Musikschule Velden

The Building

Building post-intervention

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The former fire station is a listed building, which was built in 1926 by architect Franz Baumgartner in the style of the architecture at the lake Wörther See. It is now used as a music school. The building is characterised by its strongly articulated gates on the main street façade. The large roof area is broken up by an enormous front gable. The building comprises two full floors, an attic, a partial basement and a turret room. The market town of Velden am Wörthersee implemented a comprehensive thermal-energetic renovation of the building. This renovation was carried out within the framework of the demonstration programme “Mustersanierung”. The innovative measures and the project documentation were funded by the Austrian Climate and Energy Fund. The building achieved the klimaaktiv GOLD standard, an Austrian rating system for the sustainability of buildings.

More Details

The Solution

Solution pre-intervention

Solution post-intervention

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What is the Solution?

The roof was renovated while preserving the original wooden structure, which was reinforced from the inside. To improve the thermal performance, an additional layer of cellulose insulation was installed on the interior side. The existing roof covering was fully renewed, maintaining the original appearance but restoring the historic colour. The choice of cellulose provided ecological benefits and improved summer overheating protection, while ensuring compatibility with heritage conservation requirements.

Why Does it work?

The appearance of the roof was kept, but the colour changed to the original. Cellulose was chosen as a insulation material with regards to protection of historical monuments, ecology and summer overheating protection.

PROS

Improved thermal efficiency significantly (U-value decreased from 2.092 W/m²K to 0.093 W/m²K).
Maintained architectural integrity, important for a listed building.

CONS

Internal adjustments may limit the extent of possible insulation due to space constraints.
The color change, while minor, could affect the building's historical authenticity.

Insulation material

beams with cellulose fibre insulation

Insulation thickness

300

Thermal conductivity

0.039

Health issue

information not available

Technical drawings

Schnitt_Dach.jpg

Additional documentation

Installation Method

For Musikschule Velden, the old roof was completely removed and replaced with a new timber roof. Wood fibre insulation (32 cm) was installed over the new structure, under a zinc-titanium metal covering. The intervention is not reversible, highly invasive since it replaced the entire roof, and no original roof structure or appearance was preserved.

Moisture Management and Technical Compatibility

A vapour control membrane was installed on the warm side of the insulation to prevent moisture from accumlating into the structure, while a diffusion-open membrane was placed on the cold side of the insulation to prevent water infiltration and still allow vapour to escape.

Airtightness

The airtightness of the roof was realized using membranes. The building as a whole achieved very good air tightness values with an n50 value (Blower Door Test) of 0.78 1/h.”

Before retrofit

After retrofit

Before retrofit

Roof thickness

227

After retrofit

Roof thickness

536

Before retrofit

Roof build-up

Eternit_board [5 mm], Diffusion_open_sealing [1 mm], Wooden_batten [20 mm], Solid_wood_beam_with_cellulose_infill [160 mm], Vapour_control_layer [1 mm], Visible_wooden_boarding [40 mm]

After retrofit

Roof build-up

Eternit_board [5 mm], Diffusion_open_sealing [1 mm], Wooden_batten [20 mm], Solid_wood_beam_with_cellulose_infill [160 mm], TJI_beam_with_cellulose_insulation [300 mm], Vapour_control_layer [1 mm], Wooden_planking [24 mm], Gypsum_board [25 mm]

Before retrofit

U-value

2.092

After retrofit

U-value

0.093