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How to Lay a Concrete Slab

How to Lay a Concrete Slab

A concrete house slabs Melbourne is an essential component of any home or building. Although its installation may be time- and labor-consuming, its benefits make the effort worth your while.

Before beginning to lay a slab, dampen the soil to prevent too much concrete from sucking up moisture from its surroundings and weakening it.


Once you have cleared and leveled the site, add a layer of gravel fill to create a solid base and compact or tamp it down before compacting further with compactors or rollers. Measure slope with builder’s level and string to make sure evenness. Adjust soil levels accordingly in order to correct it as necessary.

Start by installing a sub base made up of crushed rock and sand, either pre-mixed from a store or homemade from scratch. Make sure that it covers the area properly with dampproof membrane to avoid moisture seeping through and damaging the concrete.

At one end of your slab form, nail a line of 2×12 lumber to stakes driven into the ground at regular one foot intervals. Stretch a mason’s line over this section of 2×12 and line it up with each stake; cut and splice as necessary for longer stretches to act as braces for your concrete form after it has set up; finally hammer timber pegs at 100 cm intervals around its perimeter to secure it securely in place.


Before pouring, calculate how much concrete will cover both length and width of your slab to avoid running out during pouring – this helps avoid delays!

Clear the slab site of any obstructions to pouring, such as grass, roots, rocks and old concrete. If the site is large enough, trench digging might also be required.

Place form boards at the appropriate distance apart and secure them with timber pegs to stay put during slab pour. Square and rectangular slabs require that their formwork conform to shape by measuring diagonals between opposing corners – they must be equal. Cut control joints into your formwork at regular intervals in order to limit random concrete cracking – these grooves created by these cuts are known as shrinkage cracks and help the concrete distribute itself more evenly.


Finishing is designed to produce an even surface for maximum strength and beauty, helping prevent cracking. This step also serves to keep cracking at bay.

Before beginning construction of your slab on sloped ground, clear the site by using professional excavators and skid loaders to build up low sides and dig out high ones. Next, spread a solid layer of gravel fill over your soil, compacting it solidly using a plate compactor before sloping it in a trench around its perimeter for thicker edges.

As soon as the bleed water has subsided and your concrete is no longer wet, begin the smoothing process by using either magnesium or steel power floats to achieve a dense finish, taking care to avoid its edges. Use an edging tool specifically designed for this task to tidy any corners that remain, creating durable yet neat rounded edges along your form and other fixed structures.


Concrete slab foundations are highly reliable structures, yet still susceptible to damage. Repair costs could easily exceed six figures; therefore, proper maintenance protocols can prevent future issues that might incur high repair bills.

Site preparation is the initial step. This involves excavation, soil compaction, and form creation. Once this process has taken place, it’s time to lay the foundation.

Once concrete has been poured, it must be leveled and smoothed prior to setting. This can be a labor-intensive task which necessitates help from both partners in order to succeed.

Once your surface is leveled, use a bull float to eliminate ridges, followed by a concrete broom for nonslip surfaces that are easy on shoes. Regular power washing with concrete cleaner and deicer may also help ensure lasting beauty of your new foundation – or check out Ozinga for our selection of concrete care products which can keep it looking its best over time!

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