This observation was qualified by their Honours' subsequent statement (also at 30) that:
"It is one thing to leave it to an independent contractor to decide for himself how to do his work; it is another thing to leave him in ignorance of a fact that is material to his decision if he, using reasonable care, might not discover that fact."
40 PPSC was an expert in the business of dismantling racking systems of the kind from which Mr Howell fell. Nolras had entered into a contract with PPSC where PPSC undertook to dismantle the racking system at the factory. The question therefore arises whether the water-affected shelf constituted a defect in the factory which PPSC, as an expert in dismantling racking systems, was accustomed to meeting and safeguarding its employees against. Put in another way, was it reasonable for Nolras to rely solely on PPSC and its employees, as experts in the field, to take appropriate steps to safeguard themselves against water-affected shelves and not warn them that rainwater had come in contact with the shelving.
41 Part of Mr Davis's work had been to replace damaged chipboard shelves found in other factories. He testified that he had previously seen chipboard that had been affected by water. He was asked, in evidence-in-chief, how, in the course of dismantling racking systems, he would determine whether a shelf was so water-damaged that it needed to be discarded. He explained that, in that event, the shelf would be removed so that could be examined. On closer inspection, he would look down "the edge" of the shelf as that would give "an indication as to the swelling". He said that that was "generally the only indication you can get". Mr Davis testified that, while damage to shelving caused by "usage" was a "visible thing", water damage could not be detected by ordinary inspection of a racking system. The tenor of his evidence was that the presence of a water-damaged shelf was not a surprising phenomenon.
42 Mr Davis agreed that in the course of his work he would not infrequently "come across racking systems which had been damaged in some way". This included damage to "the chipboard material used in the middle". He said that this was a common experience in his employment. When PPSC employees realised that a shelf was damaged they would have adopt a procedure different to the one they usually used. Mr Davis said, "We'd take an hour longer but we would deal with it."
43 The following exchange occurred in the course of Mr Davis's cross-examination:
"Q. It was quite common for pieces of chipboard to be damaged by water, is that right?
A. Generally if it was on the outside perspective, yes, but in a warehouse the only generally [sic] damages we look for are a usage damage [sic] and they're quite noticeably [sic]. You can see them quite well and truly.
Q. You say, generally, but they're occasions when the chipboard would be damage[d] wouldn't it?
A. From water damage? Yes.
Q. Inside the warehouse?
A. That's correct.
Q. Other than this occasion?
A. Yes."
44 I would interpose the comment that it seems from this exchange that chipboard could be used as shelving in racking systems that were "outside" and not under cover; this reinforces the proposition that some kinds of chipboard would be able better to withstand water than others (otherwise chipboard shelving could not be used outdoors).
45 Significantly, this exchange also confirms Mr Davis's other evidence that on occasions he would find chipboard shelving, used internally, that had been damaged by water.
46 Mr Davis confirmed that he knew that water-damaged chipboard shelving might be unable to support a person's weight. He accepted that one of the hazards of his occupation was that the shelves might have a defect "that couldn't be detected and may not support a weight". I have referred to the method adopted by PPSC employees to cope with such a hazard, namely, when walking on an upper shelf, they would traverse the shelf gradually, one step at a time, and would attempt to place their feet where the shelf was supported by the two central horizontal steel members. If they heard cracks or creaks they would stop and investigate. If they did not hear a crack or creak, they would keep going.
47 This does not appear to be a safe method of work, but it was adopted by PPSC and Nolras bore no responsibility for it. Nolras had contracted with PPSC to dismantle its racks and it was entitled to assume that it would take appropriate care for the safety of its employees, subject to any unusual or unexpected risks on the premises.
48 The evidence establishes that PPSC and its employees were accustomed to meeting and safeguarding themselves against the possibility of shelves being structurally damaged by water. The fact that water-damaged shelving may have been encountered relatively infrequently did not make the existence of such a defect unusual in the sense of being a fact that a PPSC employee, "using reasonable care, might not discover". Having to deal with a water-damaged shelf from time to time was not an unexpected phenomenon. It was simply part of the job which PPSC, as a specialist racking system dismantler, had contracted to undertake.
49 Therefore, in my opinion, in the circumstances of this case it was reasonable for Nolras to rely on PPSC's employees to take reasonable care for their own safety should they encounter water-affected shelving. In my opinion, a warning by Nolras was not a reasonable response to the risk of harm that should have been perceived by it. In my opinion, the principle expressed in Papatonakis applies.
50 Accordingly, I would not uphold Mr Davis's failure to warn argument.