I have to level some sagging floors in my two-story home on the 2nd floor which is one year old. The largest area is appoximately 5' x 6' - the sagging is from 1/2" to 1 1/2". Can I use a leveling compound on these areas? Two of the areas are carpeted and one is vinyl. What kind of complications may occur since we would be using this on the 2nd floor of our home? THANK YOU