How to Rectify a Screed That’s Too Thin

Steps to Rectify a Thin Screed

Assess the Situation Begin by inspecting the existing screed:

• Measure its thickness at various points.
• Check for signs of damage such as cracks or unevenness.
• Determine the intended use of the floor and the load it will bear.

Clean and Prepare the Surface A clean and prepared surface is essential for any rectification work. Remove dust, debris, and loose particles using a vacuum or a brush. If the screed is bonded to the substrate, ensure it is securely adhered.

Choose the Right Solution Depending on the extent of the problem, you can choose one of the following methods:

• Apply a Levelling Compound: For minor thickness adjustments, a self-levelling compound can add a few millimetres of depth and smooth the surface.
• Add a New Layer of Screed: If significant thickness is required, apply a fresh layer of screed over the existing one. Use a bonding agent to ensure proper adhesion between layers.
• Use High-Performance Screeds: For areas requiring additional strength, consider using polymer-modified or fibre-reinforced screeds, which can achieve strength at thinner depths.

Reinforce Where Necessary If you’re adding a new layer, consider using reinforcement such as metal mesh or fibreglass to improve the screed’s tensile strength and reduce the risk of cracking.

Ensure Proper Thickness Use a spirit level or screed rails to achieve the correct thickness during application. Double-check the depth at multiple points before allowing the screed to set.

Cure and Dry Properly Allow the screed to cure and dry as per the manufacturer’s guidelines. Avoid rushing the drying process, as this can compromise the screed’s strength and durability.