Celestial-duskit’s twenty one pilots temp ty bean

Riddle time; You are in the only site keeping a deadly virus from infecting the world. The facility is a 4x4 building. Every room but the one you are in is infected. You need to enter each room and flip a switch to fill each room with cement. You have 10 seconds to escape the room. All infected rooms need to be filled. You cannot enter a room filled. How can you fill each room and get out with your life.