Unused flat roof, Underground concrete, cold bonding, with ballast

  1. for example: Gravel
  2. Separation and protection layer
  3. High polymer seal
  4. GLAPOR k-2k cold bonding mass
  5. GLAPOR foam glass boards
  6. GLAPOR k-2k cold bonding mass
  7. Bitumen primer
  8. Concrete ceiling

Description of the application

The GLAPOR flat roof is a compact and under flow secured bonded flat roof construction.

The thermal insulation is installed free of thermal bridges using GLAPOR k-2k cold adhesive on the substructure.

The sealing system conforms to the legal and normative regulations for the respective intended use.

The minimum roo fpitch of the flat construction of 2.0% should be respected. The GLAPOR gradient system with different slopes is available.

To avoid concentrated drainage GLAPOR roof riders are available in different versions.


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Advantages of the GLAPOR flat roof systems: 

Quality: Cellular glass products manufactured with proprietary technology and professional quality control.

Service: Expert advice from planners, structural engineers, construction experts and contractors.

Efficiency: Very long service life of the system constructions with minimum maintenance.

Sustainability: Made from 100% recycled glass, we guarantee consistent material properties over the entire usage time.

Safety: GLAPOR cellular glass insulation panels are diffusion-tight. When installed with closed joints, a vapor barrier is not required.

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Planning notes / Execution notes

A vapor barrier is not required when using GLAPOR cellular glass insulation because GLAPOR cellular glass boards are vapor-tight.

The underground should be level, gem. DIN 18 202, designed to be load bearing and dry and free from residues (oil, grease, etc).

10 kN / m² can be assumed without proof for the wind resistance of fully glued roof systems with GLAPOR foam glass and GLAPOR flex hot bitumen.

Fire protection “Hard roofing” according to DIN 4102-7 – Cellular glass panels belong to building material class A1. The thermal insulation is not flammable. For the component “roof”, the state building regulations require, in addition to the classification in a building material class (A1) usually a so-called “hard roofing”. This is to ensure that the roof structures are resistant to spreading fire and radiant heat. For the manufacturers of waterproofing systems, these tests with the different seals are available.

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The thickness of the cellular glass insulation comply with the lawful and object-specific requirements of the heat transmission (U-value of the element). Please check our data sheets.

The minimum thickness of the thermal insulation is 40mm. Tapered insulation systems starts by a thickness of 30mm. With a multi-ply shift were the insulations boards stick together among each other with GLAPOR flex hot bitumen. The use of the bonding with the insulations boards among each other is ca 2-3 kg GLAPOR flex hot bitumen.

The use of the bonding with the insulations boards on the underground is conditional on his evenness and is ca. 5-8 kg GLAPOR flex hot bitumen. The overlaying of ridges and throats were processed by emery boards by the shift of the tapered insulation systems.

The minimum roof pitch of 2% should be aspire. Roof pitches under 2% are special construction and need a special shift of tightening lanes.

The processing temperature of the bitumen is ca. 150-180°C.

The flat roof rules and regulations of the tightening lane producers are important for the shift of tightening lanes. If you use a rich polymer single-layer tightening, you need a hot bitumen drain at the GLAPOR cellular glass boards. The use is ca. 2,0 kg/m² roof area.

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Installation instructions

Prepare concrete surface or mineral substrate with bitumen primer.
Consumption approx. 150 g / m²

Distribute GLAPOR cold bitumen adhesive on the prepared concrete pavement.
Consumption depending on the substrate 3.5 - 4.5 kg / m²

Coat GLAPOR cellular glass boards in the stack on two side surfaces with cold bitumen adhesive with a toothed spatula / tooth trowel.

Install GLAPOR foam glass panels in mitre. Insert diagonally with the adhesive coated sides of the GLAPOR foam glass plates in front.

Apply a cell-filling, full-surface top coat with cold bitumen adhesive.
Consumption approx. 2kg / m²

Weld the entire surface of the waterproofing bituminous membrane on the top coat of cold bitumen adhesive.
Note: Welding of the waterproofing membranes directly on the cellular glass boards - without top coat - is not possible!

Then distribution of gravel.