Sub-base Preparation for Resin Floor Installation

How should I prepare the sub-base before installing resin?

Proper preparation of the sub-base is fundamental when installing a resin floor, impacting not only the final appearance but also its long-term durability and performance.

Step 1: Assess, Level, and Repair the Substrate

Before applying any resin system, carefully inspect the sub-base for cracks, uneven patches, or instability. Any defects should be filled and levelling completed with suitable repair mortars. The surface should be firm and free from loose sections. A level and structurally sound base ensures a seamless resin finish and reduces the risk of cracking or delamination.

Step 2: Deep Clean and Remove Contaminants

It’s vital that the base is thoroughly cleaned. Sweep or vacuum dust and debris, and use a degreasing agent for any oily spots. Surfaces contaminated with oil, grease, or chemical residues can impair resin adhesion. Make sure the substrate is dry prior to priming or resin application to prevent issues during curing.

Step 3: Prime for Optimal Adhesion

Priming helps maximise the bond between sub-base and resin. Products such as epoxyprimer are designed for use on concrete, timber, screed, or tile surfaces, creating a strong and lasting hold. Allow the primer to cure for the recommended timeframe (typically 24–48 hours) before applying the resin layer.

When this matters

Thorough sub-base preparation is especially important when installing permeable or outdoor resin floors, where drainage and long-term performance depend on solid groundwork.

Related guides

How To Slope A Resin Floor

By taking care with your substrate preparation, you’ll ensure a professional and robust resin floor installation. For more tips on achieving a properly sloped resin floor or for guidance on drainage, visit our main guide to sloping resin floors.