Terrace Waterproofing — Walk-On Liquid Rubber

Terrace waterproofing with liquid rubber gives you a walk-on, weatherproof finish that lasts 5–7 years between refresh coats. The same product seals concrete, screed and existing tiled terraces without removing the tiles — saving time, money and skip hire. This page covers when liquid rubber works on a terrace, what coverage to expect, and how to integrate it with new tile installations.

Two ways to use it on a terrace

Direct walk-on finish — apply 2 cold coats on the prepared substrate, leave to cure 28 days, walk on it directly. The cured rubber surface is grippy enough for normal foot traffic but not as polished as tile or stone. Suited to private gardens, balconies and discreet courtyard terraces.

Bonded waterproofing under new tiles — apply 2–3 coats as a primary waterproofing membrane, then install tiles on adhesive bed over the cured rubber layer. This complies with ETAG 022 (Liquid Applied Roof Waterproofing Kits) and gives you the bombproof tile finish on top of a flexible elastic membrane.

Where terrace liquid rubber works best

  • Existing intact tiles with hairline cracks — overlay direct, no removal needed
  • Bare screed surfaces — applies straight to clean dry screed
  • Concrete terraces — direct application after light surface preparation
  • Old asphalt or rolled bitumen terraces — bridges hairline cracks, seamless overlay
  • Wooden deck (with limitations) — works on sound timber but not over rotted boards

Material needed for terraces

For a typical UK home terrace of 20–40 m²:

  • 20 m² (small terrace): 0.32 kg/m² × 20 = 6.4 kg + 10 % buffer = 7 kg → 1 × 6 kg + 1 × 1.2 kg → £92 material (~£4.60/m²)
  • 30 m² (medium): ~10 kg → 1 × 6 kg + 1 × 3.5 kg + 1 × 1.2 kg → ~£139 (~£4.65/m²)
  • 40 m² (large): ~14 kg → 2 × 6 kg + 1 × 3.5 kg → £177 (~£4.40/m²)

Anti-slip option for wet conditions

For terraces in regular wet use (after rain, near pools), an anti-slip aggregate can be broadcast into the wet first coat before the second coat is applied. This gives a textured surface for safe footing in the wet without compromising the waterproof membrane. The aggregate is fully bonded into the cured film.

For detailed application on existing tiles see our Balcony waterproofing without tile removal guide. For the technical background on bonded membranes under new tiles, see the Balcony waterproofing landing page.