How can I ensure the waterproofing of a shower pan?

To ensure the waterproofing of a shower pan, you can use a waterproof membrane or liner underneath the tile or other surface material. This will help prevent water from seeping through and causing damage to the underlying structure. Additionally, make sure to properly seal all seams and corners to create a watertight barrier. Regular maintenance and inspections can also help identify and address any potential issues before they become a problem.