In order to be level with hall, I need to raise the height of the floor by 1/2"-1" in a room in which I am going to be installing vinyl plank flooring.
Previously the room was carpeted so with the padding it was not as obvious a difference in levels.
The floor is concrete.
What are my options for bringing up the height of the floor ? Can I use foam board, or do I have to use Hardy Backer or DenseShield Or something else ?