I will be putting down 1800 sq ft 4" unfinished Red Oak next week. I have heard some say to glue the boards to prevent cupping, others have said no worrys just use std 15lb paper on sub-floor. The house has a full 8' ceiling basement and is climate controlled. I would definately glue 5" or greater oak down but am leaning to just using std 15lb paper under the oak for this 4" install. Just curious to see what others would recommend.