Town Hall Burgkunstadt

The Building

Building pre-intervention

Building post-intervention

On the site of the former "Altenburg ob Kunstadt", the Burgkunstädter town hall, one of the most beautiful half-timbered houses in Franconia, has formed the town's skyline for over 300 years. In 1689/90, the master of baroque half-timbered construction, Jörg Hoffmann constructed the impressive decorative half-timbered structure on the early medieval masonry base together with master builder Hans Gebelein . After an inadequate restoration in the 1970s, considerable damage was found on the entire building in 2000. The aim of the overall renovation of the old building was to preserve and emphasise the historical value of this important monument and to equip it for the demands of the present day. All structural measures were implemented in close cooperation with the client and the Bavarian State Office for the Preservation of Historical Monuments.

More Details

The Solution

Solution pre-intervention

Solution post-intervention

What is the Solution?

Replacement of 1970 Box type windows by casement windows with original appearance frame and insulating glazing (double glazing ). A classic drawn glass from the Schott company was used for the exterior panes of the insulating glass windows. This is characterised by its uneven surface, which is created by using the Fourcault method in the manufacturing process.

Why Does it work?

The original appearance of the façade could be retained and from an energy point of view the windows performed well.

PROS

a classic drawn glass from the Schott company was used for the exterior panes of the insulating glass windows
the original appearance of the façade is retained.
the windows were equipped with sun protection.

CONS

All new materials.
From an energy point of view, insulating glazing was to be installed, although this did not comply with the guidelines of the heritage office

Window Type before retrofit

Box Type Window

Window glass type

Double

Window frame material

Wood

Window position

In the middle

Shading

Interior, new materials, no shading before. Interior roller blind

Health issue

information not available

Technical drawings

Additional documentation

Town Hall Burgkunstadt.pdf

Installation Method

The existing box-type windows were completely replaced in the renovation process. In addition, they were equipped with sun protection.

Moisture Management and Technical Compatibility

information not available

Airtightness

The existing box-type windows were replaced by new casement windows with better airtightness.

Before retrofit

After retrofit

Before retrofit

Uw-Value

After retrofit

Uw-Value

1.3

Before retrofit

Ug-Value

information not available

After retrofit

Ug-Value

information not available

Before retrofit

g-Solar factor

information not available

After retrofit

g-Solar factor

Assessment

Window type

Simple window (sash/casement/sliding)

Frame material

Timber

Aesthetic impact

Low Impact (no impact or minor impact from both inside and outside)

Frame improvement

Yes

Glazing improvement

Yes

Additional glazing

Yes

Airtightness improvement

Yes

Window U-value

1 < U <= 2

Shading

Yes - reuse existing appurtenances

Circular approach

Yes

Circular approach (Additional info)

Repairing the frame instead of replacing. Most of the existing windows have been refurbished, with only a few replaced by replicas due to their poor condition. The existing windows were upgraded by replacing the original single glazing with thin, krypton-filled double glazing and adding seals to ensure airtightness.

Investment cost

Medium High