Site Preparation & Application Process

Site Preparation & Application Process


As part of our service, we are happy to conduct a site visit prior to each pour. At this time we will assess the access to the site, the water supply and finalised details of the site preparation, answering any questions you may have.

Given that Truflow Screed is a liquid when being installed, you will need to make a few simple preparations before our team arrives on site:

When installing over underfloor heating

  • Step 1     Installation of Datum Line
    We ask that a chalk line is marked 1 meter above the finished screed level. This will act as an indicator to our team, who will use laser levels during the pour.
  • Step 2     Install insulation
    Truflow Screed can be poured over up-to 200mm of insulation. Our recommendation is that a combination of polystyrene and high density insulation are used, with the high density being installed nearest to the top
  • Step 3     Install Expansion Strip
    It is best practice to install an expansion strip around the perimeter of ALL walls in the building, to ensure the walls and floors are kept separate. Dependent on the insulation used, it will also help with flanking sounds between rooms. There is no-need to install expansion joints in the floor unless there is a run of greater than 7m in any one area.
  • Step 4     Install Plastic Membrane
    Installation of a plastic membrane is essential when pouring a liquid screed. By its nature, the screed will flow anywhere it is let, therefore installation of a 1000 gauge plastic membrane over the chosen insulation is required to tank out the area. The plastic should be well taped, and turned up the walls approximately 150mm. It should be flush with the walls and corners.
  • Step 5     Install UFH pipes
    Underfloor heating pipes can be installed in a variey of methods, clipping down onto the insulation, by means of a track system or cable-tied to mesh are the most common. Our requirement is that the pipes are clipped/fixed every 300mm to ensure that they do not float in the screed. If the underfloor heating pipes are being installed into a system plate or egg-crate like system, please advise us.


When installing as a levelling screed

Preparation is necessary. Truflow Screed is a Calcium Sulfate based screed and when used as levelling screed over existing concrete or sand and cement it is essential to debond the two screed types.

  • If the average depth of the screed is over 25mm, a 1000 gauge plastic membrane is required to tank out the area.
  • Where pouring less than 25mm, a special primer will be required. Our team are happy to install this prior to installation of the screed.

Please contact us for further details of how preparations should be completed on-site.


Application Process

Truflow Screed is only using our specially trained staff.

Causing minimal disruption to your site, virtually every aspect of our application process is performed outside of the building. Delivered by truck on-site and then poured via our compact pump-mixer, Truflow Screed is fed into area being screeded by hose, through either a window, door or up the stairs.

The screed is rapidly installed in a single continuous operation. Following a light dappling of the surface the job is done. Within hours your job will be completed. Simple, quick, no fuss.

Within 24 hours, you will be able to walk on the screed and continue on with light works on-site. When applied properly this anhydrite screed will form no surface laitance and therefore no sanding or powerfloating will be required after the pour.

We recommend that details outlined on our Before and Aftercare sheet are followed.

The next day you will be able to walk on the screed and continue on with light works on-site.

We recommend that details outlined on our Before and Aftercare sheet are followed.

Questions! Call:

07710 468 654

020 8463 9880

Photo Gallery

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Truflow Screed Photo gallery

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