Did any defendant breach its duty to Mr Richardson?
21Was the balustrade a structural component? This question is important because of Part 3.11 of the Building Code of Australia 1996. It specifies in Part 3.11.4 that the "design of...structural elements in a building must be in accordance with" - relevantly to this case - "AS1720.1-Timber Structures Code".
22Mr Richardson claims that the balustrade was not fixed in accordance with that code and there was a good deal of cross-examination of witnesses about their familiarity with that code. The engineer retained on behalf of Mr Richardson, Mr Allsopp, had no doubt that the balustrade was a structural component. At T349 he gave the following evidence when asked questions by Mr Gilbert -
"Q. What is meant by the term 'structural component'?
A. Structural component would be something that had to resist a specified loading.
Q. Is the balustrade subject to these proceedings, is that a structural component?
A. It certainly is.
Q. What is therefore the standard which is - can I say is the standard that's applicable to the installation of this balustrade?
A. That's AS1720.1."
23Mr A Cosentino was another engineer who was called on behalf of Mr Richardson. At T649 he effectively defined a structural connection as one which "will...transmit load". At T643 he identified the relevant code as AS1720.1.
24Mr R Nixon was a qualified builder who gave expert evidence on behalf of Mirvac. Mr Nixon agreed with the proposition that "a balustrade is not a structural component". He also said in ex 9 (D1), his report, at [146] that AS1720.1 is not the applicable code. But in cross-examination by Mr Gilbert at T568, he agreed that "a load-bearing component of the property is a structural component", that the balustrade in this case "was built and installed so it can withstand certain loads" and that "from [his] reading of 1720.1, that there are methods by which it should be fixed".
25Based on the evidence of Mr Allsopp, Mr Cosentino and Mr Nixon, I am of the opinion that the balustrade in this case was a "structural element" in the building and had to be designed in accordance with AS1720.1. I accept the opinions of Messrs Allsopp and Cosentino as qualified engineers in preference to the evidence of Mr Nixon, and I accept the concessions by Mr Nixon in cross-examination.
26But there is a further question about the interpretation of that code. It is illustrated by Mr Gilbert's cross-examination of Mr Nixon at T568. These two questions and answers were exchanged -
"Q. Now, where you differ with Allsopp and Cosentino further is that you take the view, don't you, that whilst you agree that the fastenings are inadequate, you are of the view that they can still be applied by a gun if they were adequate?
A. Adequate fixings could have been applied by a gun, yes.
Q. So you don't agree with the plaintiff's case that gun-driven fastenings are prohibited. You don't agree with that.
A. I don't agree with that."
27I also accept that the relevant joint in the balustrade is a type 2 joint. I think that to ask if the gun driven nails are "prohibited" by AS1720.1 is not helpful. The point is there are no allowances for other than nails "driven by hand only". There is a note which is in effect a warning about the use of gun driven nails. Clause 4.2.2.3(b) is prohibitive in terms. Clause 4.2.2.3(a) is not.
28In my opinion what clause 4.2.2.3 means, relative to this case, is that there were no specified withdrawal loads for the design of the joint because gun driven nails were used, but there was a warning that the withdrawal loads could have been "considerably less". The use of gun driven nails should put the installer and anyone else with responsibility for the stability of the joint on notice that there was a considerably increased risk of failure in the joint.
29Who then had responsibility for the stability of the joint? The installer, the third defendant, JMKG, obviously is one. Mirvac and WB Jones delegated the installation to independent contractors. As a general rule, a person is "not vicariously responsible for the negligence of an independent contractor" as Gleeson CJ said in Leichhardt Municipal Council v Montgomery [2007] HCA 6; (2007) 230 CLR 22 at 34 ([23]).
30It seems to be acknowledged that a person is under a duty to delegate to a competent independent contractor and that, to my mind, is consistent with the law. If WB Jones had reason to think that JMKG was not competent, then a breach of duty is acknowledged in [14] of Mr Cavanagh's written submissions "to exercise reasonable care in the performance of the work that it undertook". Mr Cavanagh says that all that WB Jones undertook was the manufacture of the balustrade. But it was also engaged by Mirvac to install the balustrade. WB Jones discharged that duty to an independent contractor JMKG. WB Jones was entitled to do that, but it had to be not just any independent contractor but a competent one. If WB Jones had reason to think that the independent contractor JMKG was not competent, then WB Jones could be in breach of its duty to Mirvac and to Mr Richardson. Similarly, if Mirvac had reason to think that any of its independent contractors was not competent, it could be in breach. I should add here that it appears that Mirvac did not know that WB Jones had subcontracted the installation to JMKG.
