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A residential building in Surduk received both thermal and waterproof insulation on the flat roof and terrace.

Two types of waterproofing were applied:

  • Roof: synthetic waterproofing membrane
  • Terrace: liquid polyurethane waterproofing

I. ROOF

The roof had a vapor barrier (Condor) already installed, onto which our team laid the primary thermal insulation:

  • EPS A120 expanded polystyrene, thickness 15 cm
  • Gradient thermal insulation also EPS A120, to form roof slopes
  • Vertical insulation (parapets) with 5 cm EPS and 2 cm on the parapet cap

After thermal insulation, the investor hired a separate contractor to pour the sloped screed.

Once the screed had dried and cured, a PVC membrane Thermofol M15 by German manufacturer Bauder was installed, over a protective geotextile layer (500 g/m²).

Roof elements installed:

  • 4 horizontal PVC drains, Ø75 mm
  • 2 PVC venting caps

Total waterproofed roof area: approx. 105 m².

Photos during and after roof works:

II. TERRACE

On the walkable terrace:

  • Base thermal insulation: EPS A120, 10 cm thick
  • Gradient insulation: EPS A120 before screed
  • After screed curing, liquid polyurethane waterproofing (Sikalastic 614) was applied beneath the ceramic tile system

Substrate preparation:

  • Sika Concrete Primer (for concrete areas): two-component system mixed as per manufacturer’s instructions
  • Sika Metal Primer (for metal anchor plates of the railing)

Waterproofing system:

  • First layer: Sikalastic 614
  • Reinforcement mesh (Sika Reemat Premium) embedded in the second layer
  • Final (third) layer: Sikalastic 614 with quartz sand broadcast (Ø0.4–0.7 mm)

The terrace was then waterproofed and ready for tile installation.

Total waterproofed terrace area: approx. 21 m².

Photos during and after terrace works: