Abstract: The methods and apparatuses described herein include a data center having a three-level roof structure including an overarching rainfly roof to protect the data center from severe weather events. The three-level roof structure further includes a secondary roof structure below the rainfly roof structure as well as a lower redundant roof structure coupled together. A data hall within the data center has a ceiling below the lower redundant roof structure and is adapted to store a plurality of cabinets to hold electronic equipment. The lower redundant roof structure can be coupled with the secondary roof structure using an airtight seal such that the data center is airtight allowing for the data hall below to be positively pressurized to facilitate air flow through the electronic equipment. Heated air emitted from the electronic equipment is conducted through into a hot air return region above the data hall ceiling, while cold air is supplied to the electronic equipment below the data hall ceiling.