Concrete placement and finishing best practices for polished concrete flooring

Concrete floor polishing

7 Jun 2018

Concrete placement and finishing best practices for polished concrete flooring

Getting a perfect polish, starts before you actually arrive on site. Concrete finishing and placement can play a big role in a lot of defects in the final polish. These defects or imperfections are usually brought back on the polisher as something they haven’t done right.

Understanding finishing and placement can help you to educate your concreters on how you want the slab placed or finished in order to give your client the perfect floor.

Make your floor be the picture that everyone is envious of.

These days there are 3 different types of methods that 99% of concretors will use to finish every slab.

  • Traditional screed
  • Power trowel
  • Laser screeding

2 common types of reinforcement used in most concrete slabs

  1. Rebar is the most common type of Reinforced used
    Rebar for concrete floor slabs
  2. Wire mesh is commonly used for non-structural slabs.
     Wire mesh for concrete non structural slabs

Tradditional screeding - Lowest level

Traditional concrete screeding for polished concrete floors

This has widely been regarded as the most common method in concrete finishing yet the least effective. Typically a screed bar is used or a piece of wood, meaning floor flatness is not as accurate as other methods.

As you can see in the picture there are screed marks visible in this floor which cannot be removed and is due to the concreter resting his screed which pushes down the aggregate underneath.

Vibratory screeding - Middle level

Vibratory concrete screeding for polished concrete slabs

Vibratory screeding uses power to better level the concrete surface.

  • Reduced muscle power required, a finisher can work standing up and the vibration of the motor on the screed helps to smooth the concrete.
  • Often used on smaller residential or commercial projects. Larger projects often will make use of the larger equipment to get in where space permits.
  • Screed bars are easy to attach, remove, and replace, and they come in different sized lengths. The longer the screed often the more awkward and heavy it is to work.

Laser screeding - Highest Accuracy

Laser screed for concrete pouring polished concrete floors - Best practice

  • Laser Screeds set the standard for large concrete pours and ensure your concrete is finished flat.
  • Most precise levelling method
  • Commonly used for polished concrete floor projects
  • Mechanically powerful and faster than alternative methods
  • Laser screeds ensure a faster installation time of the concrete

Concrete finishing - Best practices

There are several types of attachments used under screed machines. Where a concrete floor is being poured to polish we have identified the best attachment to be the PAN to get the best and flattest possible finish.

PAN’s help to ensure 15-20% flatter finish than Screed finish.

Float pans move material and flatten the floor more because of the weight but they do not tighten the slab.

Floating pan for ride on concrete trowelPan for concrete ride on finishing trowel

Power trowel blades, best practice

Power trowel blades for ride on trowelWhen finishing with a PAN blade to move a lot of concrete, filling in the lows and taking off high sections – we recommend your concretor uses either Plastic or Teflon blades to finish off.

Finish Blades help to ensure the hardest possible finish. These blades help to get the concrete to it’s hardest point before being blackened or burnt.

Common issues with concretors, edging and polished concrete

Issues with edging on concrete floors for polished concrete training

  • If the edges of the floor are not finished properly, they become more challenging to polish and make consistent with the rest of the floor
  • Hand trowelling does not work well for polishing, as the colour and texture difference will show
  • Our recommendation is to use a Power Trowel over the edges across a form, or adjacent slab, to give a tight finish to the edges a power trowel used in an anti-clock wise direction will compact the slab more than a hand trowel will. It will eliminate problems that occur, as seen in the picture. Because this was done with a hand trowel you can see the floor is not as tight and will polish up differently.
  • By making the finishing and placement right you will eliminate a lot of problems in the higher polishing steps
  • A l ittle care and patience during the floor pour will help make easy polishing!

Typical concrete finished on most slabs these days
Broom finished concrete floor slabExposed aggreage concrete floor - hard to polishHeavy steel trowelled concrete floor slabLoose concrete rain damaged floor slabShot steel blasted concrete floor slabStencilled concrete driveway floor grinding off to respray

We love talking polished concrete. Let's talk

To find out more with polished concrete floors and best practices or recommendations for placement and finishing talk with one of our team today – All Preparation Equipment, 1800 422 992. 

Wanting hands on, professional expert training?

Pyrafloor Polished Concrete Training Academy hosts a 2 day Comprehensive Polished Concrete Training course in Brisbane and Sydney.
In these 2 day training we cover a large amount on placement and finishing, along with grouting, repair, densifying, resin bond pad polishing, applying sealers, and many other aspects needed for Polishing Concrete Floors.

To find out more about the 2 day Polished Concrete Training course, Contact one of the All Preparation Equipment or Pyrafloor Polished Concrete Training team today.

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Keep posted with up to date training days and free training days working alongside with expert applicators and contractors from the States. All Preparation Equipment works closely with C2 Crete Colors International and Prosoco from The States, to ensure the latest, most innovative, and effective chemicals are used to create impressive polished concrete floors.

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Grout, Joint Fix, Crack Fix and Repair products.

Densifiers – Lithium and Potassium based for better results.

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Tints, Colours and Dyes.

Maintenance and Cleaning Chemicals for Polished Concrete Floors.