Abstract: A shutter panel for use in a lost formwork for making a cavity floor. The panel has connection members for bearer feet. The connection members extend through holes in the shuttering panel. For marginal reinforcement of the panel around the holes, special fittings are provided, for example bracing plates, flanges or washers disposed against the underside of the panel. The holes in the shutter panel may also have an inside diameter such that the bearer feet can be passed through them from above at the time of fixing to fittings at the holes. The panel preferably consists of plaster.

Abstract: A cavity floor is formed by placing on a structural floor bottom a flexible floor mold which has leg forming portions arranged in an array with generally planar portions extending between and surrounding the leg forming portions. A flowable substance is applied over the mold, which subsequently hardens to form an upper floor having a plurality of legs defined by the leg forming portions, with a cavity region therebetween. The planar portions of the flexible floor mold permit adjacent leg forming portions each separately to contact the floor bottom under the weight of the applied flowable substance, even if the floor bottom is uneven.

Abstract: This disclosure relates to floor, wall or ceiling construction which includes a pair of plates having top and bottom surfaces and a relatively long peripheral side surface therebetween, each peripheral side surface including a first surface portion immediately adjacent each associated top surface, the first surface portions being disposed in relatively closed spaced side-by-side relationship to collectively define therebetween a relatively narrow guide groove of a predetermined width for receiving therein a cutting tool and of a length corresponding to the length of the peripheral side surfaces, each first surface portion merging with a second surface portion, the second surface portions being disposed in comparatively further spaced side-by-side relationship and the first surface portion is to define therebetween a relatively laterally wider adhesive-receiving channel, a cover across the top surfaces of the plate in spanning relationship to the narrow guide groove, an adhesive between the cover and the top s

Abstract: A heating system for an inhabitable enclosure having a first heating system that maintains a first temperature in the absence of persons in the enclosure and a second heating system that maintains a second elevated temperature using outside fresh air with control means to detect the presence of a person in the enclosure to energize the second system.