FAQ’s

Naked Concrete

Frequently Asked Questions

What is Mechanically Polished Concrete?

Mechanically Polished Concrete is the result of a process that involves progressive grinding, densifying and polishing of the surface until you have a smooth, glossy, durable and attractive floor.

Firstly the surface is ground down until the desired amount of aggregate has been exposed in the concrete mix, this is followed by the grouting process (if required) to fill the majority of pinholes and hairlines cracks that are visible, then begins the polishing which involves the use of a combination of densifiers (hardeners) and refining the surface with progressively finer grits until the desired gloss level if reached.  Finally, the floor is sealed with an impregnating (penetrating) sealer and buffed.

The final product is a low-maintenance, seamless, strong, abrasion-resistant, non-dusting and spill-resistant long-term flooring solution.

What is Honed Concrete?

Honed Concrete is most often used in external areas that require slip resistance.

The surface is first ground down until the desired amount of aggregate has been exposed in the concrete mix. This is then followed up by another pass of finer abrasives to remove the coarse scratch patterns, resulting in a 50-grit metal bond diamond finish.

Honed Concrete is generally not grouted and is sealed with an impregnating (penetrating) sealer that does not affect the surface profile or slip-resistance properties.

What are the different levels of aggregate exposure available?

Surface Polish (also known as Burnished) This is where zero (or very minimal) aggregates are visible. The concrete must be highly burnished (trowelled) by the concrete finisher during the pour. Once cured, we will then mechanically polish the surface to refine it and achieve the desired gloss level.

Minimal/Random Exposure (also known as Salt & Pepper) This is when the surface is ground to expose the fine and coarse aggregate particles randomly and inconsistently within the concrete mix. Approximate grind depth is 1mm to 3mm.

Full Exposure – This is when the surface is ground to fully expose the coarse aggregate particles consistently within the concrete mix. The approximate grind depth is 3mm to 5mm.

Can you polish old or existing concrete?

Yes we can, although it is impossible to guarantee an end result because we have had no control over the concrete supply, placement, colours or aggregates. Given these unknowns and variables, it would be difficult to get a level of finish usually achieved when working with concrete that has been designed, engineered and installed specifically for polished concrete.

In saying all of this, we have achieved many amazing finishes on old and existing concrete slabs but it is vital that the customer understands and accepts the previously mentioned factors.

For works to be undertaken in existing buildings; all furniture, internal doors, architraves, skirting boards and joinery kickboards must be removed (by others) so
we can have clear, unobstructed access to the entire work area.

Please note: all surfaces will need to be protected prior to, and possibly cleaned and made good, on completion of our works (for which we will not be held responsible). This is due to the heavy-duty nature of our work and we thank you in advance for your understanding.

Are polished concrete floors stain proof ?

No they are not, as there is no topical sealer on top. As with any natural stone floor polished concrete only has a penetrating sealer in the floor to help buy you some time as to clean up spills in a timely manner.

Will the concrete crack ?

Yes, concrete unfortunately will crack, but various things can be done to minimise cracking in concrete floors. We can advise on best practices with placement and curing practices to help minimise surface cracking

Is polished concrete expensive?

There are two aspects to consider when working out the costs for polished concrete:

a) Is this for an existing slab?
Getting this prepared and polished is relatively inexpensive if the surface is in good condition. You also have to factor in the cost of removing the current flooring, so removing carpet will be cheaper than removing floor tiling for example.

b) Is this in preparation for polishing a new slab being built?
When you are building a new site, the cost of the concrete to be polished will include whatever the size and specifications of the new concrete floor, plus the polishing service. There are a wide variety of colours and textures as well as design specifications available to choose from when you are starting with a new slab. The overall cost will depend on those
choices, size, thickness and difficulty of the site to get it poured.

What are the benefits of using polished concrete?

  • Great for people with allergies
  • Energy efficient
  • Easy to clean 
  • Low maintenance
  • No harmful VOC’s
  • Visually appealing
  • New floors can be customised to customers’ tastes including different stones and colour
  • Hard wearing