Small church or church hall underfloor heating - has foam insulated electric heating elements above plastics trough under asbestos cement sheet

摘要

An under floor heating system for church halls, small churches, etc., uses large area flat electrical heating elements. These are supported on a layer of hard polystyrene foam housed inside a trough made of a PVC base attached to angle section PVC sides. The whole is covered by a heat distributor plate of asbestos cement. The load capacity of the foam material is about 3.5 kp/sq. cm. Between the heating elements and the distributor plate is a plastics foil sheet of e.g. polyethylene terephthalate. Between the distributor plate and the horizontal supporting flangle of the trough sides is a permanent elastic sealing strip. The conductor wires for the heating elements pass through holes through the angles forming the trough sides.