System and method for modular construction

A building comprising:

• at least one deck oriented in a horizontal plane;
• a plurality of prefabricated modules disposed above and below the deck, wherein the prefabricated modules each include horizontal top and bottom panels, and vertical side panels;
• a plurality of hollow structural members extending downwardly from around a periphery of each prefabricated module;
• a gasket disposed in areas between adjacent prefabricated modules, the areas including inaccessible locations, wherein the gasket includes an enclosure containing a first material and a second material comprising a two-part expandable foam;
• a manually actuatable mechanism including a separating element disposed within the enclosure that separates the first and second materials, the manually actuatable mechanism including an actuator member disposed outside the enclosure including a pull tab, the actuator member being accessible by a person outside the adjacent prefabricated modules, wherein when the pull tab is manually pulled the separating element is removed from between the first and second material causing the first and second material to contact each other and the two-part expandable foam to expand to be in sealing contact with adjacent panels of the adjacent prefabricated modules, thereby creating a seal between the adjacent prefabricated modules.