Whether you should waterproof your foundation before selling your home depends on the condition of your foundation and the local real estate market conditions.

If your foundation is in good condition and there is no risk of water damage or moisture issues, then waterproofing may not be necessary. However, if your foundation has any cracks or signs of water damage, it may be necessary to waterproof it to prevent any further damage and to assure potential buyers that the foundation is in good condition.

In addition, if waterproofing is a common practice in your local real estate market and other homes in your area are being sold with waterproofed foundations, then it may be beneficial to waterproof your foundation as well to increase the appeal of your home to potential buyers.

Ultimately, the decision to waterproof your foundation before selling your home should be made after considering the condition of your foundation and the local real estate market conditions. It's best to consult with a local real estate agent or contractor to determine whether waterproofing is necessary and how it may affect the value of your home.