To create a waterproof barrier when installing Duramax PVC Panels, use waterproof caulk along the edges and seams to ensure a tight, secure fit. Apply the caulk to the joints between the panels and at the wall to prevent any gaps where moisture could seep through. This sealing method will provide a durable, waterproof barrier, making the panels ideal for high-moisture areas such as bathrooms, kitchens, and commercial spaces.