Traditional flooring screed is a mix of sand and cement. The standard mix ratio is four parts sand to one part cement, although, in some situations, the mix could be three to five parts sand to one part cement.
Traditional
Screed
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Data Sheets
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There are Three Core Systems for Traditional Floor Screeding:
#1: Fully Bonded Screed
The screed connects to the substrate (concrete subfloor) using an adhesive. Fully bonded screed needs a clean, rough surface and requires a bonding agent. Bonded screed suits thinner applications (15mm to 50mm) with expected heavy loading. The optimum thickness for bonded screed is 25mm to 40mm.
#2: Unbonded Screed
Unbonded screed is ideal for applications where dampness is a significant issue. The screed lays on a damp proof/PVC membrane to separate it from the concrete substrate. Unbonded screed is ideal for thicknesses that exceed 50mm. It’s best to allow for slow drying to prevent warped edges, which can happen if the screed dries too fast.
#3: Floating Screed
Floating screeds are typically added to a thermal or acoustic layer. With this screed, adding a membrane above or below the insulation layer is best. The recommended minimum thickness for floating screes for heavy loading applications is 65mm – 75mm.
Drying times for traditional screed vary depending on depth, weather conditions, and the mixtures used by the manufacturers.
If you’re unsure what type of traditional screed is best for your building project, contact the Flowmix team. We are happy to help guide you.
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Ordering concrete can be a minefield, as this is something that we don’t usually do and a one-off process. Called Flomix to explain what I was doing and what I wanted, and they was very very happy to help me choose the right type of concrete for my job. The driver arrived on time and was more than helpful team. Effort in most workplaces is essential, and this driver definitely delivered. Thank you for doing such a great delivery.
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