Walkways on Roofs and Plaza Decks

General Information Regarding Paving Slabs on Roofs and Garage Roofs

Drainage

Drainage on roofs

As opposed to landscaped rooftops where water is to be held back and run-off is to be delayed, walkways and driveways need most of the rainwater to be quickly drained off the surface. Hence, the drainage points should allow for 2 levels of drainage: at the surface level and at the lower drainage level. The ZinCo product range provides the necessary systems and accessories to cater for this.

Gradients

Gradients of roofs

The state and local standards determine a minimum gradient of 2 % for the waterproofing level, but they also regulate constructions with smaller gradients. “Stilted paths” can be built at 0° slope, as the rainwater is drained away standing water is therefore no issue. Concrete or asphalt flooring should be built with a minimum slope of 1.5 %, paved flooring with a gradient of at least 2 %.

What is more, the drainage of the relevant area should not be done in the direction of the building. All this must be considered in the preliminary planning stages.

The Most Common Usage of Rooftops: A Combination of Paths and Landscaping.

Walkways on roofs

If walkways and driveways are combined with Green Roofs, not only the drainage and the compressive strength of the system are important, but also its water retention capacity. With ZinCo Floradrain® FD 40-E as core element of the construction, all requirements are fulfilled for a long-lasting functionality. Depending on its laying procedure, FD 40-E will either retain water or let it pass through. Particular attention during planning and implementation should be paid to the transition areas between the paving slabs and the landscaping.


Hard landscape

System Build-Up

  • 1: Paving e.g. concrete paving slabs, min.
    2 in., joints filled with bedding material
  • 2: Bedding layer, 1.2–2 in. well graded coarse sand, lime free, sieve size 3/8 in. to # 100
  • 3: Drainage layer Floradrain® FD 40-E, filled with bedding material
  • 4: Protection layer Protection Mat SSM 45
  • 5: Root Barrier WSF 40 (optional)
System Build-Up
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Soft landscape

System Build-Up

  • 1: Plant layer according to plant list
  • 2: Growing Media "Zincoblend I",
    depth: ca. 5.0 in. (ca. 125 mm)
  • 3: Filter layer Filter Sheet SF
  • 4: Drainage Element Floradrain® FD 40-E
  • 5: Protection layer Protection Mat SSM 45
  • 6: Root Barrier WSF 40 (optional)
System Build-Up
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Standard Architectural Details:
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Find more formats (.dxf, .dwg) in our download center.

Technical Data

Build-up height:
from 5 ¼ in.
Weight, saturated:
ca. 48 lbs/sq. ft.

Technical Data

Build-up height:
from 6 ¾ in.
Weight, saturated:
ca. 42 lbs/sq. ft.