PVC pipe, known for its durability and resistance to a wide range of chemicals, is not easily damaged by salt (sodium chloride). This resistance makes PVC an ideal choice for plumbing systems, especially in areas with hard or saline water. Unlike metal pipes that can corrode when exposed to salt, PVC's non-reactive nature means it remains intact, ensuring a longer lifespan for your plumbing. However, it's essential to note that while salt per se will not damage PVC, extremely high temperatures or certain chemical combinations with salt could potentially affect the pipe's integrity. For typical residential or commercial use, including transporting saltwater, PVC pipes are an excellent choice due to their durability and corrosion resistance.

To insulate outdoor PVC pipes, start by selecting an appropriate insulation material. Foam pipe insulation is commonly used due to its easy installation and effective thermal protection. Measure the diameter of your pipes to choose the right size of insulation. For extreme conditions, consider using insulated pipe wrap in addition to foam sleeves for extra thermal protection. Begin installation by thoroughly cleaning the PVC pipes to ensure the insulation adheres properly. Carefully cover the entire length of the pipe with the insulation, making sure there are no gaps or exposed areas. Secure the insulation with durable tape, specially designed for outdoor use, to prevent it from unwrapping or water ingress. Regularly inspect your insulated pipes, especially before winter, to ensure they remain in good condition and provide effective protection against freezing.