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As part of a construction, we inevitably talk about concrete slab and concrete screed. These are two very different processes that we often tend to confuse. You must know that the screed covers the concrete slab...

Pour a concrete screed

Pour a concrete screed

What is concrete screed?

Pouring a concrete screed is part ofan important step construction. This is the mortar-based surface layer that covers the concrete slab (indoors and outdoors) and has a thickness of about 3 centimeters. It is an impervious and stable layer which composes terrace of garden, soil of house, garage... In all the cases, the screed must ensure a perfect horizontality and a flat surface because its role is to receive the future floor covering.

To distinguish screed and slab, we must remember one thing: the slab first, the screed above, then the coating.

Two main types of screed

Above all, it must be emphasized that the screed consists of mortar itself composed of sand, water and binder (we can also find adjuvants in its composition). There are two ways to make and pour a concrete screed:

  • The traditional screed

It is usually manufactured locally, using a concrete mixer or a specific machine. The mortar is then applied by hand with a trowel or trowel followed by stretching with a mason's ruler for horizontal smoothing. It is a difficult technique and long enough to put in place.

  • Fluid (or liquid) self-leveling screed

As its name indicates, the mortar which constitutes it is thus liquid. The manufacture of this type of screed is taken care of by a specialist who makes a delivery by truck-router. Unlike traditional screeds, implementation is both quick and easy. The results are guaranteed, provided you recruit an approved masonry company.

How to pour a concrete screed?

We can distinguish 4 main phases:

1- first prepare a stable seat by compacting a bed of gravel

2- then install the formwork, that is to say the cladding which delimits the concrete pouring area

3- then prepare the mortar in a concrete mixer, be careful not to put too much water for the concrete to be solid

4 - Pour the concrete and smooth with a suitable trowel or trowel by placing a ruler on the formwork to have a level mark.

These are the 4 key steps but that's not all! As a good professional, it is also necessary to draw split joints every 2 meters to prevent the concrete from cracking, "pull the concrete" with a broom, let dry and finally chew the screed.

Pouring a concrete screed can not be improvised and even with knowledge of masonry, this technique requires a real know-how. It is better to use a professional mason who has the skills and equipment necessary to carry out this type of operation.


Video Instruction: How to Screed Concrete