Formwork
Sheet under review by our engineersFormwork refers to the molds, often made of wood or metal, used to give concrete its shape before it hardens. It's like the "cake pan" that will hold the concrete in place while it sets to its final consistency.
Why it matters for your home
Good formwork is essential for your concrete elements (beams, columns, slabs) to have the correct shape, dimensions, and a smooth, clean surface. Poorly made formwork can lead to deformations, concrete leaks, and weak or unsightly structural elements.
The African context
We often see poor quality, damaged, or poorly assembled formwork timber being used, leading to concrete leaks and rough surfaces. Formwork is sometimes removed too early, before the concrete has reached sufficient strength, causing damage.
Red flags
- ⚠ The formwork is not watertight and allows cement paste to leak out.
- ⚠ The formwork timber is warped, twisted, or in poor condition.
- ⚠ The formwork is not properly shored (supported), risking collapse under the weight of the concrete.
- ⚠ The mason wants to remove the formwork too quickly after pouring (less than 7 days for slabs/beams).
Questions to ask
- 1. "When do you plan to remove the formwork for the different elements?"
- 2. "How do you ensure the formwork is watertight and solid?"
- 3. "Have you provided enough props (shores) to support the formwork during pouring?"
Cost hint (indicative)
The cost of formwork can represent a significant portion (10-20%) of the cost of reinforced concrete work, as it includes labor and materials (which can be reused).
At this stage of your project?
An independent DiasporaBuild inspector can verify on site before you pay.