Abstract: What is disclosed is a movable corner arrangement for a mould for forming at least one of the inner corner surfaces of a mouldable building module. The inner mould has an upper support panel for forming the ceiling surface of the building module and a plurality of movable side walls that depend from the upper support panel using flexible peripheral edge elements. The side walls have mould facing side wall surfaces movable to a position to form corresponding internal wall surfaces of the mouldable building module. The movable side walls are movable inwards and away from their respective formed internal wall surfaces to release the formed building module from the inner mould. A movable corner arrangement is used to form the internal corners of the mouldable building module located between adjacent movable side walls and includes a corner post and a corner post support coupling.

Abstract: This invention relates to modular building construction apparatus and in particular to a mould having movable framework used to construct a basic building module where any miss-alignment at the junction of framework elements is enough to make the imperfection noticeable. If the imperfection is a ridge it will be readily apparent on the inside surface of the formed building module and it will not be disguised by painting over it. What is disclosed is a movable corner arrangement for a mould for forming at least one of the inner corner surfaces of a mouldable building module. The inner mould for a mouldable building module has an upper support panel for forming the ceiling surface of the building module and a plurality of movable side walls that depend from the upper support panel using flexible peripheral edge elements. The side walls have mould facing side wall surfaces movable to a position to form corresponding internal wall surfaces of the mouldable building module.