Merv,
Not sure why i can’t do anything after i pasted in that link. had to submit and start over couldn’t even edit it. Did something wrong 🙂
That is a link with the safe room requirments. and the next will be building codes which doesn’t have much in for tornado other than wind speeds. That would be under chapter 3 which is building planning then go to storm shelters and then click on the different stuff like wind load ETC.
https://up.codes/viewer/kansas/irc-2018
But as for further codes and recommendation you have to talk with every township for the actual requirements to see how hard it needs to be tied down . I never did a house in Kansas but the people i work with did one about a year ago. Some townships have a PDF with the requirements but sorry i don’t have one of those.
Conrad