Summary of Judgment

1. Introduction

The proceedings were an appeal to the Supreme Court of South Africa (Appellate Division) concerning the interpretation of a building contract and, in particular, the proper construction of an item in the Bills of Quantities dealing with the fixing of roof tiles.

The appellant was the Minister of Public Works and Land Affairs and the respondent was Group Five Building Limited. The respondent (as plaintiff in the court a quo) instituted action in the Cape Provincial Division seeking a declaratory order that the contract prescribed one method of fixing roof tiles (described in the manufacturer’s brochure as “method A”). The appellant opposed the claim and delivered a counterclaim for a declarator that the contract prescribed the alternative “method B”. Van Niekerk J found in favour of the respondent (method A). The appellant obtained leave to appeal pursuant to a petition to the Chief Justice and appealed against that decision.

The subject-matter of the dispute was the contractual meaning of the phrase requiring installation “alles streng ooreenkomstig die vervaardiger se voorskrifte” in a Bills of Quantities item for roof tiling, read with the relevant manufacturer’s brochure and the contract drawings, and whether that contractual scheme selected method A (normal headlap) or method B (greater headlap) for the roof tiles.

2. Material Facts

The parties concluded a building contract for the erection of an archive building in Cape Town on the site of the old Roeland Street gaol. As is customary, the contract comprised multiple documents, including the Conditions of Contract, the Bills of Quantities, and the Drawings. Clause 6(1) of the Conditions of Contract provided that all material and work shall be as described on the drawings and in the Bills of Quantities.

The dispute centred on a roofing item in the Bills of Quantities. Under the heading for roof coverings, the Bills prescribed the use of “‘Cordova’ of ander goedgekeurde groen geglasuurde klei dakteëls … soos vervaardig deur ‘Corobrick (Edms) Bpk.’”. The critical provision was item 157A, which specified clay roof tiles to a flat pitch, laid and fixed as described, “alles streng ooreenkomstig die vervaardiger se voorskrifte”, for an area of 4312 square metres.

It was common cause that the only information about tile size and overlap referred to by the phrase “vervaardiger se voorskrifte” was contained in a Corobrik brochure. The brochure gave the tile size as 406 by 203 mm, and set out two alternative methods of fixing tiles. Method A was described as appropriate under “normal conditions”, with a headlap of 102 mm. Method B was suggested for tiles “laid on a very low pitched roof and where extreme windy conditions prevail”, with a headlap of 203 mm. The greater headlap in method B would require more tiles for the same roof area than method A.

It was accepted that item 157A itself did not explicitly stipulate the overlap. The item referred to a “plat helling”, and the evidence indicated that this expression functioned to convey that the roof would not be steep and would not be difficult to work on, but it did not itself resolve which method (A or B) applied. On the evidence, it was also common cause that Roeland Street, Cape Town, could be regarded as a locality “where extreme windy conditions prevail”.

A further material feature relied on by the court was that the method of fixing tiles affects other building work, particularly carpentry, because tiles are fixed to wooden battens and batten spacing depends on the chosen method. The brochure stated that batten spacing was generally 305 mm centres for method A and generally 203 mm centres for method B.

The court relied on the fact that the Drawings formed part of the contract and were intended to be read with the Bills of Quantities. The tender documentation informed tenderers that the plans issued with the tender documents were not a complete set but served as a guide to indicate the scope of work and enable tenderers to familiarise themselves with the nature and extent of the works and how they were to be executed. Among the drawings were a section drawing and a roof plan (“dakplan”), both describing the method of fixing tiles in terms closely corresponding to item 157A, but additionally stipulating that tiles were to be fixed on battens at 203 mm centres. The court accepted that method A would be physically impossible where battens were spaced at 203 mm centres, and that this spacing aligned with method B.

3. Legal Issues

The central legal question was one of contractual interpretation, namely whether, on a proper construction of the contract documents (including the Bills of Quantities, the manufacturer’s brochure, and the Drawings), method A or method B was contractually prescribed for the fixing of the Cordova roof tiles under item 157A.

A further interpretive question concerned the contractual effect of the Standard System of Measuring Builders’ Work incorporated by clause B1.6 of the Bills of Quantities, and whether that incorporation entitled a tenderer to interpret the roofing requirements by confining attention to the roofing section of the Bills of Quantities alone, rather than considering other contract documents.

The dispute was therefore primarily about the application of interpretive legal principles to the contractual text and incorporated documents, rather than a pure factual dispute. Where factual matters featured (such as the windy conditions in Cape Town and the functional significance of batten spacing), they were treated as contextual facts relevant to interpretation, with certain aspects being common cause.

4. Court’s Reasoning

The court approached the matter by first identifying that the brochure, strictly speaking, did not contain binding “voorskrifte” in the sense of mandatory instructions, but was instead an informative document suggesting how the tiles might be used under particular circumstances. The brochure contemplated that the user would decide which method was appropriate, and in the present contract it was the architect’s duty to stipulate how the tiles were to be laid. Item 157A, apart from its reference to the manufacturer’s instructions, did not stipulate the overlap required.

The respondent’s argument (accepted in the court a quo) was that the interpretation exercise should be confined to item 157A read with the brochure, bolstered by the Standard System provisions requiring clear, complete descriptions in Bills of Quantities and discouraging the combination of trades within the same item. From this, the respondent contended that method A should be inferred as the “normal” method, and that if method B had been intended it should have been expressly stated.

