menu
Cerrar

Screed mortar for low thickness stamped screeds

Overlay is a screed mortar with high mechanical performance. Designed both for creating from scratch and for reforming stamped paving of low thickness, between 5 and 20 millimetres.

Its superior resistance to both compression and adherence allows it to be used both indoors and outdoors.

A screed mortar for floors that allows the work to be carried out even if it is difficult to access. Often concrete mixers do not fit and an additional pump is required, with the extra cost that this entails. With our overlay, the work can be carried out on site, without being subordinated to factors such as a site that is difficult to access.

Why our screed mortar

The applicator sets the pace of the work. He decides how many square metres it will be possible to carry out per day.

While many screed mortars have to be mixed with polymers to increase their resistance, Topciment® Overlay already integrates it in its formulation.

It is compatible with all our stamped moulds without exception; so the drawings that can be achieved are infinite.

It is suitable for exterior and interior use.

It is a screed mortar that allows a better workability.

It is stable to ultraviolet radiation, so it does not yellow.

Logo Overlay

High performance screed mortar Overlay

The high performance of our Overlay goes beyond what has been described so far. In addition to floors, it can also be applied on stairs. The perfect complement to create new walkable surfaces as well as to rehabilitate and consolidate those in poor condition.

A screed mortar for stamped floors that can also be used to create polished concrete finishes. It is also unalterable in freeze-thaw cycles, so it can be used in countries with very low winter temperatures.

Download the Overlay mortar technical data sheet here

Technical characteristics of the screed mortar Overlay

icono ph

pH

13 ± 1

Densidad aparente

Mechanical strength

Compressive strength: ≥ 60 N / mm2

Bending: ≥ 12 N / mm2

icon

Hardened density

1'95 ± 0'20 Kg/dm3

icono abrasion_taber

Abrasion resistance

≤ 9 cm3/50cm2

Consumption

For a pavement with a thickness between 5 and 20 mm, the consumption of the Overlay mortar is 2 Kg/m2 /mm.

Packaging

Overlay mortar is available in 25 Kg bags.

Colours of the screed mortar Overlay

Our Overlay screed mortar is available in 24 colours. A wide range in which grey and earthy colours are the protagonists. The same shades offered by another of our decorative mortars for renovating and creating stamped concrete floors: Stonecem® Floor.

A catalogue of colours that comes from high performance pigments that we manufacture in our facilities. Pigments that are totally stable outdoors and that do not fade or lose intensity as they are resistant to rain and sun exposure. Depending on the Sealcem® varnish used, the final finish will be one or the other. On the left, Sealcem® WT finish, on the right, Sealcem® DSV finish.

Color Noir
Color Noir DSV

Noir

color  Antracita
color Antracita

Antracita

Color Pizarra
color  Pizarra

Pizarra

Color cemento WT
color  Cemento DSV

Cemento

color  Ardois WT
color  Ardois

Ardois

Color  Acier WT
color  Acier DSV

Acier

color Zinc WT
Color Zinc

Zinc

color  Pewter
color  Pewter DSV

Pewter

Color Nogal WT
color  Nogal DSV

Nogal

Color Tabac
color Tabac DSV

Tabac

color  Verde Oceano
color Oliva DSV

Oliva

color  Tostado WT
Color Tostado DSV

Tostado

Color Jaune WT
color  Jaune DSV

Jaune

Color Crema WT
Color Crema DSV

Crema

color Pierre WT
Color  Pierre DSV

Pierre

color   Ton Pierre
color  Ton Pierre

Ton Pierre

color Blanco WT
Color  Blanco DSV

Blanco

color Mafil
color  Mafil DSV

Marfil

Color  Tierra WT
Color  Tierra DSV

Tierra

color  Mares WT
Color  Mares DSV

Mares

Color  Rubi WT
Color Rubi

Rubí

Color Mapplewood_WT
color  Mapplewood

Mapplewood

Color  Mocachino WT
Color  Mocachino DSV

Mocachino

color  Arenisca
Color Arenisca

Arenisca

microcementos
microcementos

Frequently asked questions about screed mortar

Screed mortar is a coloured mortar that is applied to make stamped paving when the minimum thickness of 10 cm required for stamped concrete cannot or does not want to be respected. In other words, it is a product that can reproduce exactly the same aesthetic finish as a standard stamped concrete floor, but with a significantly reduced thickness.

