Building systems, panel systems, and formwork systems, panels and formwork for building and methods of building using panels and formwork

A building system including a panel system and an associated removable formwork system, the panel system including a plurality of preformed modular panels arranged to fit with one another in a predetermined regular grid arrangement to form coextensive side walls of a building in a fitted condition, the plurality of preformed modular panels including one or more preformed straight panels and one or more preformed corner panels arranged to allow a change in direction between successive ones of the one or more preformed straight panels,

• wherein each of the one or more preformed straight panels and the one or more preformed corner panels include a front side, a back side, a bottom side, a topside, and opposing sides arranged to abut with an adjacent one of the plurality of preformed modular panels;
• wherein at least the bottom sides of each of the one or more preformed straight panels and the one or more preformed corner panels include a plurality of apertures that are arranged at predetermined spaced apart locations therealong so as to coincide with the predetermined regular grid arrangement, and
• wherein the one or more preformed straight panels and the one or more preformed corner panels are dimensioned such that the opposing sides thereof coincide with the predetermined regular grid arrangement thereby allowing junctions therebetween to coincide with the predetermined regular grid arrangement without in-situ modification of the preformed modular panels,
• wherein the back side of each of the one or more preformed straight panels and the one or more preformed corner panels includes a rebated portion skirted by a frame, the frame includes an inner side oriented toward the rebated portion and an opposing outer side, and the outer side of the frame includes a sealing arrangement,
• wherein the formwork system includes a plurality of modular formwork members that are adaptable to correspond to the plurality of the preformed modular panels, the plurality of modular formwork members each include a body adapted to form a rebate into a cast slab, the rebate being shaped to fit with the bottom side of a corresponding one of the plurality of preformed modular panels in the fitted condition, and
• wherein the body is adapted to carry void formers that are arranged to form slab apertures that are aligned with at least some of the plurality of apertures of the corresponding plurality of preformed modular panels,
• wherein the body is adapted to carry a seal that is released by the body so as to be retained by the slab in a cured condition when the body is removed, the seal retained by the slab positioned to be aligned with the sealing arrangement of the frame.