Waterloo public school board makes masks mandatory for all students The school board said it would announce more details on Wednesday but there are expected to be medical exemptions to the policy.The province had previously mandated that students in Grade 4 and above were required to wear masks amid the coronavirus pandemic.[ Sign up for our Health IQ newsletter for the latest coronavirus updates ]A similar policy has been implemented by the public school boards in Waterloo and Toronto.Education Minister Stephen Lecce previously told Global News that the province supports local school boards making changes to support their needs.“Our plan is a living document — it is meant to be augmented and adapted, and we recognize that school boards.