Method of covering a surface of a building and robot therefor

A method of forming an insulative covering on an internal surface of a building, the method comprising:

• introducing a robotic vehicle into an underfloor cavity of the building, wherein the underfloor cavity comprises a space between an underside of a suspended floor and the ground;
• spraying, by the robotic vehicle, a thermally insulating material in at least one layer onto the internal surface, wherein the internal surface comprises the underside of the suspended floor, wherein the robotic vehicle comprises a spray nozzle coupled to a hose that is coupled to a source of the thermally insulating material, and further wherein the source is located outside of the underfloor cavity;
• supplying, by the source, the thermally insulating material to the spray nozzle of the robotic vehicle via the hose;
• and
• allowing the thermally insulating material to solidify, wherein the solidified thermally insulating material forms the insulative covering of the internal surface.