Pretty energy-conscious

Not too hot and not too cold. Whether freezing cold or scorching hot – we can offer perfect solutions for every temperature. Cantilevered roofs or balconies are insulated in the element so that there are hardly any thermal bridges. It goes without saying that LIGNATUR is suitable for Minergie and passive house constructions.



Explanation videos on heat insulation

So that the winter cold and the summer heat stay outside, good insulation of the building shell and the roof is required as well as the avoidance of thermal bridges in component transitions from the interior to the exterior. Careful, detailed planning is the be-all and end-all.

In the films, our consultants explain how it's done with LIGNATUR.

Would you like to learn more? Contact our team.

Contact details consultant


Thermal transmittance U-value (W/(m²K)

LIGNATUR elements can be used in pitched roof as well as flat roof constructions. With ­sloping roofs the elements span from gable wall to ­gable wall or conventionally from eaves to ridge. ­LIGNATUR elements are ideal for widely spanned flat roof structures with perfect thermal properties. For projecting roofs or balconies we offer developed solutions without thermal bridges.

On the following pages we have calculated some structural-physical values for various element heights and insulation thicknesses.

Thermal transmittance

Thermal bridges

For the calculation of the energy performance certificate according to SIA 380 / 1 respectively GEG thermal bridges must be proofed. In timber construction the details often show no thermal bridges or even show negative Psi(ѱ)-values. To offer you some guidelines for preplanning stage, we have calculated some standard details for linear thermal bridge coefficients.

Conditions limits:
Θe = -10.0°C outside
Θi = 20.0 °C inside

Heat transfer resistance
Rse = 0.13m2K/W outside heavily ventilated
Rse = 0.04m2/K/W outside standard
Rsi = 0.13m2K/W inside standard

λ = Thermal conductivity on the thermal insulation

Joint sealing

For permanent airtightness of the element joint we offer an airtight sealing cord. It is adhesive on both sides and combines high adhesive power, durability and adaptability. On request, we can interrupt the tongue at the bearing of the element and fill in the groove. The end of the sealing cord has to be pressed onto the bearing on site.

Vertical sealing cords at the bearing details have to be attached on site. The details, have been tested at the ift Rosenheim and have successfully passed several blower door tests.

Further sealing work for air and wind-tight details, like for example the bearing cross to the element in direction of the bearing, has to be done on site. Accurate carrying out is only possible if it has been defined previously in the planning process.

Joint sealing