Polished Concrete Floors

Sponsored by NSW based Grind & Shine and Queensland's myFloor.net.au

Polished concrete flooring

If we are talking ‘flavour of the year’ in architectural flooring, polished concrete would have to be ‘it’.  Not yet commonly used in the Australian housing market, concrete flooring is relatively easy to install and is hardwearing, easy to maintain, cost effective, very sleek and will last a lifetime. 

Concrete floor installation is categorised into two types: new floors, and retrofit floors.

New floors require less work resulting in lower costs, but there are a few things you need to be aware of so your new concrete floor can be polished. 

Firstly the slab needs to contain a decorative aggregate.  The two most common aggregates are river stone and black basalt mix, however the aggregate can be almost anything you like. 

 
River stone & black basalt aggregate colour samples

The finished surface of the concrete will need to be finished to a high standard to facilitate the polishing process. During the finishing phase any decorative aggregates such as seashells or car parts can be dropped into the surface of the concrete. 

 
Art under your feet: saw blade inlays

Note: the builder needs to be aware at the early stages of your job that you want polished concrete so that the final finish is of the best quality.

Retrofit floors can be done in two ways.  The existing floor slab can be cut (sanded) and the natural aggregate will be the feature (usually black basalt) or a toping slab with a minimum thickness of 50mm can be added on top of the existing slab. 

 
Standard concrete slab aggregate and new slab aggregate
© Grind & Shine Floor Polishing Systems

The first option is usually used as it will not reduce the finished heights of door openings and ceilings, however if a topping slab is used you have an option of aggregate finishes.

The process

1. The concrete floor is cut 3-4 times depending on the finished surface and the desired aggregate exposure.  This can be done wet or dry depend on the site situation, This process will remove 3-5mm of concrete thickness.  If it is a new slab the cutting should occur before any walls are erected to ensure the best finish (it is harder to work around walls).
2. The surface is then grouted with cement to allow imperfections and air bubbles to be filled.
3. Two more cuts are done after grouting.
4. A clear liquid hardener (indensifier) is then worked over the surface with a window squeegee.  The indensifier will provide a very glossy look to the finished floor and gives the floor extra strength.  The indensifier is worked into the slab for about 1 hour and will soak into the slab 5-10mm. This will require overnight curing before more cutting is applied.
5. The floor is then cut another three times – this is the final polishing stage.
6. Lastly the concrete surface should be sealed with a stain and block out sealer to reduce water and oil staining.  The sealer will also reduce mould build-up in wet areas.

 
© MyFloor Polished Concrete Floors

Concrete flooring will not chip or dent like softer surfaces such as timber and is easy to maintain.  Mopping with warm soapy water once a week is the only maintenance required.

Cost of polished concrete floors

Polished concrete floors are relatively inexpensive when compared to other high-end floor finishes.

Find a concrete floor polisher