FEATURE: MAPEI mortar brings life to National Shrine's mosaic dome of the enclosed compartment was six floors above the central aisle (known as the nave) and featured eight floors of scaffolding rising above the deck in the enclosed compartment to the dome’s apex, where the oculus marks 159 feet (48.5 m) above the nave. The work- site also included an air exchanger and ceiling cover to hide the instal- lation crew from the worshippers below and to avoid interruption of regularly scheduled services. MAPEI products on the jobsite All of the work was completed using MAPEI’s ANSI A118.15E- compliant Kerabond/Keralastic System. An installation of this kind required a tile mortar with a high- Installation of gold Venetian glass tiles on the dome