Addition of a storey to a detached house in Kleinebersdorf

Written by Herbert Gruber

For the purpose of extending the usable living space, a complete residential unit with an additional 152 m² floor space in passive house quality was created by adding a storey.

Key data

Province:Lower AustriaCity:KleinebersdorfCompletion:2013Type of Construction:infill constructionDesign/ArchitectureArch. Heinrich SchullerCarpenter:Zimmerei GlaserStraw Builder:asbn - workshopBuilding Costs:1650,- €/m2Possibility to visit:NoPress photos:Yes
Owner Builders Contribution:Fill in straw bales, insulate facade on ground floor, asbn workshop
Residential acreage:254m2Heating demand:10U-Value (Wall):0,10W/m2KU-Value (Roof):0,10 (Flachdach: 0,09)W/m2KHeating/Ventilation System:Photovoltaic system, biomass district heating, wood-burning residential stove, comfort ventilation, underfloor heating and radiatorsCategories:Passive House, Projects Austria, Straw Bale Wrapping,
More about this Straw Bale House

In order to expand the usable living space – 115 m² had become too small for the family of five – a complete residential unit with an additional 152 m² WNfl. in passive house quality was created by adding a storey.
The pitched roof elements were insulated on site and then moved and installed by crane. The flat roof was insulated from above with straw bales. As part of an ASBN workshop, the walls on the upper floor and the façade (20 cm) on the ground floor were insulated with straw bales. The bales were harvested on site and certified by GrAT.

Zwecks Erweiterung der Wohnnutzfläche – 115 m² waren der fünfköpfigen Familien zu eng geworden – wurde durch eine Aufstockung eine komplette Wohneinheit mit zusätzlich 152 m² WNfl. in Passivhausqualität geschaffen.
Die Steildachelemente wurden vor Ort gedämmt und anschließend per Kran versetzt und montiert. Das Flachdach wurde von oben mit Strohballen gedämmt. Im Rahmen eines ASBN-Workshops wurden die Wände im OG und die Fassade (20 cm) im EG mit Strohballen gedämmt. Die Ballen wurden vor Ort geerntet und von der GrAT zertifiziert.

About the author

Herbert Gruber

Herbert is author of the book "Neues Bauen mit Stroh in Europa" (New Building with Straw in Europe), head of the austrian strawbale network ASBN and partner in the Leonardo-project "STEP" (Strawbale Training for European Professionals) and the Erasmus project "BuildStraw Pro" (a project to get formal national recognition of the training) and "Make your City Smart". As a collector he documents European straw bale buildings since 1999 on his website (database, german), in lectures, workshops and books.