Common questions about screed [ Infographic ]

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Posted on 21 October 2024

Screed is an essential component in construction, particularly in flooring projects. Despite its importance, many people have questions about what screed is, its types, and how it’s applied. Whether you’re a homeowner planning a renovation or a contractor managing a project, understanding screed can help ensure you achieve a smooth, level floor finish. Here, we answer some of the most common questions about screed.

common questions about screed

What is Screed?

Screed is a layer of material, typically a mixture of cement, sand, and water, that is applied to a floor base. It creates a smooth, level surface for final floor coverings like tiles, carpet, or wood. Screed can also be used to encase underfloor heating systems, providing an even distribution of heat. There are different types of screed, each suited for specific applications, including traditional cement screed, liquid screed, and fast-drying screed.

What Are the Different Types of Screed?Screed Suppliers in Scunthorpe

There are several types of screed, each designed for different purposes:

  1. Traditional Cement Screed: This is the most common type, consisting of sand, cement, and water. It’s typically applied by hand and can be used for most flooring projects. However, it requires a longer drying time compared to other types.
  2. Liquid (Flowing) Screed: Liquid screed is a more modern solution, known for its ease of application and quick drying time. It’s self-levelling, which makes it ideal for large areas. This type is often used with underfloor heating systems due to its excellent thermal conductivity.
  3. Fast-Drying Screed: As the name suggests, this screed is designed to dry quickly, often within 24-48 hours. It’s ideal for projects with tight deadlines, though it can be more expensive.
  4. Bonded, Unbonded, and Floating Screed: These terms refer to the way the screed is applied. Bonded screed is directly adhered to the substrate, unbonded screed is laid over a membrane, and floating screed is placed over an insulation layer, commonly used in conjunction with underfloor heating.

What is the Purpose of Screed?

Screed serves several purposes in construction:

Levelling the Floor: Screed creates a smooth, level surface, which is essential for laying floor coverings.  

Encasing Underfloor Heating: When used with underfloor heating systems, screed ensures even heat distribution and protects the heating elements.

Adding Strength: Screed can add structural strength to a floor, particularly in commercial or industrial settings.

How is Screed Applied?

The application of screed depends on the type being used:

Traditional Cement Screed: This is usually mixed on-site and applied by hand using a trowel. It’s spread across the floor area, then levelled using a straightedge or screeding board.

Liquid Screed: This is poured or pumped onto the floor, where it levels itself. Because it’s self-smoothing, it requires less manual effort to achieve a perfectly level finish.

Fast-Drying Screed: Applied similarly to traditional screed but with the added benefit of quicker drying, it’s ideal for time-sensitive projects.

After application, screed needs time to cure before any floor coverings are installed. The curing time varies depending on the screed type, thickness, and environmental conditions.

How Long Does Screed Take to Dry?

The drying time for screed can vary significantly. Traditional cement screed typically takes 1mm per day to dry, meaning a 50mm layer could take 50 days. Liquid screeds dry faster, but they still require several days to weeks, depending on thickness. Fast-drying screed, as mentioned, can be ready in as little as 24-48 hours. It’s crucial to allow the screed to dry fully to avoid moisture-related problems with the final floor covering.

Gyvlon Flowing Screed in DoncasterCan Screed Be Used Outdoors?

Yes, screed can be used outdoors, but it needs to be the correct type. For external applications, a polymer-modified screed is often used due to its improved strength and resistance to weather conditions. This type of screed is commonly used for patios, driveways, and other outdoor surfaces that require a smooth, durable finish.

How Thick Should Screed Be?

The thickness of the screed depends on its application. For bonded screed, a minimum thickness of 25-40mm is recommended. Unbonded screed should be at least 50mm thick, while floating screed (used over insulation or underfloor heating) should be 65-75mm thick. It’s essential to get the thickness right to ensure the screed’s durability and performance.

What Are the Common Problems with Screed?

While screed is generally reliable, problems can occur if it’s not mixed, applied, or cured correctly:

Cracking: If the screed dries too quickly or if the mix is incorrect, it can crack. This can be mitigated by using control joints or reinforcement fibres.  

Curling: This happens when the screed dries unevenly, causing the edges to lift. Proper curing and the use of a curing agent can help prevent this.

Moisture: Insufficient drying time can trap moisture, leading to issues with floor coverings. Always ensure the screed is fully cured before laying any final flooring.

Screed is a vital element in creating a smooth, level floor, whether in residential, commercial, or industrial settings. Understanding the different types, their applications, and potential challenges can help you make informed decisions about your flooring project. Whether you’re working with traditional cement screed or a modern liquid alternative, proper application and curing are key to achieving a durable, high-quality finish.

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