What types of polished concrete do you offer?
What is the difference between mechanically polished concrete (MPC) and a grind and seal (G&S)?
Mechanically polished concrete is for indoors only – it is the true form of polished concrete as it is the concrete itself that is polished and buffed until it shines – there is no topical coating to wear away over time therefore this floor will last you many years. Also, in floors that are mechanically polished like our Husqvarna Hiperfloors or our MPC, the concrete is hardened and densified to up to 10 times its natural strength so it is much less likely to crack. The concrete is also grouted which is a process that fills in the small pin holes and cracks on the surface, so the surface is smooth and very refined – if you run your fingers across the floor it looks and feels like glass. Then the floor undergoes a series of polishes using resins which make the floor smooth, shiny and glossy – you can finish the procedure after just a few polishes so that you end up with a matte finish – or you can continue to polish up to a very high grit for the semi or high gloss finish. The MPC is a very luxurious floor and is very highly recommended by the team at OzGrind.
A Grind and Seal however can be used for indoors or outdoors – and is a cheaper alternative to the authentic polished concrete and very popular in cafes and restaurants as well as outdoor areas, garages, driveways and homes. This procedure involves grinding the concrete to prepare it for a clear coating of a sealer like a polyurethane or epoxy. The clear coating will protect your concrete and if desired we can use a special grit in the top layer in order to make floors non-slip (ideal for around pools, and any wet areas). The final product still looks similar to the mechanically polished concrete, however it is the sealer that gives the floor an artificial shine – and so like any topical coating, over time this will start to wear and eventually need to be sanded back and re-applied. Sealers will generally last 2-7 years depending on traffic and they are available in a matte, semi-gloss or a high gloss finish.
Grind & Seal
What is the difference between mechanically polished concrete and honed concrete?
Honed concrete is the matching outdoor finish for the indoor Mechanically Polished Concrete (MPC), as the Honed finish is not quite as refined as the MPC. The Honed finish is grinded to a 60 or 120 grit; this is ideal as it makes it slip resistant. It has a penetrating sealer applied to protect the concrete – this can be done in an invisible sealer (no change to colour of the concrete) or a colour enhanced sealer (which will enhance/darken the concrete). Mechanically Polished Concrete on the other hand is a more complex process that involves densifying and hardening the concrete and then applying resins to polish it up until it shines. This process however can be stopped at a matte finish, or you can continue to polish up to a semi or high gloss. Please see example images below of the two finishes.
Can you stain the concrete if you want a different colour?
Can you colour match an existing slab if a new one is poured next to it?
Do I have a choice of coloured concrete and aggregate?
If you are lucky enough to be building a new house or extending, you will most likely be pouring a new slab from scratch. In this case you will be able to choose from the vast range of concrete mixes that are available in your area. OzGrind can polish Hanson, Boral, Holcim or other concrete mixes – the options available for Queensland are shown below. If you are renovating however and using the existing slab, you are more bound by whatever colour cement and aggregate is in your floor – the only real option if you want to change the colour is to use a concrete dye – however most customers are happy with the polished concrete look no matter what colour the cement and stones are.
What do you recommend for cleaning a polished concrete floor?
Will polished concrete fade or discolour over time?
Can you do this after hours?
How much dust can I expect?
How long before I can walk on polished concrete?
Is polished concrete slippery?
Can you have polished concrete outdoors?
Is polished concrete cold during winter?
Polished Concrete is recognised as being a sustainable and environmentally sensible building product, and this is largely due to its thermal mass properties (which is the ability of the floor to absorb heat and release it slowly). Therefore, in winter if a concrete slab gets warm during the day, it will release this heat slowly at night. Alternatively, in hot weather, if kept shaded after the coolness of the night it will retain that coolness throughout the day. It’s entirely your choice.
Will it feel cold to walk on with bare feet?
Surprisingly NO. Unlike tiles that have a small thermal mass, it can feel much warmer than tiles to touch in cold weather. Due to the size of the slab it is a good insulator and therefore if exposed to sunlight during the day, will absorb the heat and release it slowly at night.
What colour choices are available in Epoxy flooring?
Epoxy colours have almost as much colour choice as paint – there are many options available. Please see the below chart.
What can you do about oil stains on a garage floor?
If you want polished concrete on your garage floor we will grind the top coating off first, which will remove some staining. If the oil is still present we can do a procedure called a purge – and we can do this a number of times to bring the oil out of the floor. On most occasions the combination of grinding and purging will remove stains from your garage floor, however we cannot guarantee results. If staining is unable to be removed we would recommend using a solid colour epoxy coating similar to the below image.
Can you make our polished concrete floor non-slip?
What type of flooring would you recommend for an industrial setting?
If I’m building a new house and pouring a new slab, at what stage is it best to get the concrete polished?
OzGrind should be consulted from the very early stages of the build – we have some information that you can give to your concreter which advises them of the best way to pour the slab for getting the best polished concrete results.
As a general rule the concrete should be cured for 28 days before we actually arrive to do the polish. Then we can do the polish all at once, or in 2 stages. If we are to do the procedure all at once, we do the floors after the frame is up and internals are watertight. If we need to do it in 2 stages, it requires us to do an initial grind and grout prior to the frame being erected and a protective coating being placed over the floor until works have been completed or just before the plaster. We then remove the protective coating and can polish up the floor. It is much better for everyone if we come in after the frame is up, but before the skirting and plaster gets done.
Will you do work in rural and regional areas in Queensland?
Is polished concrete expensive?
Mechanically polished concrete has a minimal lifetime cost (see below comparison to other flooring options). There are too many options and variables to answer this question in this section. Polished concrete is not a mass-manufactured product that is simply installed, it is a process of grinding and polishing an individual concrete floor. Factors that will affect the end price include how open the floor plan is (so that the grinders and equipment can access all areas easily, otherwise hand work needs to be factored in), the condition of the floor, if it is a new or an existing slab, and how elaborate any decorative options might be, like how much stone exposure you want visible, and what gloss level you want. To get the best idea of how much polished concrete will cost on your floor, it is best to speak to one of the team at OzGrind.
If you would like to get an initial pricing estimate yourself, please feel free to use our Cost Calculator.
Can you choose the colour of the polished concrete?
If you want to polish the concrete of an existing slab then you are usually limited to whatever is already in the concrete. Your only real option if you don’t like the colour or the cement and aggregate is to put a colour dye over the top.
If you are pouring a new slab you can choose the colour of your cement and the colour of your stone (aggregate) from a number of concrete suppliers. Some examples of available mixes are below, and here is a virtual tour of our showroom showing real-life samples of available mixes that you can view in close detail. A small number of them are below.
It is important not to underestimate the colour of the cement as this can significantly change the look and the cost of the floor. Below are polished concrete samples using the same stone but changing the colour of the cement: