Mountain resort Feuerberg in Austria scores with energy efficiency and top comfort

4,500 square metres of relaxation

Mountain Resort Feuerberg is not only energy efficient but also offers a high degree of comfort – all thanks to SWISSPACER ULTIMATE Kreuzlingen / Switzerland, June 2020

Sparkling lakes, enchanted forests and impressive mountain landscapes adorn Austria’s southern province of Carinthia. Just below the summit of Gerlitze Alpe at 1,769 metres above sea level lies the exclusive Mountain Resort Feuerberg. To enable the resort’s guests to relax and feel good all around, it was down to the architect Ronacher to consider everything down to the tiniest detail – including in the building constructed in 2019, a light-drenched bathing house. Choosing the right window structure played a decisive role when it came to comfort in the new wellness temple: It had already been decided during the planning stage to go for the triple-glazed unit CLIMATOP XN – fitted with the warm edge spacer bar SWISSPACER ULTIMATE, which has a very positive impact on energy efficiency and indoor comfort.

Since its opening in 2007, Mountain Resort Feuerberg has received numerous awards and excellence certificates. It was recently voted one of the Top 10 wellness hotels in Austria by the Relax Guide 2020, and rightly so: The premium location within striking distance of hiking trails and ski slopes, the culinary offering and the extensive wellness programme make Mountain Resort Feuerberg one of the top destinations for wellness and indulgence in Austria. The resort’s impressive alpine spa covers an area of 4,500 square metres. There are twelve pools and a solar-heated alpine meadow lake, sixteen relaxation rooms, eleven saunas and a water slide.

The central design element of the new bathing house is an elliptically shaped swimming pool with a circular dome structure made from wood. Together with the therapy facility, it connects to the resort's existing buildings. The entire architecture thus becomes a semicircle that nestles back into the slope. At the front it traps the sun and opens up the panoramic view of the mountains. At the same time, this shape ensures sufficient protection against wind and weather in the courtyard.

“In each of the 15 construction phases that we have been able to realise for the Hotel Feuerberg in recent years, wood plays a supporting role in the truest sense of the word,” says the architect Dr Herwig Ronacher. He and his architecture firm stand for ecological construction, energy efficiency and specifically for building with wood. When it comes to energy-efficient construction, the company has implemented numerous structures and completed two research projects, one of which focused on energy-efficient swimming pools made from wood. “Building in an energy-efficient manner is very important for indoor pools. The basic shape of the ellipse and the wooden dome meet this need, as they give the building a very favourable ratio of volume to surface area,” explains Ronacher.

Mountain Resort Feuerberg was one of the most challenging projects to have been designed and implemented by the architecture firm. That was mainly because of the extraordinarily high standards specified for it. The aim was therefore to go for maximum quality in every detail. A good example of this are the warm edge spacer bars from SWISSPACER, which were used in the insulating glass elements from Saint-Gobain Glassolutions Nitrasklo in the most recent phase of construction. SWISSPACER spacer bars consist of a highly insulating plastic composite material which minimises the loss of heat. They therefore prevent cold bridges and heat loss in the area around the edge of the panes of insulating glass – which prevents heat entering the building’s interior in summer and keeps the cold out in winter. Condensation, mould and the health problems these cause don’t stand a chance. Although at first glance they represent a barely perceptible detail in the overall planning, the spacer bars are essential for saving energy as well as for pleasant temperatures inside Mountain Resort Feuerberg.


Formed in 1998 Swisspacer is part of Saint-Gobain Glass Solutions. The company has experienced massive growth in the UK over the past 2 years. Its no-investment needed price benefit has been a key advantage that has attracted sealed unit manufacturers and window fabricators and fuelled its growth.

The manufacturing and head office is in Switzerland and a second manufacturing facility is established in Germany. Much investment is taking place to expand production capacity to ensure that Swisspacer is able to satisfy the dramatic ongoing growth in demand for its high performance warm edge spacer bar products.

Swisspacer has a growing network of leading sealed unit manufacturers in the UK and Ireland using its products, including Solaglas, Pilkington, Carey Glass, Supaseal, Custom Glass, Uniglaze2, Glass Systems, Clayton Glass, System 3 and Hollow Seal among others.

Swisspacer exactly matches the shape and dimensions of aluminium spacers, and being rigid and self supporting it handles in a similar way. And because there is no need to invest in expensive new machinery, it makes it very easy to get up and running with warm edge. Automated solutions are however available from Lisec, Saint-Gobain Seva and Rottler and Ruediger.

Independent tests conducted by IFT Rosenheim, the leading European independent fenestration research and test facility, showed that Swisspacer V had the best PSI values of all the other leading brands of spacer bar that were submitted for testing. Using Swisspacer thermal insulation (U-value) can be improved by up to 20%. Swisspacer V and Swisspacer perform very well in the Window Energy Rating Scheme.

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