Self Levelling Compound on Upper Floors
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Can you use Self-Levelling Compound on Upper Floors?

If you are working on an upper floor, then you should use a “flexible” self-levelling compound. There is often more potential for movement on upper floors. Unless you are working in a high-rise flat or building that will have solid concrete upper floors.

There will always be a certain amount of movement in conventional suspended timber floors. You will definitely need to use a self-levelling compound that can withstand this movement in the subfloor. If you use an inflexible cement/water self-levelling compound on an upper floor it will crack and flake off.

You should instead use a flexible self-levelling compound similar to the one below, that comes with a tub of latex. The latex enables the self-levelling compound to remain ever so slightly flexible even after it has cured.

Easy to Spread
Ultra Level 2 -Part Self Levelling Compound with Latex
£19.00


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02/05/2025 10:39 pm GMT

Any floor loose floorboards should be securely screwed down to the floor joists. If there are large gaps and steps between individual floorboards then it may be best to overboard your timber floorboards with 6mm Plywood before applying your self-levelling compound. We have prepared a short guide on “How to over Ply a timber floor”.

How to calculate how much self-levelling compound you will need

Ultra Self levelling compound comes in a standard 20kg bag and will cover 2.5m2 at a thickness of 5mm. All you need to do is calculate the Area of your room and the thickness required.

Area of Room (m2) = Length (m) x Width (m)

Bags required = Area of Room (m2) / coverage 2.5m2 @ (5mm thick)

4m x4m =24m2 24m2/2.5m2 = 9.6 bags

For a room 4m x 4m you will need 9.6, so 10 bags

It is always best to have a couple more bags than you actually need just in case you end up pouring your self-levelling compound thicker than expected. There is nothing worse than running out mid-pour and having a ridge in your floor.

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