New York ( CNN ) -- Weather has delayed the scheduled Monday morning delivery of the final two sections of a 408-foot spire to the top of One World Trade Center , according to the Port Authority of New York and New Jersey . The two sections were scheduled to be delivered to the roof deck , as long as weather allowed on Monday . Once they are installed , they will make the building the tallest in the Western Hemisphere , according to the site 's management . The two pieces form a stainless steel beacon weighing almost six tons and will be the final piece put in place to give the building an iconic height of 1,776 feet , according to a news release from the Port Authority of New York and New Jersey . Once the architectural structure is complete , it will be comprised of 18 separate sections of steel and three communication rings . The first -- and heaviest -- steel section was installed in January , weighing more than 67 tons , the news release said . Port Authority Assistant Director of Media Anthony Hayes said the original design included a radome -- short for radar dome -- but that was rejected because of anticipated servicing and maintenance difficulties . The radome would not have impacted the height , but would have provided an additional design element , which ultimately proved impractical , Hayes told CNN . The spire will serve a television broadcast facility housed in One World Trade Center , the press release said . While under construction , One World Trade Center became New York City 's tallest building a year ago , standing 1,271 feet above street-level . The building then was 21 feet higher than the Empire State Building 's observation deck .
One World Trade Center will top out at 1,776 feet . Construction crews were scheduled to bring up final two sections Monday . Delivery delayed due to inclement weather . Comment: