, no additional waterproofing required Installation over 2 x 4's