Factual background
8Although there was no pleading as to the nature and content of the duty of care, it was common ground that both Market Town and Pretti owed the plaintiff, as a member of the public having access to the shopping centre, a duty to take reasonable care for her safety. Most of the pleaded particulars of negligence were inappropriate or too generally expressed to be helpful. However, the factual issues identified in the course of the trial fell within a narrow compass. Both defendants accepted that the arcade was exposed to the elements and likely to become wet in rain. It was also accepted that the paving was liable to be slippery when wet.
9The judge accepted that, in April 2009, less than six months before the plaintiff's accident, "Pretti arranged and paid for the tiled surface at the exterior of the shopping centre to be painted with a paint that contained a non-slip additive and compound": judgment, p 14. The judge accepted that the exterior tiled area was "painted with a paint which included anti-skid assistant powder and a non-slip additive". (Whether the surface was "tiled" is doubtful, given Mr Pretti's evidence noted below; why Mr Adams described it as such was not revealed in his report.)
10The plaintiff did not contend that the steps thus taken were inappropriate: rather, she raised questions as to whether -
(a) the use of non-slip products was an adequate precaution;
(b) the whole of the relevant area was painted, and
(c) the paint had deteriorated over the period of six months, so as to require a further coat or replacement.
11Pretti was able to produce the invoices for the work done in April 2009, so that the actual products used were known. There was no criticism of the use of those products, assuming that painting was an adequate response to the known risk.
12The plaintiff's case turned upon an expert report prepared by Neil Adams and Associates, who described themselves as "safety management and ergonomics consultants". Mr Neil D Adams visited the premises on 17 December 2009, with the plaintiff and her solicitor, took photographs and made measurements of the slip resistance of the floor in the area where the incident occurred. Mr Adams described his findings in the following passages:
"The walkway surface immediately adjacent to the ATM, and extending further to the east, is lightly textured - consistent with having been painted relatively recently with a product that incorporated a non-slip additive. However, the adjoining area where Ms Pavlis slipped was significantly smoother, particularly hear the heavily trafficked centre of the walkway and close to the edges - consistent with having been painted some time ago with a product that incorporated a non-slip additive that has since been significantly worn away ....
...
I measured coefficients of friction on the walkway after wetting it with clean water. ... I made measurements in five different locations, and with the pendulum swinging in different directions. As those measurements were made within only about two months of the incident, it is not necessary to consider the issue of potential surface wear. The measurements that I made (see Table 1) reveal a high level of uniformity between the different measurement sites."
13Mr Adams was of the view that, although the current Australian and New Zealand Standards do not specify certain coefficients of friction as being "safe" or "unsafe", the table of "wet pendulum results" contained in AS4663:2004 indicated that, on the readings he obtained, the surface would be classified as providing a "high" notional contribution to the risk of slipping when wet with water. (In fact, the average reading of 33BPN was close to the margin between "moderate" and "high", although it was common ground that the slope of 5 degrees increased the risk of a slip.) Mr Adams acknowledged that:
"While it is not appropriate to infer that a surface is 'safe' or 'unsafe' solely on the basis of measured coefficients of friction, because the likelihood of pedestrians experiencing slips on a surface is only partly dependant [sic] on the surface characteristics, it is possible, usually by undertaking objective measurements, to determine the relative contribution that a given surface might be expected to make to the overall risk that a slip might occur. The total risk that a slip might occur on any given surface is dependant [sic] both on the frictional characteristics of that particular surface, as well as on a range of contributing factors, including: the presence of potential lubricants (eg water), footwear ...; pedestrian awareness of the level of available friction; whether the pedestrian is turning or exerting other forces on the surface; other aspects of gait; lighting; differentials between adjacent surfaces; and others."
14That Mr Adams declined to make any allowance for the period of nine weeks wear between the time of the accident and when he conducted his measurements provided a dilemma for the plaintiff. If the relevant surface had been painted some 25 weeks before the accident, it is not clear whether Mr Adams would have made any allowance for deterioration in the surface over that period. Thus if the painting was an adequate response to the perceived risk when undertaken, the lapse of time was immaterial. (There was other evidence to that effect.)
15The defendants obtained a report from Dr John Cooke, a consultant architect. Mr Cooke did not carry out his investigations until 23 November 2011 (proceedings not having been commenced until 2011). He relied upon further tests carried out by Mr Strautins in June 2011 which reported a reading of 35BPN under wet conditions. Dr Cooke accepted that Mr Adams' results would have more accurately reflected the level of slip resistance at the time of the incident than his own, but there was no evidence as to the likely margin of error.
16Dr Cooke agreed that the surface should have been treated with a material resulting in a "low" notional contribution to the risk of slipping, and that the surface should have been regularly checked. Dr Cooke had access to information about the products used when the surface was painted in April 2009, which he described as "a reasonable preventative measure." He was also of the view that the adequacy of the surface should have been checked "at regular intervals of about six months."
17The trial judge considered this material with some care. She accepted that the defendants would have appreciated the risk of slipping on the "tiles" when wet, and for that reason had arranged to have the tiles painted with non-slip additives in the paint. She did not, however, accept that the defendants knew or should have known that, having been painted, the area remained dangerously slippery when wet. She noted that there was "no evidence that anyone had slipped in that area, either before the plaintiff's accident or since": judgment, p 15.
18The possibility that the whole of the area had not been painted in April 2009 was also addressed. The trial judge noted the somewhat vague suggestion of Mr Adams that part of the area had been painted "relatively recently" and that the area where the plaintiff slipped had been painted "some time ago". However, she accepted the evidence of Mr Pretti who had supervised the painting that the whole area had been painted in April 2009. Although the experts were not cross-examined, Mr Pretti was. He was asked about the area near the ATM machine. Mr Pretti's evidence-in-chief included the following, at Tcpt, p 106(35):
"Q. Do you recall in 2009 speaking to a company about doing some work on an area of floor outside the entrance to the shopping centre?
A. The whole pathway area.
Q. When you say the whole pathway area is that an area that goes - that includes the front of the shopping centre?
A. It does.
Q. And can you recall at the time before the work was done ... was it a tiled area or some other substance?
A. No, not tiles, concrete - concrete pattern."
19In cross-examination the following exchange occurred, at Tcpt, p 111(46):
"Q. When you think about that ATM machine that was there and the work which was done on it in April 2009, can you remember -
A. The pathway.
Q. The pathway. Can you remember the work that was done? Did you watch it being done.
A. Not a certain area. The whole area. It was gurneyed and cleaned one night.
Q. Gurneyed and cleaned?
A. They gurneyed the whole area.
...
Q. And then what was done after that?
A. The next day they put a coat on the paint [sic].
Q. So they painted the surface after it had been cleaned?
A. With a roller. Yes.
Q. And you saw them applying that with a roller?
A. Yes I did."
20It was not expressly put to Mr Pretti that any area of the arcade or pathway was not painted, but it was in any event clear from his evidence that the whole area was painted. It also appeared from Mr Pretti's evidence that the area had not previously been painted with non-slip paint. Nor was it correct to say that there were tiles underneath the paint: Mr Pretti was clear that it was patterned concrete.
21The photographs certainly supported the view that the paint had worn or been chipped in some areas to a greater extent than in others. However, the evidence was silent as to when that had occurred.