Hardiflex or gypsum board for the ceiling? | Home and Garden .. 10 Aug 2007 . am building my own house.. ano mas maganda sa ceiling, hardiflex or gypsum.. . I don't know about gypsum board, but it also seems like a "dusty" material like the above. . You need a metal furring screw. ... San Beda College · University of Santo Tomas · University of the .