What is screeding?

I am often asked, “What’s the point of just screaming?” In short, screeding (at least as is common in the UK) is a thin, top layer of material, such as sand or cement, applied over structural concrete or insulation. The material is then smoothed and smoothed so that it has the same shape as the shapes or guides that surround it. Imagine a man measuring a cup of flour, then using a knife to smooth out the top. The dough is compacted and has a smooth top layer. This is screeding in its most basic form.

The most common use of screeding is in horticulture and landscaping. The contractor pours concrete into the form or guide and allows it to fill to a certain height. Screeding is necessary at this time to ensure that the concrete will be level as it dries. To do this correctly, a long piece of aluminum or wood, larger than the guides, is slowly moved over the guides. The tool is also moved back and forth while leveling and smoothing the concrete, ensuring a perfectly level floor. Industrial equipment is also available, ideal for use in large areas.

There are four main types of floor screeding designs:

  • Tied screed
  • Non-tied screed
  • Floating screed
  • Underfloor heating screed

Tied screed
It needs to be placed on the basis of shot blasted / scaled concrete, and fastened using an adhesive such as PVA, SBR, epoxy resin or good old-fashioned cement.

Unbonded screed
They are not directly attached to the concrete base, but are intentionally attached using DPM (moisture proof membrane).

Floating screed
Floating screed is used on hard insulation boards. It is recommended that the thickness of the floating screed should be between 65 and 90 mm.

Underfloor heating screed
A traditional sand and cement screed is a great choice of screed for heating the ground floor. Underfloor heating manufacturers and suppliers generally recommend a minimum screed depth of 60 mm for use with their systems.

The delivery, mixing and pumping of the screed is usually done by a single vehicle which is placed directly in the range of up to 60 meters from the mixing pan to the floor. For small applications, screed can be hand held.

Screeding can be left bare to achieve a modern urban style in the building and its surroundings, as is the case with the buildings of Japanese architect Tadaw Indo, known for the exemplary workmanship that evokes a sense of Japanese space. Alternatively other finishing materials can be applied on top.

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