Lub qhov rooj hluav taws kub hlau yog ua los ntawm cov hlau galvanized, nrog cov txheej txheem oxide tiv thaiv thiab tiv thaiv ultraviolet txheej sab nraud. Cov khoom siv hluav taws kub steel yog sandwiched nrog ib txheej ntawm “perlite board,” lossis lwm yam khoom siv hluav taws xob, uas tuaj yeem cais qhov hluav taws kub thiab tiv thaiv kom tsis txhob muaj hluav taws.