FATQ’s

The following FATQ or Frequently Asked Technical Questions will help you to quickly answer any initial queries that you have. Please feel free to contact us on 01606 214201 if your query is not listed below, or you need further technical support.

  • I need advice on what screed I need?

There are such a large choice of screeds available we would need to know the following to provide the correct advice:

  1. What is the substrate (Is it concrete, or something else?)
  2. Do you know if the substrate is dry?
  3. Is there anything else that needs to be incorporated? (e.g insulation, underfloor heating)
  4. How thick do you need the screed to be?
  5. What will be the final floor finish?
  6. How quickly do you need to lay the floor finish?

*Note –This is the most fundamental question, so it may be easier to give us a quick call*

 

  • I am looking to speed up the drying time of a sand and cement screed – what would you recommend?

There are several options:

  1. In the market there are many proprietary admixtures that can be added to traditional screed to reduce drying times.
  2. There are “Special cements” also known as cement replacements that’s can be used instead of OPC, to improve drying times.
  3. Pre-blended bagged screeds, to which you just add water. Some of these have very fast drying times.
  4. There are some specialist screed materials that have extremely fast drying times, however these products can be costly.

*Note – some of the above options provide additional properties to the screed, for example strength.*

 

  • What is a free flowing screed?

A free flowing screed is a self levelling or self smoothing compound.

 

  • What is the minimum/maximum thickness on a types of screed?

 For typical traditional screed thickness information, please refer to BS8204. However, many propriety screeds can be laid thinner in accordance to the specific manufacturer of the screed being used.

 

  • How do I calculate how much of a product I need?

Coverage rates can vary for every product. We always recommend going off the coverage /consumption section of the technical data sheet. If you require assistance with calculating the amount using the coverage rate, please contact us on 01606 214201 and we will be happy to help.

 

  • Do all screeds need a carpet or final floor finish?

Traditionally, it has been the case that screeds have had to be overlaid with a floor finish to provide a wearing surface. However, we now offer products with abrasion resistant surfaces, which can be left uncovered. Often, although not always, these are designed as industrial finishes. More recently products have been created to be fashionable for decorative finishes.

 

  • Is it possible to get an insulated floor screed that will meet current building regulation standard?

The market changes daily and there are some specialist products that have entered the market, that do advertise as thermal screeds. At Screed Giant, we offer a large range of products suitable for use in insulation and screed systems. Please call for advice on your project.

 

  • When using Ardex A46 outside, what is the ideal temperature to use this at?

The temperature of the background must be 5 degrees c and rising until it hardens on external applications.

 

  • Can Ronafloor Coating be used in a home where live reptiles are living?

Epoxy resin floors, including RonaFloor epoxy coatings, are frequently used on floors for animal accommodation because they are easily cleaned, if they’re not scattered with slip resistant sand. They are also impervious to liquids and resistant to attack by chemicals in animal waste.  Kennels are a typical example.

Epoxy coatings typically can receive foot traffic after approx. 24 hours, and full chemical cure is approximately 7 days, and therefore exposure to cleaning products/water etc should be limited in this period.

 

  • Can Ronafloor HB100 be used on existing ceramic tiles?

Care should be taken when considering application of coatings to tiles.  Coating is not usually considered until tiles are in poor condition, when adhesion of the tiles may be suspect, or if tile grout may be loose, friable or incomplete.  Light mechanical abrasion is required to obtain good adhesion, especially when treating half or fully glazed tiles, as this may cause debonding of the tiles from their bed.  Coating should only take place if adhesion of the tiles is certain and the condition of the grout is good.

 

  • Do you have a finished floor screed that I can use with underfloor heating without a floor finish?

Within an underfloor heating specification, it would be recommended to use a screed suited to the system or admixture for the system. You can then use an abrasion resistant screed such as an industrial floor screed as the final finish.

 

  • I have been told that I need to level and tile a calcium sulphate screed what product would you recommend?

In practice, we believe it unwise to use a levelling compound or adhesive containing cement on a calcium sulphate system.  Adhesives and levelling compounds suitable for use on calcium sulphate are available on our website.

*Note -Please don’t hesitate to contact us to discuss calcium sulphate brands available.*

 

  • How soon can I turn on my underfloor heating after laying the floor covering?

Most types of underfloor heating systems can be introduced to heat after 7 days. Some proprietary screeds can allow this to be sooner, but in all cases the system should be brought up to working temperature gradually.

 

  • I am looking for a product that isn’t on your website, are you able to get hold of this?

We have a wide range of products available, and will always try our best to source products that we may not have on our website. Simply give us a call on 01606 214201 between the hours of 8.30am and 5.30pm.

 

  • What floor covering can I have on top of Under Floor Heating (UFH)?

You can have almost any finish on top of UFH, just as long as the floor recommendations from the manufacture are adhered to. Usually, it would be a requirement that the Underfloor heating should be commissioned and turned off again prior to the application of a finial floor finish.

 

  • What is the drying time of screed?

Drying times will vary depending on what type of screed you are using: whether it’s a cement replacement, additive or self smoothing compound. It is important to keep the building conditions in mind too. We would also recommend looking at the technical data sheet on the product for a rough guide on approximate drying time.

 

  • I’ve heard about shrinkage, cracking & curling in floor screeds, what are these and how do they occur?

These are common issues screeds may face. The screed drying process takes place from the surface down, this resulting in a tendency for the screed to curl upwards at the edges. It is also possible for the screed to undergo shrinkage within the drying period.

The extent of shrinkage cracking and curling of screeds are influenced by:

1)Drying conditions – It may be necessary to control this, and the drying time, by covering the screed with polythene – this is known as curing.

2) Mix proportions– Excessive amounts of cement or water in a screed mix can be harmful to the screed, and cause the screed to be more prone to curling and cracking.

3) Bond strength – The tendency of screeds to curl upwards at the edges during drying is generally resisted by the bonding to the substrate and the thickness of the screed. Bonded screeds have less risk of curling and cracking.

4)Thickness of the screed – Thicker screeds have more strength to resist the curling force.

 

 

 

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