7 Key things you must know about concrete formworks

In concrete building, formwork, also known as shuttering, is a structural mold into which fresh concrete is poured and hardened. If you’re looking to use any concrete formwork material, then you should pay attention to this insider info often used by top formwork companies Sydney boasts of.

Here are few facts about concrete formwork that you should be aware of:

7 Key things you must know about concrete formworks


Concrete formwork building is a major undertaking that takes time and can cost up to 25% of the overall cost of the project. Fortunately, stripped concrete formwork may be reused, saving time and money. Reusable concrete forms are referred to as “column forms,” while non-reusable concrete forms are referred to as “stationary forms.”


Timber is the most often used material for concrete formwork in all building industries. The wood should be well-seasoned, light, easy to deal with, and free of loose knots. The disadvantage of using timber concrete formwork is that it can warp, but applying water-based treatments to the wood’s surface will help reduce this effect.


Concrete formwork may be made of steel, plywood, or fiberglass in addition to wood. These components may be used individually or in combination.

Steel is the most popular kind of concrete formwork used in heavy civil construction! Steel formwork is made up of panels made of thin steel plates stiffened at the edges by small steel angles. Panel assemblies are held together with clamps or bolts and nuts and can be mass-produced of any shape or scale. Steel formwork is heavier, more resilient, and lasts longer than wood formwork, and it does not shrink or warp.

Resin-bonded plywood sheets may also be used to make formwork. To make up the formwork’s panels, the sheets are fixed to timber frames. The cost of plywood formwork is equal to that of timber formwork, and in some cases, it is less so.

In cast-in-situ construction, such as slabs or ventures with angled walls, fiberglass consisting of precast concrete and aluminum is used.


A good formwork should be sturdy enough to handle all forms of loads while being as light as possible. To keep its shape, the formwork should be built rigidly and braced both horizontally and vertically. Similarly, the formwork joints should be strong against leakage and rest on a solid foundation.


Though formwork constitutes a large portion of the cost of a structure, these costs can be reduced. In order to reduce the cost of formwork:

  • The construction plan should have as few differences of room sizes as possible so that the formwork can be reused.
  • A building’s architecture should have as few slim portions as possible.
  • Wooden fragments can be sawed and sliced as little as possible so that they can be reused.
  • Formwork may be removed early in some cases.

Formwork may be removed earlier if the cement hardens quickly, if the weather is wet, and if the load is soft. Formwork can not be replaced until any of the concrete is proven to be capable of withstanding at least double the level of tension and strain that the construction is supposed to withstand. When removing the formwork, it can often be done progressively so that the load is gradually shifted to the concrete.


Steel concrete formwork has a large used demand due to its reliability and long working life. Contractors will make a lot of money by reselling concrete formwork after a project is completed. Purchasing recycled and surplus formwork for a project is another excellent way for builders to save money.

Until setting the reinforcing bars in their precise place, the finalized examination of the concrete formwork should be checked. By using ideal shape work, honeycombing, blow holes, grout less, or discoloration of concrete can be avoided, resulting in a superior finished surface of concrete.

7 Key things you must know about concrete formworks

Prior to beginning concreting work, the shuttering surface should be thoroughly cleaned and free of any defects or deposits in order to have a straight, smooth concrete surface. The surface of the shuttering does not have any degradation or undue roughness.

The following should be thoroughly studied when constructing concrete type work.

1. Any individual that may remain in place until the general dissolution is over should be perfectly labelled.

2. All relevant goods should be carefully tested to ensure that no faulty items/rejects are included.

3. Where there are excavations nearby, reformatory and reinforcing steps should be taken to effect the protection of shape work.

4. The bearing soil should be of high quality and well arranged, and the sole plates should bear well on the earth. Sole plates must be precisely positioned on their bearing pads or sleepers. Steel prop bearing plates should not be deformed. On the bearing members, sufficient bearing areas for the steel sections should be provided.

5. Adequate protection provisions should be in place to eliminate the effects of traffic, scour caused by precipitation, and unintended impacts.

6. Bracing, struts, and links should be given along with the progression of form work to ensure adequate strength and stability of form work at the intermediate level. Steel part tilting and overturning can be avoided.

7. When using customizable steel props, no disruption or obvious bends should be observed; steel pins should be arranged, with the latter being limited near either end.

8. Screw modifications on adaptable props should not be overdone.

9. When props settle/elastically shorten, double wedges can be used to correct the shape to the desired position. Wedges are only seen at the bottom end of a single prop which should not be too steep, and one of the pairs should be secured/clamped down after correction to prevent moving.

ten. There should be no quirky member over a vertical member.

11. An appropriate number of bolts, nuts, and cantilever supports should be present.

12. In multistage construction, props must stay immediately under one another.

13. Guy ropes and stays must be perfectly tensioned.

14. Provision should be made for the moving and function of the vibrator as well as other plant and machinery.

15. The necessary camber should be distributed over a wide variety of spans.

16. The supports must be adequate and plumb.

Final thoughts

Looking to always buy quality concrete formwork materials? This article just answered this question in precise details. With what we’ve discussed, you should know about concrete formworks and how to get them from the top formwork companies Sydney features.

Edward Gould