Need to ensure directory permissions stay set to 755

Need to ensure directory permissions stay set to 755. We have a program that stores files in /var/log/rederUI. I need the permissions to stay set on this directory to 755 so that internal service accounts can access world readable files in it. Vendor patches will change the permissions to be more restrictive so each time the server is updated, I have to reset permissions. I'd like to create a cron job to reset them to 755 anytime the restart is done. Though I know how to do this manually, what would be the best way to set it up in cron? Create a simple bash script to set the permissions and have cron run it? Is there a way to have cron only run a script or command at startup?