31In addition to duties to select competent independent contractors, did Mirvac and WB Jones have duties to inspect the work done to ensure it was competently executed? Mr Nixon's position, developed over T598 to T600, was that Mirvac was entitled to rely on its relationship with WB Jones without inspecting the installation of the balustrade, but he acknowledged at T601 that on the assumption that gun driven nails were prohibited and Mirvac knew they were used, then Mirvac would not have complied with its obligations.
32The cross-examination went further. Mr Nixon agreed (at T604) that "what gives a structural component its integrity is the piece of equipment holding it together". He agreed at the following page that "when Mirvac sent their document to Jones with no mention of the codes or standards, no request for an assurance or warranty, no request for a guarantee, and without any specification of the fastenings to be used, that indicated the builder was totally reliant upon the fact that Jones will get it right". He agreed over T605 - T606, speaking of Mirvac, that in "circumstances where they didn't inspect, if they didn't, or if they did inspect and were wrong about the fastening method, then the only protection that any person had was, Jones would get it right, he knows what to do." Mr Nixon said at T606 that it would be good practice for Mirvac to have specified the applicable building codes in the purchase order.
33Mirvac's senior employee called to give evidence was Craig Spriggs, a construction director. Other witnesses called on behalf of Mirvac were beneath him in the hierarchy. Mr Spriggs agreed with the following propositions in cross-examination by Mr Cavanagh over T820 - 821. A part of Mirvac's quality assurance program is to ensure the work of subcontractors is inspected. It is also to ensure that the work of each individual subcontractor is inspected when the work of that subcontractor is completed. Mirvac would ensure that the work of the specialist trade is inspected when completed. Mirvac has overall responsibility to the home owner to ensure that which it has agreed to give to the home owner is given. A way of doing that is by checking on and inspecting the work of its subcontractors to ensure that the work is performed to the appropriate standard, and that there are no defects or errors in the work of the subcontractor. If on inspection at the end of each trade's work, the work is not fit and done in a way Mirvac wanted it, Mirvac tells the subcontractor to fix it up or do it again. That would occur before Mirvac would allow another subcontractor to come in and, as it were, cover up any defective work. As a matter of almost certainty, if Mirvac was complying with its usual procedures and systems, the floor sheeting on the first level of Mr Richardson's home would have been inspected when it was completed by the floorer and before the gyprock placed in position. Any defects in the floor sheeting would have or should have been picked up by Mirvac. The reference to the floor sheeting is a reference to a gap which had emerged because of the misalignment of some of the structures in the flooring.
34When Mr Spriggs was cross-examined by Mr Gilbert he agreed that it was the total responsibility of Mirvac to ensure that the house was built in accordance with the relevant legislation, standards and codes, and that Mirvac expects subcontractors to maintain the standards. He also agreed that it was very important that subcontractors do everything in accordance with the rules. He agreed that it would be important to him that Mirvac people, as best as possible, ensure compliance with the standards and codes. He agreed that if there was something that Mirvac people were not sure about, they would have access to reference and codes if they needed to or to call the office and someone would reference those codes for them. Mirvac certainly wanted people to know all the Acts and the standards that they had to comply with, and the way that Mirvac satisfies itself about compliance with the code and the standards is by Mirvac's presence on the job monitoring, in so far as possible, the work done by the subcontractors, and as a trade moves on Mirvac wants to make sure that it is ready for the next trade. If a part of a component was covered up, Mirvac would satisfy themselves that what lay beneath was done properly.
35Mr Spriggs did not understand "specifically" the difference between type 1 and type 2 joints. That difference I should add is significant in this case because the reference which I earlier made to no loadings being given was in relation to type 2 joints. He agreed that in fixing a type 2 joint - a structural joint - it had to be properly and securely fixed to the structure and ensuring that that fixing was in accordance with the building code and the related standards was important. He agreed that apart from the noise made by gun installed nails being installed, he could tell from the visual inspection of a piece of timber before it was painted and decorated that a nail gun had been used or that a flat or a round headed nail had been used. He agreed that he would be able to tell from 2 metres away.
