Technical Info – FAQ’s

Our Colour Cement Products include a variety of DIY Applications and Installations, such as Self Levelling Crete Floors, Colour FloorCrete, GranoCem Screed Floors, WallCrete, Stone Chip Floors, Industrial Flooring Systems and appropriate Bonding Liquids, such as CemPrimer or and Coatings/Sealants. Have a look at our different applications and you will be sure to find something that suits your style.

What is the secret to Colour Cement Flooring?

  • The Substrate should be a sound, hard, clean, well-cured concrete slab or cement screed, at least 3 weeks old, struck-off to level and wood floated.
  • The Substrate must be free from paint, dirt, dust, oil, glue, tar, old loose cement or any other contamination that could prevent the proper bonding of National Crete Products to the Substrate.

How to ensure a good topping (screed)?

To establish the quantity of sand and cement you would require for a topping of 30mm thick, apply the following equations:-

      • A. m² of floor x 0,04 = cubic meters of sand required.
      • B. 1(one) Cubic meter sand = 18 wheelbarrows of sand (filled level)
      • C. Therefore 18÷2 = 9 bags cement required per cubic meter of sand
      • One(1) wheelbarrow = 2 pockets of cement.

Mixing the topping (cement screed)

  • On a clean dry slab, thoroughly mix 2 wheelbarrows filled level with coarse Malmesbury sand (or similar in your area) to 1 pocket of 42.5N cement (4:1 mix), until a uniform colour is produced.
  • To produce a granolithic topping (cement screed):-

3 Sand: 1 Crusher Dust(6mm Stone): 1 Cement (4:1 mix by volume, not weight). That is:-1½ Wheelbarrow Sand: ½ Wheelbarrow Crusher dust(6mm Stone): 1 pocket cement.

  • Make as many of these dry mixes as would be required to complete floor or area to be covered.
  • Add water by fine spraying it on with a hose pipe whilst mixing, until the required stiff consistency is produced.
  • A good test will be to take some screed (topping) in one hand, close the hand with some pressure, open your hand and all the screed (topping) should be intact, but not soggy or wet nor sticking to your hand.
  • If the screed (topping) is too wet, bubbles will form when finishing a GranoCem Screed Floor, which will make the finishing process very difficult and tedious.
  • If the screed (topping) is too dry, bonding of the GranoCem Screed Powder to the topping is reduced, which could result in the delamination of the GranoCem Screed from the topping, causing hollow spot areas and also the screed (topping) will be of an inferior quality due to the lack of water, which will prevent the chemical process of binding and hardening taking place.

What is the substrate?

How to prepare a substrate?

For the application of either Colour FloorCrete or a Self-Levelling Crete Floor, ideally the Substrate (existing floor) should be a sound, hard, clean, well-cured concrete slab, power floated to a smooth finish or a 30mm cement screed (topping), at least 3 weeks old, struck-off to level and wood floated.

If the above requirements, condition, and quality of the Substrate are not met, a complete Self-Levelling Floor Repair to the Substrate is required.

Substrates could be of a substandard requirement, condition, and quality for various reasons, amongst others, being the lifting of tiles, grinding or removal of paint, glue, tar, etc.

A Self-Levelling Floor Repair is the easiest and most popular Floor Repair, this is done simply to have a level floor for tiling, carpeting or laminate flooring.

A Self-Levelling Floor Repair Kit can be used to do a repair between 3 and 6mm thick and even thicker depending on the amount of crusher dust(fine stones) added to level the floor.

A FloorCrete Floor Repair Kit can also be used to do a floor repair for the greater thicknesses of ±5mm up to 20mm. This can be done by creating a Granolithic Concrete, by adding crusher dust or fine
chip stone.

How fast can you do it?

Depending on the application you choose, a full installation can take from 7 days i.e. for a Self-Levelling Crete Floor, or a Colour FloorCrete, and between 14-21 days for a GranoCem Screed Floor.

A Self-Levelling Floor Repair Kit can be used to do a repair between 3 and 6mm thick.

A FloorCrete Floor Repair Kit can also be used to do a floor repair for the greater thicknesses of ±5mm up to 20mm. This can be done by creating a Granolithic Concrete, by adding crusher dust or fine chip stone.

How to order DIY Material?

Due to the different manufacturing & application processes, dates, batches and combination of all the various inconsistent natural raw materials used to produce National Crete Colour Cement Products, we cannot guarantee or take responsibility for any natural colour, natural mottle or textured differences, especially when a colour is selected from the National Crete’s sample boards and applied to different Substrates of various qualities and hues. It is best to order your preferred application within one manufactured batch. All our materials are made to order to avoid expired shelf life.

How to request an installation?

Once you have decided on your specific application, kindly complete the “GET A QUOTE” Form and we shall furnish you with a quotation for an Installation. National Crete Manufacturers make use of Qualified Independent Installers in certain areas. We shall secure an appointment to come and view your current Substrate (existing floor/wall) with a thorough consultation to ensure you know exactly what to expect. National Crete Manufacturers do not service more than one Client a day, so you can be assured of the utmost time and perfectionism which is sadly unknown by our competitors in this industry.

National Crete Contact Centre 086 1111 261