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Further requirements

As regards residential buildings and non-residential buildings, in addition to the requirement pertaining to heating demand and, in the case of other buildings, in addition to the requirement pertaining to U values, the following requirements may be laid down: › maximum permitted thermal insulation value for the building shell in the case of new buildings,

› maximum permitted thermal insulation value for the building shell when building new residential buildings with a ventilation system for living areas with heat recovery,

› maximum permitted thermal insulation value for the building shell as regards extensive reconstruction.

The provisions notwithstanding, when constructing a new building as well as when replacing or repairing the building component in question in air conditioned rooms, the following heat transfer coefficients (U values) should not be exceeded in relation to the heat-transferring building components mentioned below:

Building component External WALLS

Small WALL areas facing the external air (e.g. in the case of skylights) which do not account for more than 2% of the walls of the building as a whole which face the external air, provided ÖNORM B 8110-2 (absence of condensate) is observed.

DIVIDING WALLS between residential or commercial units

WALLS facing unheated parts of the building which are to be kept free from frost (with the exception of roof voids)

WALLS facing unheated roof voids or those that have not been extended

WALLS facing other structures along the boundaries of plots of land or building sites

WALLS AND FLOORS WHICH ARE IN CONTACT WITH THE GROUND

WINDOWS, FRENCH WINDOWS, GLAZED or UNGLAZED DOORS (relative to the test standard measure) and other vertical TRANSPARENT BUILDING COMPONENTS facing unheated building parts

WINDOWS and FRENCH WINDOWS in residential buildings facing the external air (relative to the test standard measure)

Other WINDOWS, FRENCH WINDOWS and vertical TRANSPARENT BUILDING COMPONENTS facing the external air, GLAZED or UNGLAZED EXTERNAL DOORS (relative to the test standard measure)

ROOF WINDOWS facing the external air

Other TRANSPARENT BUILDING COMPONENTS facing the external air, horizontally or at an angle

CEILINGS facing the external air, roof voids (thoroughly aired or not insulated) and above passages as well as SLOPING ROOFS facing the external air

INTERNAL CEILINGS facing unheated parts of buildings INTERNAL CEILINGS facing separate residential and commercial units

There are additional requirements regarding



heat distribution,

› heat accumulators, › heat recovery, › avoidance of thermal bridges,

EPBD Buildings Platform > P124_Austria_June 2008

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0.35 0.35

0.70 0.90 0.60 0.35 0.50 0.40

2.50 1.40

1.70 1.70 2.00

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