Assembly Manual for double-layer Thermano on a pitched roof

Assembly Manual for double-layer Thermano on a pitched roof

The assembly of two layers of insulation panels provides perfect protection against cold and heat. An additional advantage is the excellent pressure and gas tightness of the entire system.

The assembly procedure of two Thermano panel layers does not differ much from the installation of a single layer.

You will need the following to install the Thermano panels:

  • THERMANO panels
  • Gauger
  • Low-pressure polyurethane foam
  • Aluminium tape
  • Vapour breathing membrane
  • Battens and counter battens
  • Set of long and short wood screws
  • Planks

The installation begins with attaching the planks to the levelled front of the rafter. The planks should be up to 30 cm in length. Next, the first row of the first layer of Thermano panels is placed. It is very important to attach the following rows in a staggered manner, that is alternately. In the case of the first thermal insulation layer, the protection of the joints between panels with aluminium tape is not necessary but recommended. The panels may be fixed to the rafter using stabilising screws. If the weather conditions are favourable at the time of installation – no wind and precipitation – there is no need to additionally secure the Thermano panels.

Thermano panels are laid successively – row after row, gradually covering the first layer of panels with the following one. The joints between panels of the second layer must be secured with aluminium tape in order to ensure maximum thermal tightness of the entire system. The vapour breathing membrane should be placed on previously laid panels at the same time that the assembly of battens and counter battens is commenced in a given row.

Screws are necessary for assembly of the substructure. The battens are fixed with short screws and the counter battens with long ones. They must pass through the batten, both layers of Thermano panels and anchor at a depth of 30 mm. The long screws should be installed alternately every 40 cm; one perpendicularly to the rafter and the next at a 67o angle, slightly flat. The proper angle is determined using the gauge provided by the manufacturer of Thermano panels. After reaching the roof ridge, remember to fill any gaps with low-pressure foam. The thermal insulation of the ridge must be continuous.


In the presented example, the investor chose very good protection for the construction. Two layers of 100 mm thick Thermano panels guarantee perfect thermal conditions inside, both during harsh winters and hot summers. The excellent thermal insulation features of Thermano panels are provided thanks to a very low lambda value. Their resistance to moisture and damage caused by vermin makes it so that the panels will serve you well for decades.