Schlüter-TROBA  Surface drainage sheet

Schlüter-TROBA is a reliable and permanently effective drainage system for use over sloped waterproofing layers. It consists of a perforated, pressure-stabilised studded polypropylene sheet and forms hollow chambers between the waterproofing assembly and the gravel or crushed stone layer.

Any seeping water penetrating the covering assembly passes through the lateral perforations of the trapezoid studs to the sloped waterproofing layer, where it runs off freely through the drainage cavities.

• Provides reliable drainage
  Rapidly removes seepage water to prevent water accumulation beneath terraces, balconies, and paved surfaces.
• Protects the waterproofing membrane
  Prevents mechanical damage from gravel, paving, and construction loads.
• Prevents frost and moisture damage
  Eliminates standing water that can cause freeze-thaw damage and premature deterioration.
• Extends system lifespan
  Preserves the performance of the waterproofing and drainage system for long-term durability.
• Maintains drainage under load
  Pressure-resistant studded design ensures continuous water flow even under heavy loads.
• Fast and easy to install
  Loose-laid installation reduces installation time and complexity.
• Durable and weather resistant
  Rot-proof, ageing-resistant polyethylene withstands harsh outdoor conditions and temperature extremes.
• Reduces maintenance and repair costs
  Protects the construction, minimizing lifecycle costs and improving long-term reliability.

1. The load bearing substrate and the waterproofing layer placed on it according to DIN 18531 must have an adequate slope for drainage and be connected to the designated drainage exit.
2. TROBA is placed loosely over the waterproofing assembly independent of the slope. Adjacent lengths are placed and overlapped along the flat edges, while the ends of two courses are overlapped by at least one row of dimples.
3. The surface assembly is installed directly over the placed TROBA according to current industry standards.
4. Note: We recommend the profiles from our product range for edging profiles, movement joints and floor-wall transitions.

The drainage sheet consists of a pressure-stable polypropylene sheet with a structure of trapezoid-shaped, 8 mm deep, studs. To allow penetration of seepage water, the longitudinal sides of the studs feature small holes. The contact area of the drainage sheet is approx 50%; vault-like drainage spaces constitute the remaining 50%. The material is non-rotting and dimensionally stable in a temperature range from - 40 °C to + 80 °C.

Material properties and areas of application

TROBA is primarily installed in horizontal applications, over sloped waterproofing layers, according to DIN 18531. It provides an effective drainage layer between the waterproofing layer and the surface assembly above. Its main areas of application are balconies and terraces, which have been waterproofed.

The loosely placed TROBA is adequately stable against mechanical stress during the installation process, for example from being walked on or driven over by wheelbarrows used for the transport of required material.

The cover construction, consisting of self-supporting pavers or stone slabs, can be installed over gravel or crushed stone. TROBA prevents the stones from sinking into the bitumen waterproofing.

Water that penetrates the mortar bed is guided, under normal gravitational force, through the drainage cavities of TROBA toward the drainage exit.