Laying A Screed Is Not An Easy Task
Usually people underestimate laying a screed but actually it is a complex task. Certain factors should be taken into account. The definition of a screed that every London flooring company will give you is a layer of screed material that is laid directly onto a base or onto an insulating or intermediate layer, which is done in order to provide a wearing surface, carry the final floor covering or obtain a defined level. In other words, this is a floor covering done to provide permanent, smooth and hard-wearing surface.
London flooring professionals share that the list of materials that screed comes in is long – cement, calcium sulphate and lime-based screeds. They can also come in different forms which include bonded, unbonded, heated and floating. After they are applied to a mature concrete base, they all can be modified. Flooring contractors in London say that by modifying you can improve the property of the screed, for instance reducing the shrinkage and improving the strength. In this way London flooring professionals reduce the minimum thickness applied for a particular application.
- Bonded screeds are usually mixed in a mechanical mixer and ratios of cement to water may vary, depending on the strength required.
- Unbonded or modified screeds are generally applied over a moist base proof membrane that is laid over a concrete base. Flooring contractors in London point out that the minimum thickness should be 50mm. Screeds have to be cured at the beginning as a quick drying may increase the risk of curling. Because of this fact, every respected London flooring company should make sure their workers cover the fresh screed with a sheet made of polythene during the first week before they allow it to dry in the air. This is done in order to avoid any risks of cracks and curling.
- Floating screeds are typically applied over an acoustic and thermal layer on top of an insulating base, for instance. Professionals in London flooring say that it is necessary to add a mesh made of steel to reduce the chance of cracking.
- Heated screeds have to be applied onto electric heating system over concrete with a layer of thermal insulation on top. To strengthen it London flooring experts use a steel mesh that is put above the heating system. In order to provide professional London flooring services, they also add fibers in the screed mix as by doing this they minimise risks of cracking and shrinkage.
- When flooring experts in London lay the screed they first must ensure that the mix is in the semi-dry consistency – when squeezed it should keep its shape but not crumble. After that the screed is applied with the use of a float or sometimes pumping machine to the chosen area. London flooring professionals use a screed bar to level the surface and to finish it they use screed and wooden floats.
- Because of the thickness and the conditions on site the drying times may vary. Flooring contractors in London recommend using boards to protect the screed from contamination and traffic.
- If you want to tile, London flooring company recommends a primer for the screed surface before you apply the tile adhesive. Priming is known to create an efficient barrier and makes the surface more secure.
- When you select the tile adhesive, flooring professionals in London say you should consider the tile type and the method you are willing to use for cleaning the floor. This is done in order to be aware of the risks related to the limited penetration of water. Depending on the tile environment, rapid or slow setting can be used.
In order to ensure a successful project, London flooring company recommends checking with manufacturer’s technical specialists.
Inspired by www.contractflooringjournal.co.uk