Achieving a level subfloor is essential before laying any new flooring, whether you’re installing luxury vinyl, timber planks, or sleek large-format tiles. If the surface isn’t flat, your new flooring may creak, bounce, or even crack over time.
When it comes to floor levelling services, there are two main approaches: self-levelling compound and manual levelling. Each method has its own strengths and is suited to different project types. In this article, we’ll explain how they work, compare their costs and results, and help you determine which approach is the right fit for your flooring project.
What Is Self-Levelling?
A self-levelling compound is a specialised cement-based mixture that flows and settles naturally to create a smooth, level surface with minimal manual intervention. The compound is made up of cement, fine aggregates, and advanced polymer additives. These polymers give the mix its fluid properties, allowing it to spread out across the room, fill low spots, and correct unevenness effortlessly.
It’s commonly used on concrete subfloors before laying tiles, vinyl, laminate, or timber flooring. Because it’s highly fluid, it finds the lowest points of the room and fills them automatically. Take note, though, that self-levelling compound is designed to create a level or flat surface rather than a deliberate fall.
In Australia, pricing for self-levelling compounds varies depending on the specific product used and the thickness required for the job.
What Is Manual Floor Levelling?
Manual levelling is the traditional method of applying a sand and cement screed or mortar mix to a subfloor. Using specialised screeding tools, straight edges, and trowels, the installer spreads the material across the room by hand.
Unlike fluid compounds, manual levelling allows for greater control over thickness and falls. This makes it highly suitable for areas that need significant height adjustment, or where structural loading is an important consideration. It’s also perfect for spaces like bathrooms where you need to create a deliberate slope toward a drain.
However, because the mixture is much thicker, it typically takes longer to apply and cure than self-levelling compound. Screeds can also be engineered to achieve a higher MPa (megapascal) strength where required.
Key Differences Between Self-Levelling and Manual Floor Levelling
While both approaches achieve the same goal of a level subfloor, they differ in the application method, costs, and finish quality. Here’s how they compare according to these three main factors.
Application and Speed
A self-levelling compound is poured directly onto the prepared substrate and spreads on its own, covering large areas quickly with minimal labour. It’s an excellent choice when time is a major factor. You can walk on the surface within hours, and it’s usually ready for flooring installation within 24 to 48 hours.
In contrast, manual levelling is labour-intensive. It requires skilled trowelling and generally takes longer to apply and cure. Screed drying time depends on thickness and the local weather conditions. This means that the surface can take several days or even weeks to dry completely before you can lay your final flooring over it.
Cost and Material Considerations
The financial side of the project comes down to a balance between materials and time. A self-levelling compound has a higher material cost per square metre, but it comes with lower labour costs because the application is so fast.
On the flip side, manual levelling uses more affordable materials, specifically sand and cement. However, it requires more labour hours and highly skilled tradespeople to get the job done right.
For larger commercial projects or heavy-duty applications where you need to fill deep depths, a manual screed can be more cost-effective overall. Self-levelling compound tends to be the better choice for smaller or time-sensitive projects where saving days on the timeline reduces overall costs.
Accuracy and Finish Quality
How smooth does your floor need to be? Self-levelling compound produces an exceptionally smooth, flat finish that is ideal for thin floor coverings such as vinyl or engineered timber, where even the tiniest bump will show through the surface.
Manual levelling can achieve a level result, but it’s highly dependent on the skill of the installer. It may also require additional sanding or grinding afterwards to reach that same mirror-like smoothness. However, manual screeding provides greater control over the overall floor profile, making it the preferred option where a specific fall or slope is required.
The required screed strength can also be specified according to the intended use of the space, loading requirements, and the type of floor covering being installed. For applications where a perfectly flat surface is critical for the final look, self-levelling compound is generally the preferred option.
When to Use Each Levelling Technique
Every project has its own unique challenges, so knowing when to deploy each technique will ensure your flooring looks fantastic and lasts for decades.
Self-levelling compound is typically best suited for:
- Projects with minor to moderate unevenness or small dips
- Tight renovation timelines where you need to lay floors within days
- Thin floor coverings like luxury vinyl tiles, where a smooth finish is essential
Meanwhile, manual levelling is ideal for:
- Projects requiring significant height buildup to match existing floor levels
- Heavy-duty commercial applications that handle substantial weight
- Creating precise slopes and falls, such as in wet rooms or shower bases
- Applications where a specific screed strength or higher MPa rating is required
Did you know that you do not always have to choose just one? In many projects, such as in laminate flooring installation, both methods can be used together to get the best result. Contractors often use a manual sand and cement screed to build up the bulk of the height, followed by a thin layer of self-levelling compound to achieve a flawlessly smooth final surface.
Both methods can also be used as part of a flooring system over hydronic heating, depending on the specific heating system, product specifications, and installation requirements.
Which Floor Levelling Approach Suits Your Project?
Deciding between self-levelling compound and manual levelling comes down to looking at your project’s specific requirements. By weighing up your budget, your timeline, the type of flooring you want to install, and the current degree of unevenness in your subfloor, the right choice becomes clear.
If you need a smooth, flat surface, self-levelling compound may be the right choice. If you need to build up levels, achieve a specific strength, or create a controlled fall towards a drain, a properly specified screed is generally more appropriate. In some cases, combining both methods provides the best result.
Safe Surface Preparation is a trusted Melbourne team with extensive expertise in both levelling methods. The team can assess your subfloor thoroughly and recommend the most effective solution for any residential or commercial project. Contact us today for a professional subfloor assessment in Melbourne and ensure your flooring installation starts with the perfect foundation.
