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Can you use self levelling compound outside?

You can use self-levelling compound outside, if you choose the right product. Ardex K 301, Resin Coat CTR044, Setcrete Exterior Floor Levelling compound,  Pourable Concrete, Leveller by floorsaver are all suitable for this application. They are all specially formulated to be incredibly hardwearing and unaffected by rain or frost. They are also able to withstand vehicular traffic.

Note: You may be able to use regular internal self-levelling compounds outside in small areas, but you would definitely need to treat it with an epoxy resin-based paint or coating, in order to make it more hardwearing.

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.