Instructions for installing Thermano on an extensive green roof.

 

Instructions for installing Thermano on a green roof

A green roof is a great idea for converting a flat roof into a place of rest and leisure. Make no mistake, a green roof is not a complex project, especially if you use Thermano thermal insulation sandwich panels with a hard PIR core.

Given its superior thermal insulation performance, brick-wall strength and resistance to moisture, Thermano is a perfect solution for the thermal insulation of green roof structures.

Boasting the highest thermal insulation rating class of A++, Thermano sandwich panels simplify the design of a green roof: a thermal insulating layer made from Thermano is thinner than conventional solutions, at the same level of performance.

 

Step-by-step installation of Thermano on a green roof

In the case of a green roof, installing the thermal insulation is only one stage of an entire project. This video presents the installation process, step by step, from substrate preparation to planting.

1.  Begin by laying the vapour barrier. Remember to turn the sheet onto the attic walls and to thoroughly cover the joints between the sheets with aluminium tape.

2.  Next, begin laying the first layer of Thermano panels. Start from the attic side, after removing the panel lock, making sure that the Thermano panels fit the edge perfectly. For the same reason, precisely cut the panels at the corners.

3.  Since the slab has the slopes necessary for water drainage, also cut the Thermano panel edges at the slope edges. 

4.  Cut the panels around any irregularities of the slab as well.

5. After laying the first layer of Thermano panels, seal the panel joints with aluminium tape.

6. Lay the second layer of panels, in a staggered pattern. Remember to secure joints with aluminium tape here as well. Regularly check the system slope using a long spirit level, to correct any irregularities in the panel cutting.

7. Thermano panels never perfectly adhere to attic edges and other panels, therefore seal all gaps with low pressure foam. This will maintain system sealing.

8.  To maintain thermal insulation continuity on the building, also fit the Thermano panels to the attic walls. In the given example, the panels are attached using low pressure foam.

9.  The next step is to phase the corners between the attic wall and the slab surface. This can be done using corner wedges, e.g. made of Thermano panels or very hard mineral wool. This is important due to the technical aspects of the waterproofing, which should not be bent at excessive angles. Corner phasing reduces the angle, thus eliminating the risk of cracking, especially at low temperatures.

10.  The next stage consists in laying a self-adhesive base asphalt roofing on the layers of Thermano panels. Turn the excess asphalt sheeting to cover the attic wall as well.

11.  After laying the base layer, install suitable waterproofing in the form of heat-sealing top asphalt sheeting. Lay the sheets directly on the base asphalt roofing, while remembering to secure the attic.

12.  The next step is to lay the stud membrane. This is the drainage layer for the entire system, and the purpose is to drain excess water from the vegetative layers. Lay the membrane studs upward.

13. Thus prepared, the substrate enables the installation of two geotextile layers, with leca in between. The purpose of the geotextile is to block infiltration of fine fractions from the higher layers, which can contaminate and block the drainage layer. However, leca, like the stud membrane, drains away excess water, while accumulating the dampness required by the vegetative substrate. However, a leca layer is not required by the entire system and can be omitted where not required.

14. Lay the soil or the vegetative layer only on the prepared roof layers. This provides the substrate and the source of minerals for the plants.

15. An essential component of this stage is the installation of the masonry band around the roof circumference. Its main purpose is to support the pressure of the wet soil on the waterproofing and thermal insulation layers on the attic wall. In addition, the band facilitates mowing of the lawn and constitutes an interesting aesthetic component.

16. The penultimate stage to fit the irrigation system tubing.

17. Finally, plant the grass or lay the turf.

18. Thermano is a non-absorbent and strong material. Panels can support a pressure of 20 tonnes per square metre. This is essential for green roofs under high loads.

 

If you install a Thermano thermal insulation system...

  •  You will feel and be secure. Your green roof will be perfectly safe from its greatest enemy: the pooling of moisture. The PIR sandwich panels resist moisture, so that their thermal insulating performance does not degrade over time.

  •  You can have a green roof installed where it was never possible before. The relatively low thickness of Thermano sandwich panels has often been pivotal in the decision to replace traditional insulating materials, and allowing the roof design to be modified to permit greenery

  • You go green. Good thermal insulation means a smaller footprint of harmful airborne pollutants.

 

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If you have any questions, please contact our Thermano technical consultants:

tel. +48 801 000 807