Creative Tiling Qld Pty Ltd

When it comes to creating the perfect cement bed screed, one critical component that often gets overlooked is the type of sand used in the mix. Sand not only affects the strength and durability of the screed but also its workability and curing time. Therefore, choosing the right sand is paramount for a successful screeding project.

Why Sand Type Matters

Sand acts as the aggregate in the screed mix, providing bulk and helping to define the screed’s final properties, such as hardness, flexibility, and porosity. The right sand should have sharp, angular grains that lock together well, as opposed to smooth, rounded grains that can result in a weaker bond.

Regional Varieties: A Closer Look

One intriguing aspect of sand selection is the variety of names and types available in different regions. For example, in Brisbane, the commonly preferred sand for screeding is often referred to as “medium river sand.” This local variety is favored for its optimal grain size and texture, which are ideal for achieving a smooth, durable screed surface.

However, the terminology and preferences can vary significantly from one region to another. In other areas, you might find terms like “sharp sand,” “builders’ sand,” or “concrete sand” being used to describe the best local aggregate for screeding purposes. Each type has its own characteristics and suitability depending on the local environment and the specific demands of the construction project.

The Impact of Local Sand on Your Screed

The local environment can influence the sand’s properties due to factors like mineral content, grain size, and moisture levels. These variations can affect how the sand interacts with cement and water in the screed mix. For instance, sand from a coastal area may contain salts that can lead to corrosion or efflorescence, while sand from a riverbed might be too smooth for optimal bonding.

How to Choose the Right Sand

To ensure you select the best sand for your screed:

1. Research Local Varieties: Learn about the types of sand available in your area and their common applications in construction. Consult with local suppliers or construction professionals if in doubt.
2. Check Grain Size and Shape: Ideally, the sand should have sharp, angular grains that range from 0.1 to 2mm in diameter for the best results.
3. Consider the Screed Mix: Remember the intended ratio, whether it’s 1:3 or 1:4, and choose a sand type that complements the mix for the desired finish and strength.
4. Test for Impurities: Conduct a simple field test by mixing the sand with water in a clear bottle and letting it settle to check for excessive silt, clay, or organic matter, which can weaken the screed.
5. Consult with Experts: If available, seek advice from local construction experts or screed specialists who understand the regional materials and conditions.

By selecting the appropriate sand for your screed mix, you not only ensure the longevity and durability of your flooring but also help prevent potential issues such as cracking, flaking, or uneven surfaces. Remember, when it comes to cement screed, the smallest details can make the biggest difference.

Click here to see our cement bed screed guide.

Not sure how much sand to order for your screeding project? No worries click here to use our Screed Calculator.

If the floor is uneven or slopes too much and youre unsure, then you can use our uneven floor screed calculator, click here.