The appellate court accepted that the parties had specifically incorporated the Standard System and that the Bills of Quantities were intended to be read in its light. However, it rejected the proposition that the Standard System could cure ambiguity. It reasoned that if an item in the Bills of Quantities is ambiguous, the Standard System cannot render it unambiguous; rather, the ambiguity indicates that the drafter did not meet the prescribed standard, and the ambiguity must be resolved by applying ordinary principles of contractual interpretation.

When item 157A and the brochure were considered on their own, the court did not accept that method A necessarily followed merely because it was described as applying under “normal conditions”. The brochure’s alternative method B applied where a very low-pitched roof and extreme windy conditions prevail. The court noted that item 157A referred to a “plat helling”, and while that phrase did not decisively indicate which method was intended, there was at least no indication that the roof was anything other than “a very low pitched roof”. Additionally, the evidence established that Cape Town could be regarded as extremely windy. In that context, the court concluded there was no sufficient reason—based only on item 157A and the brochure—to assume that method A rather than method B had been intended. The contractual text, read with the brochure, therefore remained ambiguous on the selection between methods A and B.

The court then considered whether the ambiguity could be resolved by reference to other contractual provisions, emphasising that the method of fixing tiles has consequences for carpentry because batten spacing depends on the headlap method. While the appellant relied on the carpentry section of the Bills of Quantities specifying battens at 203 mm centres (consistent with method B), the court did not find it necessary to decide the respondent’s argument that, due to the Standard System, one trade’s item should not be read with another trade’s items.

Instead, the court placed decisive weight on the fact that the contract expressly contemplated that the Drawings were to be read together with the Bills of Quantities. Clause 6(1) of the Conditions of Contract expressly referred to both drawings and Bills of Quantities as describing material and work. The tender documentation indicated that the plans served as a guide to the scope and mode of execution of the works, reinforcing their interpretive relevance. The court reasoned that it was implausible that a roofing specialist or tenderer would tender without determining from the drawings how the roof was to be constructed, especially given that the drawings formed part of the contract.

On the drawings, the description of the method of fixing the tiles corresponded closely with item 157A but additionally stipulated fixing on battens at 203 mm centres, which matched method B. The court found that method A could not physically be applied where battens are spaced at 203 mm centres. Accordingly, by reading the ambiguous item 157A and brochure together with the drawings (as part of the contract), the ambiguity was resolved in favour of method B.

The court addressed, and rejected as determinative, the respondent’s attempt to characterise the matter as a mere “discrepancy” to be dealt with under clause 6(2) of the Conditions of Contract (requiring the contractor to seek a decision from the owner’s representative upon detecting discrepancies). The court reasoned that since attempts to resolve the dispute had failed and the matter was before the courts under clause 27(2), the interpretive task was for the court. Applying ordinary interpretive principles, the court stated that a contract should, where possible, be interpreted so as to avoid discrepancies, and that this could be achieved by reading the contract documents together.

5. Outcome and Relief

The appeal succeeded. The order of the court a quo was set aside and replaced with an order declaring that, on a proper construction of item 157A of “Lys no 8” of the Bills of Quantities forming part of Contract No. 860109, the applicable method of fixing roof tiles was method B, described as the “B” method for a 203 mm headlap in annexure PPC3 to the plaintiff’s particulars of claim.

The respondent’s claim for a declarator in favour of method A (Claim A) was dismissed. The respondent (plaintiff in the action) was ordered to pay the costs of the action, including the costs of two counsel. The appeal costs were likewise awarded against the respondent, including the costs of two counsel.

Cases Cited

No external cases were cited in the judgment.

Legislation Cited

No legislation was cited in the judgment.

Rules of Court Cited

No rules of court were cited in the judgment.

Held

The Appellate Division held that item 157A of the Bills of Quantities, read with the manufacturer’s brochure alone, did not unambiguously select method A and remained ambiguous as between methods A and B. The incorporated Standard System of Measuring Builders’ Work could not remove that ambiguity.

Reading the contract as a whole, and in particular reading item 157A and the brochure together with the contract drawings (which formed part of the contract and stipulated batten spacing at 203 mm centres), the court held that the contract required method B (203 mm headlap). The court therefore granted a declaratory order in favour of method B, dismissed the respondent’s claim, and ordered the respondent to pay costs including the costs of two counsel.

LEGAL PRINCIPLES

A contractual incorporation of a measurement or drafting standard (here, the Standard System of Measuring Builders’ Work) means the relevant document (the Bills of Quantities) should be read in the light of that standard, but such a standard does not convert an ambiguous contractual provision into an unambiguous one. Where ambiguity remains, it must be resolved by applying ordinary principles of contractual interpretation.

In interpreting a contract consisting of multiple interrelated documents (such as conditions of contract, bills of quantities, and drawings), the interpretive exercise requires that the contract be read as a whole. Where possible, a court should prefer an interpretation that avoids discrepancies between contractual documents.

Where a contractual provision is ambiguous and other incorporated contract documents supply clarifying detail (such as drawings specifying construction requirements), those documents may properly be used to resolve the ambiguity, particularly where the contract contemplates that those documents are to be read together to describe the work to be performed.