How do I calculate resin quantity for my 3x3m bathroom floor?

Key Formula: Area and Depth

Start by determining your total area—multiply the length by the width. For a standard bathroom, 3m x 3m equals 9m². The volume of resin needed then depends on your desired layer thickness. For self-levelling resin floors, expect to use approximately 1.1kg of mixed resin per millimetre of thickness per square metre.

• For 2mm thickness: 9m² x 2mm x 1.1kg = 19.8kg of resin required.
• Adjust thickness and calculate accordingly. Always round up slightly to allow for spillages or surface irregularities.

Special Case: Pebble or Aggregate Systems

If using a system with pebbles or decorative stones, the calculation is different. The resin acts as a binder rather than a continuous layer. To estimate:

• First, calculate the weight of stones: Stones (kg) = 15 × Area (m²) × Thickness (cm). For a 9m² area at 1cm thick: 15 x 9 x 1 = 135kg stones.
• Then, estimate resin: About 3% of the aggregate weight. 135kg x 0.03 = 4.05kg resin.

For coloured or natural stone aggregates, consider using a suitable binder such as the “Trasparente” – Epoxy Binder for Coloured Pebbles and Grits for optimal clarity and lasting appearance.

Practical Tips for Buying and Application

Always purchase a little extra resin than calculated to accommodate for edge details and minor waste. For standard solid finishes, use kits appropriate for the square metre coverage and thickness. When choosing a product, consider your intended style—seamless floors, pebble finish, or designer stone effects all have slightly different needs. The Flowstone permeable floor kit offers an all-in-one option particularly handy for outdoor or wet-room bathroom areas.