What’s the difference between a 32mpa slab poured for Nil exposure, and a 32mpa slab poured for a Burnished appearance?
When a slab is poured for a burnished appearance, at the time it is being poured, the concreter goes over the slab repeatedly with a helicopter machine. These repeated actions are known as heavily burnishing the slab. The result is that this gives the surface of the slab a swirly pattern, which is sometimes also described as a cloudy pattern. Each time the machine goes over the slab, the wet concrete gets compressed more and more. Then, when it is polished, the burnished floor retains that swirly or ‘cloudy’ pattern.
In contrast, when a slab is poured for a ‘Nil exposure,’ the aggregate must be placed as low as possible, but the surface of the slab is not heavily helicoptered (i.e. the Nil floor is not heavily burnished). 
These two types of slab pour—Nil exposure and burnished floors—are the most difficult of all to achieve correctly, specifically for polishing. If you are interested in having a Nil exposure floor or a burnished floor, please ensure that you put us into contact with your builder very early in your planning process and definitely prior to having your slab quoted. Please keep in mind that it costs more for the concreter’s labour and time to achieve this slab, and it is also important for us to know if you are choosing one of these types of slab pour as early in your project as possible to help ensure the best results.
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- Email your building plans, or square metres, and what type of usage the floor have, or phone us.
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Real Stories
Thanks for our beautiful floors Tim!
We love them!!
Exactly what I pictured in my head..if not better!!
We first used Grind and Seal at our Braeside premises in May 2018 to prepare our concrete floor into a beautiful shiny area for some vintage cars. The area was approximately 230 square metres and the finish was even better than we had expected. Therefore when it came to expanding the area by another 123 square metres in 2019 we had no hesitation in heading straight back to Grind and Seal. Once again Jay weaved his magic ably assisted by Tom to produce another impeccable finish. We would have no hesitation in recommending Grind and Seal to any potential customer. Thank you to everyone at Grind and Seal.
The tradesman were very professional. Polite and respectful. My front porch looks fantastic and I keep admiring it. Never to be painted again.I would recommend them to anyone and the guys even painted between my wooden fence posts.Thank you Grind and Seal
Anyone who hasn't seen polished concrete before should definitely try it! It looks amazing and is so easy to clean - I totally love it. I got Grind And Seal to come and do my home and they were awesome - lovely guys and were really good at explaining stuff to me. Price was really reasonable and now all my friends are jealous of my floors! - Thanks Grind & Seal I will be recommending you to everyone although my floor really speaks for itself.
Good service, Happy to recommend Grind & Seal. Our floors look a million bucks and came up just so well. Was a difficult job but their experience really showed and they got around all hurdles. We were so impressed. And as our cheapest quote by far we were happy that we got such a good job. Nice team and made the whole process so very easy.
Grind and Seal did a terrific job at our property, we knew in advance of building our new home that we were going to have polished concrete downstairs, therefore we contacted Grind and Seal to speak to them about our job and they liaised with our builder/concretor to ensure that we had a concrete slab with the perfect specifications for what were after!When it came time to complete the work the guys were punctual, friendly and very professional. The place looks fantastic and they were only too happy to appease my wife's needs to inspect the job at every step ...
We got Grind & Seal to do the polished concrete in our home. They were incredibly professional and friendly to deal with during the process and the floor looks amazing – they were not the cheapest, but I think you get what you pay for – and we got top quality for a competitive price. Will definitely be recommending their services.
JAMES, facilities maintenance PROJECT MANAGER for 5 councils Honestly I've never felt as compelled to give positive feedback as I have with this company's services and I deal with hundreds of companies a year in the course of my work, it has been a refreshing experience.
Our idea to have a “garden party” theme for Christmas last year sounded great but our old mouldy concrete was an eyesore! Within 2 days the grind and seal team transformed our very drab rear and front yard into magnificent useable entertaining areas with minimal disruption to our lives. We have now decided on polished concrete for our extension to merge the indoor/outdoor living areas. The Grind and Seal Polished Concrete team worked hard to deliver a great result, they provided a quality product in a timely fashion, they are honest & reliable – a refreshing change in this day ...
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