Do you have to purchase a burial vault for someone who was cremated to bury the ashes?

No, you are not required to purchase a burial vault for someone who was cremated to bury their ashes. Many cemeteries allow cremated remains to be buried directly in the ground or placed in a columbarium niche without the need for a vault. However, some cemeteries may have specific regulations or preferences, so it's best to check with the cemetery for their policies regarding the burial of ashes.