Building construction method

A method of constructing a building, comprising the following steps:

• a. constructing a floor remote from a final building location by
• i. constructing plywood sheets over floor joists;
• ii. installing plumbing pipes and electrical conduits between the floor joists;
• iii. injecting or spraying insulation foam or installing rigid insulation between the joists on a floor underside,
• iv. applying a water proof membrane over the floor underside;
• v. installing reinforcing bars on the floor underside over the membrane therein completing a floor;
• b. after step a, installing walls on the floor;
• c. after step b, installing roof framework on the walls over the floor;
• d. after step c, installing wallboard on the walls and roof framework forming at least one enclosed room with a ceiling;
• e. after step d, mounting at least a portion of the following directly onto the wallboard:
• cabinets, countertops, flooring, doors, trims and caseworks, electrical boxes, and bath fans, walls and/or ceiling;
• f. after step e, run and connect electrical wires, plumb fixtures, and install heating equipment;
• g. after step f, performing a functionality check of installed and connected items;
• h. after step g, spraying insulating foam to the walls and ceilings with pipes and wires embedded in the foam to avoid contact between them and concrete to be poured afterward;
• i. after step h, applying a waterproofing membrane outside of the foam on the walls and ceiling;
• j. after step i, installing reinforcing bars around the walls, plumbing pipes and heating conduits forming a prefabrication unit;
• k. after step j, moving the prefabrication unit to the final building location;
• l. after step k, the step of installing a foundation and external walls.