4.3 Formwork measurement rules
The measurement rules for formwork are detailed in Section 7 of the ANZSMM, which provides standardised guidelines for the quantification and pricing of formwork in construction projects. Both preamble notes and preamble items are provided in the BQs to serve as essential references for tenderers and quantity surveyors. The preamble notes direct users to relevant specification sections that outline the technical requirements for formwork construction. In addition, preamble items are included for engineer certification of formal design and for the preparation of shop drawings. This provision allows an appropriate allowance to be made for the design and documentation of the formwork system where these are not supplied free of charge.
Generally, formwork is measured by area and expressed in m². The standard classifies formwork for the faces of footings as either partially above ground or wholly below ground, depending on their exposure. Soffits of slabs are categorised based on their slope, with classifications for horizontal, slope not exceeding 15 degrees, slope exceeding 15 degrees, and permanently cambered forms. Similarly, formwork for the sides of columns, beams and piers is classified as either isolated or attached, and the sectional shape of the columns or piers must be clearly stated in the description. Where columns or piers are circular in cross-section, the formwork must be measured in linear metres (m) rather than m2, and their diameter must also be included in the description.
Additional measurement rules are provided in the classification table. For example, Measurement Rule 6 (M6) requires that each class of formwork be measured separately to ensure accurate itemisation for pricing purposes. For a more comprehensive understanding of the measurement procedures, pricing, and definitions, the authors encourage readers to refer Section 7 of the ANZSMM.
Item descriptions must also comply with the conventions set out in the standards. For instance, when describing formwork for the soffit of slabs, the strutting height must be stated. These descriptions should also align with the technical specifications relevant to the project. An example of an appropriate description for slab formwork can be:
“Provide Class 3 timber formwork for horizontal soffits of the slab, including strutting 3 m – 4 m high.”
