screed floor

Concrete and screed floor are widely used in construction projects. However, the non-professionals may be confused about the difference between these two mixtures since they are both mixtures of cement and aggregate.

In this article, you will know in detail what screed is and how it differs from concrete. And we’ll also show you the types of screed and how to screed floor.

What Is Screed

Screed is a mixture of cement and sharp sand, usually in a ratio of 1:3 or 1:4.5. It is laid on a solid poured concrete slab. It has the function of sound insulation, heat insulation, covering heating systems, and obtaining a flat surface layer.

The screed floor surface can be covered with decorative finishes or can be used directly as finishes.

Difference Between Screed And Concrete

Ingredients

Screed is a mixture of cement, sand and water. It has no coarse aggregate, can not form a strong skeleton, difficult to withstand strong loads.

Concrete is a general term for construction composite materials made of cementite materials to cement aggregate into a whole. Ordinary concrete is an artificial stone made of cement, coarse aggregate, fine aggregate, admixture and water mixed and then hardened. Concrete has the characteristics of workability, high strength, deformability and durability.

concrete and screed

Strength After Hardening

Screed is a finish mixture that contains much less aggregate than the mixture used for concrete, so it does not have a high strength.

Factors affecting the screed strength are as follows: When the quality of raw materials is fixed, the strength of mortar mainly depends on the cement label and the amount of cement. In addition, screed strength is also related to sand, admixture, mixed materials and masonry and curing conditions. When the content of mud and other impurities in the sand is large, the screed strength is also affected.

Concrete can achieve very high strength and can be used in a variety of high-strength structures in addition to floor slabs. Concrete strength includes compressive, tensile, shear, flexural, flexural and binding strength. The compressive strength is the largest and the tensile strength is the least.

Applications In Flooring

Concrete floors are reliable and durable, low maintenance and rich in variety. Different additives and dyes can be used to build concrete floors with different functions. For example, dry shake hardener can be added to make a wear-resistant concrete floor.

Screed is usually used on top of a rough concrete slab. It gives the floor a leveler surface before covering carpet, tile, wood floors. And the bottom of the screed floor is covered with a sound insulation polymer and a floor heating system, the floor can obtain corresponding functions.

Concrete floor is formed at one time during construction, its construction difficulty and professional higher. It is mostly used in some commercial buildings.

The screed floor has better flexibility and is relatively less difficult to construct. And according to the needs, you can find some special screed and kits on the market to achieve the required strength and curing speed. So it is widely used in residential buildings and renovation of old floors.

Types

Types Of Concrete Floor

Ordinary indoor concrete floors include: Polished concrete, stained concrete, terrazzo concrete, epoxy concrete and wear-resistant concrete. There are also various outdoor flooring applications, such as permeable concrete, which we will not mention here.

Polished Concrete floor

Types Of Screed Floor

Leveling screed – Use the screed to level the ground so that the level of the next layer is obtained.

Bonded – The screed is laid on the base to improve the strength of the ground.
Unbonded – Use a functional film to separate the screed from the base. The unbonded screed can be placed on top of the moisture-proof film and spread to a thickness of more than 50mm to reduce the risk of settling and shrinkage.
Floating – The compound film is laid below the screed to separate the base and screed, which can realize the function of sound insulation, heat insulation and moisture resistance. It is often used in laying the floor heating, with a thickness of 65-75mm, and it is also a type of adhesive mortar.

there are 4 typs of screed

How To Screed Floor

Floor screeding is the flattening of concrete or mortar to a smooth and level surface.

For large area floors, you need to set up formwork and use professional machines such as laser screed or roller screed to complete the leveling work. Large areas of floor screeding construction, we will cover in a future article.

For small area floors (house floors), you can use concrete or screed for manual leveling.

floor screeding construction

Make Level Marks On The Floor

Usually, it would help if you used a laser leveler to mark the height to be leveled, draw a marker line on the wall and make some level markers on the foundation.

Preliminary Paving

Place the concrete or screed evenly on the floor according to the level marks.

Screeding The Floor

Prepare an aluminum alloy hand screed (length is more than 1.2m) and use it to scrape the concrete or screed at the level marked until the surface is flat and level. If the floor is laid with PVC heating pipes, attention should be paid to pipe protection.

In the process of screeding, we must keep the level of hand screed. You can observe the level of hand screed to maintain the level, but experienced construction personnel with experience can screed level.

Float Floor Surface

Use a hand trowel to float the floor.

Video

The detailed method can be found in the following video:

Conclusion

In this article, we have explained the difference between concrete and screedfloor in detail, as well as their types. screed like a concrete complement, fixing flaws in the floor and adding features. Finally, we explain the construction of floor screeding. And we insert a detailed video introduction for floor screeding teach. With this article, you must have an in-depth understanding of concrete and screed floor.