For supporting and insulating PEX water lines, it is recommended to insulate the pipe before securing it with clips. This approach is similar to the insulation methods used for copper pipes, despite PEX's unique characteristics, such as the need for UV protection. While copper and steel pipes can be supported over short runs without clamps, PEX requires periodic support with pipe clips. The insulation should be applied first, and J-hooks can be used for hanging, with notched joints glued for added stability. Additionally, there is a question regarding whether any insulation type provides UV protection, highlighting the importance of considering UV exposure when selecting insulation materials for PEX.