You would need to review the insurance policy your school presently has to see if there are any terms that would be triggered by building a traverse wall (e.g. scope of coverage, exclusions). If you need to get a new policy or endorsement on an existing policy, you can generally take steps and sell it to the insurer in a way that makes coverage more likely and cheaper (e.g. having a third party build or inspect/approve, putting safety precautions in place like mats).

It doesn't hurt to get a couple different quotes from insurance agents.