36I accept Mr Spriggs' evidence in preference to the evidence of the two other employees of Mirvac, namely Mr Whittaker and Mr Nightingale, on the issue of the appropriate conduct of Mirvac, its responsibilities and its liabilities. Specifically I find that Mirvac should have detected the poor craftsmanship in the laying of the floor on the first level. I find that the laying of the flooring and the fixing of the balustrade should have been inspected following on its completion and before concealment to make sure they were to an appropriate standard and contained no defects or errors. I find that Mirvac should have ensured compliance with relevant codes and standards by either certification or referencing themselves. I find that Mirvac could have seen that the fixture was made by gun driven nails by inspecting it. Whilst it was entirely appropriate for Mirvac to discharge much of its responsibility to Mr Richardson by engaging competent contractors, it is acknowledged by a very senior member of Mirvac's staff that Mirvac should have inspected the work of those contractors.
37I prefer Mr Spriggs' evidence on the question of inspection over Mr Nixon's assertion that an inspection was not needed because "that is what is in the industry". I accept Mr Catsanos' submission that retaining specialists is normal and appropriate for a builder, that the builder is not expected to look over the trades people's shoulders and that so far as Mirvac was concerned WB Jones was an excellent staircase installer.
38Mr Catsanos in his written submissions for Mirvac (at [25]) argued that there is a "dispute between the experts as to whether the balustrade was 'structural' and/or otherwise required the use of hand driven nails or whether, as Mr Nixon felt, it was non-structural and thus amenable to the use of fixings other than hand driven nails." He goes on to argue that it is therefore "hardly realistic to expect the builder to have an intimate knowledge of where and when it is appropriate to use nail hand-driven as opposed to gun-fired nails, particularly when there is controversy between the experts on the point.
39I do not think Mr Spriggs agrees with that. Nor do I. This was a particularly important component of the building so far as its occupants were concerned. Mr Nixon himself acknowledged the limits of his own expertise in interpreting the standard. Mr Allsopp had no doubt about the expertise needed to deal with the code. At T392 when it was suggested that the issue was really a difference of opinion he said the following: "You're saying that minds can differ. I'm a qualified structural engineer, Mr Nixon isn't. And I don't support his opinion at all. I think it's erroneous. It's completely at variance with the purposes of the codes." Mr Spriggs agreed (at T830) that it was "the total responsibility of Mirvac to ensure that that house is build [sic] in accordance with the relevant legislation, standards, codes" and (at T820) that "the way Mirvac "ensures that a home owner gets "a high quality house that is safe for use" is "by checking on and inspecting the work of its subcontractors to ensure that the work is performed to the appropriate standard."
40WB Jones subcontracted the installation to JMKG. I accept that WB Jones regarded JMKG as a competent installer. WB Jones regarded inspection of the final product as important but assumed that Mirvac would do the inspection. If it knew that Mirvac was not inspecting then WB Jones would "make arrangements" to inspect. Mr Jones, a principal of WB Jones, acknowledged that at T762. The arrangements would include "inspections, reports and call backs if necessary" (at T771). WB Jones maintained that "the actual inspections on the job were carried out by Mirvac" and "if I didn't hear anything I would assume that everything was okay". Mr Jones said that at T771. Because it had on site supervision WB Jones "took the view, and I understand your view was that you were alleviated from any further need to do inspections or anything like that". That was said by Mr Jones at T792. Mr Jones was not familiar with AS1720.1. That became apparent at T773. Nor was he familiar with a difference between type 1 and type 2 joints which became apparent at T775. Mr Jones was happy that the correct gun-fired nails had been used. The allegation against WB Jones in Mr Richardson's statement of claim included that it had failed "to conduct a proper safety inspection of the balustrade upon its installation".
41In my opinion WB Jones breached its duty of care in allowing the affixing of the balustrade by gun-driven nails. It was reasonable to delegate to JMKG because it had a basis for regarding it as competent, but WB Jones' wrong understanding regarding type 2 joints and the applicability of the code meant that in fact it failed to maintain a retain a competent contractor. It assumed that Mirvac would inspect. Mr Spriggs confirmed that and past practice with reports and callbacks made that assumption reasonable. Mr Allsopp confirmed that gun-drive fasteners were a deficiency. WB Jones also should have reported the gap, although it shared responsibility with JMKG. Mr Wilkinson, WB Jones' employee, must have seen the gap. Mr Cosentino regarded gun-driven nails as prohibited.
42JMKG as installer must bear primary responsibility for the failure of the joint. MFI 26 was a document which contained agreed facts by the parties. It recorded agreement by all parties that there was "general agreement by the experts" that "the nails used by the Third Defendant to affix the timber base plate were not: (a) of sufficient length; (b) of sufficient gauge". I reject the argument that it was simply a matter of Mr Nixon and WB Jones having a different point of view about the applicability of the relevant standard.
43I turn now to issue number 4.