Sand screeding refers primarily to the material used to create a smooth, level layer over a base surface, most commonly on floors. It is essentially a type of mortar specifically designed for this purpose. The term "screeding" can also refer to the process of applying and leveling this material using a straight edge or screed bar.
Composition of Sand Screed
Floor screed is commonly made by mixing cement with sharp sand. The proportion of these two components is crucial for achieving the desired strength and consistency.
- Key Ingredients:
- Cement
- Sharp Sand
The most common ratio used for sand and cement screed is 1:3 or 1:4.5 (cement to sand) which gives the most suitable consistency for adding to a concrete floor unit or slab. This mix ratio influences the strength, drying time, and workability of the screed.
Purpose of Sand Screeding
The main purpose of applying sand screed is to provide a smooth, flat, and durable surface suitable for receiving various floor finishes, such as:
- Tiles
- Laminates
- Carpet
- Vinyl
It effectively covers underlying layers like concrete slabs or insulation, correcting minor imperfections and creating a uniform base essential for professional-looking flooring installations.
The Screeding Process
While "sand screeding" often refers to the material, the process involves:
- Preparing the base surface.
- Mixing the sand screed material (cement and sharp sand in the correct ratio).
- Applying the mix onto the base.
- Using a screed bar or straight edge to level the material, removing excess and filling low spots.
- Allowing the screed to cure properly before applying the final floor finish.
Understanding both the material composition and the application process is key to achieving a successful floor screed.
