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Can you use out of date self-levelling compound?

Yes, Get it used up! The quality of the product inside will not be compromised.  The only thing that causes self-levelling compound to go bad is moisture getting into the bag.

There is a simple check you can do, Open the bag if it is still fine and powdery you are good to go. If there are hard clumps of it stuck together, then maybe best to bin it. These clumps may not mix in properly and be present in the final pour.

If self-levelling compound is left for long enough it will eventually form one solid block in the bag.

What is self levelling compound?

Self-levelling compound is also known as a floor screed or floor levelling mix. It is a thin layer of a cement-based mixture that is applied to subfloors in order to level out any bumps.

The mix is applied in a thin layer to subfloors such as concrete and floorboards, you use it before laying another floor, such as tile, above it.

It is called a self-levelling compound as it, in theory, self-levels. What this means is that you don’t have to worry about getting the mix perfectly level. It should flow across the floor, and correct any errors.

While this does generally work, there are limits. It doesn’t flow like water so will not perfectly level over a large area and may require a bit of help from you.

Why use self-levelling compound?

You use a self-levelling compound to turn a bumpy, un-even subfloor into a perfectly smooth surface. This is great when you are fitting a solid floor such as tile or wood.

Your floor wont be able to hide the bumps and just sit on them when you fit a rigid floor. Tiles will crack and break and a wood floor will bounce and move. Whereas a flooring like carpet will happily sit on an uneven base.

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