Interior Screed Group Ltd | Prepare a Subfloor for Screeding

To prepare a subfloor for screeding, follow these general steps:

Clean the Subfloor Thoroughly: Removing any debris, dirt, oil, or other substances.
Check the Levelness of the Subfloor: Use a straightedge to identify any low spots or high points.
Fill Any Low Spots: Use a self-levelling compound to achieve a smooth and even surface.
Ensure the Subfloor is Dry and Free from Any Moisture Issues: Address any dampness or water leaks before proceeding.
Install a Suitable Moisture Barrier if Necessary: This prevents moisture from affecting the screed.
Prime the Subfloor: This improves adhesion between the screed and the subfloor.
Install Edge Insulation Strips Around the Perimeter of the Room: This allows for expansion and contraction of the screed.
Finally, You Are Ready to Install and Level the Screed Mixture Over the Prepared Subfloor.

Following these steps will help ensure a successful screeding process and a stable subfloor for your flooring installation.

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What Different Types of Subfloor Systems Can Screed Be Laid Onto?

Screed can be laid onto various substrates, depending on the specific requirements of your project. Here are some common substrates onto which you can lay screed:

Concrete Substrate: One of the most common substrates for screeding is an existing concrete floor. Ensure the concrete surface is clean, sound, and primed before applying the screed.
Sand and Cement Screed: This is a traditional screeding option where the mix of sand, cement, and water is applied directly onto a suitable substrate like concrete or insulation boards.
Insulation Boards: Screed can be applied on top of insulation boards to provide both thermal insulation and a level surface for further flooring installation.
Underfloor Heating Systems: Screed can be used as a covering over underfloor heating systems to provide a level surface for the final floor finish.
Timber Subfloors: Special precautions need to be taken when applying screed over timber subfloors to prevent issues related to moisture and movement. Proper preparation and the use of appropriate membranes are crucial in such cases.
Existing Tiles: In some cases, screed can be applied over existing tiled surfaces after proper preparation and priming to create a new level surface.

It’s important to consider the specific requirements of your project and the compatibility of the screed mix with the chosen substrate. Proper preparation of the substrate is essential to ensure the longevity and performance of the screed.