Maaddadu waxay ka samaysan tahay H-beam-ballaaran heerka Ameerikaan ah oo leh heerka cabbirka ASTM A6.Heerka birta waxaa lagu dooran karaa inta u dhaxaysa ASTM A572 GR50 / GR60, ASTM A992 ama Q355.Galvanizing-ku-kululku wuxuu la kulmaa ASTM A123, ISO1461 iyo AS/NZS4680 heerarka.Dabcan, waxaan sidoo kale ku faraxsanahay inaan la kulanno heerarka tayada kale iyo dhumucda daahan HDG ee kala duwan ee macaamiisheena, maadaama ay dhaqankeena tahay inaan si dhakhso ah uga jawaabno baahiyaha macaamiisha oo aan isla markiiba u dhaqaaqno.Alaabada mustaqbalka fog ee shirkadda ee qeexitaannada guud ee alwaaxyada WF 2000 oo tan, si loo buuxiyo shuruudaha gaarsiinta degdegga ah ee macaamiisha.