Air termination network shall consist of a network of vertical and horizontal conductors generally as shown in the Drawings. All salient points of the structure shall be incorporated in the air termination network. All metallic projections, chimneys, ducts, gutters, vent pipes, guard rails, aerial masts, etc. on or above the main surface of the roof of the structure whether shown in the Drawings or not shall be bonded to and form part of the air termination network. Air terminals or vertical finials shall be provided if specified in the Drawings and/or Bills of Quantities. Unless otherwise specified, air termination network other than the air terminals or vertical finials shall be of 25mm x 3mm annealed copper tape. The method and nature of the fixing shall be simple, solid and permanent. The air termination network shall be secured to the structure by means of naval brass purpose made fixings with base phosphor bronze screws at the intervals not exceeding 500mm. Purpose made supports for securing the air termination network onto the roof tiles and ridge tiles shall be used. Bonding clamps shall be of gun-metal and purpose made.
In the case of metal cladding roof, the air termination network shall be secured to the metal roof structures by means of non-metallic purpose made fixings and supports of UV stabilised outdoor grade polypropylene material. Intervals between fixings shall not exceed 300mm.
Air terminals or vertical finials shall be of rounded end and made of copper. Unless specified otherwise in the Drawings and/or Bills of Quantities, they shall be of 300mm in length and 16mm diameter with lock nut. The base for supporting the air terminal or vertical finial on the flat surface or ridges shall be of gunmetal and purposed made. If portions of the structure vary considerably in heights, any necessary air termination network of the lower portions shall, in addition to their own down conductors, be bonded to the down conductors of the taller portions.


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