Portable building and roof structure for it

A portable building comprising

• a plurality of interconnected building walls defining an interior space therebetween,
• a floor on which the building walls are positioned,
• a roof structure connected on top of the building walls, the roof structure comprising
• a top,
• a plurality of interconnected roof side walls defining an inner space between the roof side walls that is covered by the top, each roof side wall having an interior surface within the roof structure, and
• a support connected to and projecting inwardly from at least part of the interior surface of at least one of the roof side walls, the support for supporting at least one wire-like item,
• at least one wire-like item supported by the support,
• wherein the at least one wire-like item is from the group consisting of electrical or electronic wires, lines, conduits, and cables;
• and hollow tubulars,
• closure apparatus for enclosing a space defined by the support and the closure apparatus,
• a ceiling extending within and between the plurality of roof side walls beneath and spaced-apart from the top
• at least two building walls beneath the roof structure,
• each building wall having a top on which a support of the roof structure rests so that the at least one wire-like item is above the top of the wall,
• each of the at least two building walls is made from a monolithic single piece of material, and
• the floor is made from a monolithic single piece of material.