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Safety equipment


Other different types of hand tools often used include iron bars, pincers, jemmies, crowbars, fireman’s axes and cutting axes.


Special tools Amongst special tools used in such operations are sheet metal extractors, the jaws of which are tensioned over the sheet metal that is to be pulled down from the roof with the chain fitted in the tool, for example a lever. This works best on low roofs – if the sheet metal is securely fastened to the roof, it can be difficult to pull off from a high roof with the lever because the torque is excessive. To simplify removal on high roofs, the fixing screws in the sheet metal can be unscrewed. Explosive cutting frames are mainly used


to create openings in roofs with folded metal sheeting on tongue and grooved boarding. The blasting frame consists of a rigid cellular plastic frame, which can be mounted along with other frames, to enable the blasting of larger openings. The frame – which can be carried by one person and lifted through standard roof hatches – has a width of 0.6m.


A strip of plastic explosive is placed in


the frame with a directional explosive effect; a copper material then cuts through the roof, while foam plastic holds the component parts together, along with tape for adhesion to the underlayer.


32 MAY 2019 www.frmjournal.com


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