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Measurement of Concrete Formworks for Payment Calculation

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Measurements of concrete formwork (shuttering) is required for payment to the contractor for the concrete work completed. The payment to contractor depends on whether the cost is included with the concrete construction per unit quantity or formwork is paid separately, as mentioned in the conditions of contract.

How to Measure Formworks?

The formwork is measured in terms of area that is in contact with the concrete surface.

Parts of Formworks for Beams and Slabs

For example, the formwork for concrete footing will be calculated as the surface area of four sides of foundation only. Bottom of the footing is resting on earth, there is no need of any formwork and top of footing is open.

Plan and Elevation of RCC Footing

From the above footing plan and elevation, it can be seen that formwork area required will be

2 x (2 + 3) x 0.6 = 6 m2

Similarly, for a reinforced concrete beam, the measurement of formwork will be taken as the combined surface area of two sides and bottom of the beam.

Issues in Formwork Measurements

Deduction of formwork area should not be taken for:

Units of Formwork Measurement

Formworks are measured in terms of area. So any unit such as square meter, square foot, square centimetre can be adopted. But generally, square meter and square foot of the contact area with concrete is taken as the unit of measurement.

The dimensions of a formwork should be measure correct to the centimetre or inches whichever the case may be.

Formworks are measured as just contact area, not area of formwork, as shown below:

Contact Area = 2h(L+B)

The measurements of formwork are carried out separately for each type of concrete works such as following:

  1. Foundations, footings, bases of columns etc. and for mass concrete and precast shelves.
  2. Walls of any thickness including attached pilasters, buttresses, plinth and string courses etc.
  3. Suspended floors, roofs, landings, shelves and their supports and balconies.
  4. Lintels beams, girders and cantilevers
  5. Columns, pillars, posts and struts.
  6. Stairs (excluding landings) except Spiral Staircase
  7. Spiral staircases (including landings)
  8. Arches
  9. Domes, vaults, shells roofs, arch ribs and folded plates
  10. Chimneys and shafts
  11. Well steining
  12. Vertical and horizontal fins individually or forming box, louvers and bands
  13. Waffle or ribbed slabs
  14. Edges of slabs and breaks in floors and walls
  15. Cornices and mouldings

Read More:

Types of Formwork (Shuttering) for Concrete Construction

Plastic Formworks for Concrete – Applications and Advantages in Construction

Concrete Formwork Design Considerations – Basis for Concrete Formwork Design

Wooden Concrete Formwork Design Criteria with Calculation Formulas

Concrete Formwork Loads and Pressure Calculations

Concrete Formwork Removal Time, Specifications and Calculations

Formwork (Shuttering) for Different Structural Members -Beams, Slabs etc

Formwork Safe Practices Checklist

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