As a general rule, the thickness of the screed mortars that we usually find on the market ranges from a minimum of 1.5 centimetres to a maximum of 3 centimetres. With Topciment® Overlay, this range is reduced even further, allowing for stamped concrete pavements from 5 to 20 mm thick.

As mentioned above, a screed is used when a stamped concrete floor of less than 10 centimetres is to be made. Either because of taste and aesthetic preferences or because there is not enough height to apply a thicker stamped mortar.

It is important to underline that a screed mortar can be used both to renovate and rehabilitate an existing floor, as well as to build a new one. In the case of an old concrete substrate, if for whatever reason the screed cannot be applied, the soil must be compacted and raised to the desired height so that the product can then be applied.

In addition, Topciment® Overlay is equally suitable for indoor and outdoor use and resists freeze-thaw cycles to perfection.

The system for making traditional stamped concrete, i.e. with a stamped mortar or screed, does not differ much from the process of applying a screed.

It is essential to clean and prime the substrate properly.

Make expansion joints and the relevant cuts.

Apply the appropriate bonding bridge to the substrate.

Use a good release agent, stamp the flooring with the chosen mould and seal it with a high-performance varnish.

Important: a fibreglass mesh must be placed on the floor. Mix the screed mortar with a mixer or concrete mixer and mix it with water and polymer, if it is not included in the product. Topciment® Overlay already incorporates the polymer, so it is only necessary to add water to the mixture.

Depending on the formulation of the screed mortar and the manufacturer's instructions, the mixtures will be different. As a general rule, the recommended proportion of water can be between 12% and 20% of the mortar. In the summer season, in cities and countries where it is very hot, the amount of water required may be higher. In Topciment® Overlay the ratio is 5L of water to 25kg of mortar.

The following are the most common problems that can and do occur when applying a screed. Mistakes to avoid at all costs to avoid major mishaps over time.

1. Forgetting about expansion joints

It may seem obvious, but in more projects than you might think, something as basic as making the expansion joints is not done with the accuracy that a printed flooring requires. A mistake that is more common than we would like and which causes the printed concrete to end up cracking due to unwanted cracks caused by the pressures caused by temperature changes and/or seismic movements. Especially on surfaces that are heavily trafficked by heavy vehicles.

2. No perimeter joints

Perimeter joints represent the separation of the surfacing from structural elements of the pavement. Their main function is to ensure that the mobility of the surfacing is not compromised. Therefore, the perimeter joints must be placed in all the joints of the stamped concrete floor that is going to be made with the screed mortar. If this is not done, cracks will appear sooner or later in the screed.

3. Not respecting the mixing ratio of the screed mortar

The importance of strictly following the manufacturer's instructions on the mixing and mixing of the screed mortar has already been detailed above. If this is not the case, not only will the consistency of the product be altered, but also the drying times and, more importantly and seriously, the mechanical resistance will decrease. The lower the performance, the lower the quality and guarantee of the product.

4. Not taking into account the unevenness of the pavement

Special attention must be paid to the unevenness of the surface so that it does not exceed 15%. If this figure is exceeded, we will find more than palpable differences in the thickness of the slopes of the stamped concrete floor. An unevenness that would crack the paving.

Like any product, the cost of screed does not depend on a single element, but is subject to several factors that determine its value. The quality of the screed mortar, the labour and dimensions of the flooring to be renovated, as well as the thickness of the product itself are just some of them.

Not only can it be done, but it is also an excellent solution. Screed mortar promotes optimal heat transfer from the underfloor heating to the room or area in which it is located. But not only that, it also minimises possible heat loss to the layers below. An advantage to which we must add the lower energy costs and, therefore, the economic savings over time.

The only thing is that a protocol for switching on the underfloor heating must be followed to avoid shrinkage cracks. Therefore, the screed mortar must be applied with precision on an underfloor heating system and the temperature must be gradually increased.