How to build formwork

Tony
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How to build formwork

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Project Overview

Formwork is an important part of many concreting jobs. It is used to hold concrete in a certain shape while the mixture hardens. We’ll show you how to create a straight edge and a curved edge with formwork. 
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coloured concrete
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00:19
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Difference between cement and concrete

It is easy to get concrete and cement confused, but they are actually quite different. Cement is a powder that is one of the ingredients of concrete. Concrete is made up of cement, sand and aggregate. We compare the two so you can see the difference for yourself.

Step by Step Instructions

1 Make a straight edge with formwork
2 Make a curved edge with formwork
  • Step 1. Make a straight edge with formwork

    Use a shovel to level out the area you are planning to concrete. Then put a piece of formwork in the position you want for the edge of your concrete slab. Set the height of timber so that the top is level with the height you want for your finished slab. Then secure it in place by hammering wooden pegs on the outside edge of the timber
  • Step 2. Make a curved edge with formwork

    To make a broad curved edge with formwork, simply bend the timber into shape and peg it in place. If you want to make a tighter curve, do the job in stages. Start by pegging a broad curve in place. Then pour water over the timber to make it flexible. Once the water has seeped in, pull the formwork tighter and peg it down. Your final peg should go in at the centre of the curve. Once again, make sure the top of the edging is level with height you want for your finished slab.

Tools and Materials

Tools

  • Circular saw
  • Hammer
  • Square mouth shovel

Materials

  • Bucket of water
  • Jarrah edging timber
  • Wooden pegs
  • 5

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Health & Safety

Please make sure you use all equipment appropriately and safely when following the advice in these D.I.Y. videos. You need to be familiar with how to use equipment safely and follow the instructions that came with the equipment. If you are unsure, you may feel it is safest to consult an expert, such as the manufacturer or an expert Bunnings Team Member.

Grave health hazards are linked to asbestos, which may be in homes built up to 1990. Health hazards may result from exposure to lead-based paints in older materials and copper chromium arsenic (CCA) treated timber. For information on the dangers of asbestos, lead-based paint and CCA treated timber and tips for dealing with these materials contact your local council's Environmental Health Officer or visit our Health & Safety page. You can also use a simple test kit from Bunnings to indicate the presence of lead-based paint.
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