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Thermal Insulation Ordinance 1995

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The Thermal Insulation Ordinance („Verordnung über energiesparenden Wärmeschutz bei Gebäuden (Wärmeschutzverordnung - WärmeschutzV)“) was reissued on 16 August 1994; this version was effective by 1 January 1995.

The purpose was above all to tighten the requirement level. This intensification turns out inconsistent for new buildings because of the comprehensive methodical changes: dependent from the surface volume ratio about 25-30 % (benchmark yearly heat demand of buildings on the level of the Thermal Insulation Ordinance 1982/84, calculated with the method of the Thermal Insulation Ordinance 1995)

On the other hand, technical developments had to be taken into consideration methodically:

Until then, the Thermal Insulation Ordinance only took transmission losses into consideration. However, particularly concerning windows this is not correct – thermal radiation that enters the building also contributes to the heating in the heating period. With the introduction of low-E-glasing on the market in the beginning of the 1990s, windows with certain design and orientation can have a positive energy balance. The Thermal Insulation Ordinance should take that into account. The ordinance does this with the balancing of solar profits – also simplified possible through the use of "equivalent coefficients of heat transmission".

On this background it became necessary to introduce a heat balance for new buildings and to convert the requirement methodology to one energy value, the yearly heat demand.

With the introduction of the heat balance another aspect could be taken into account: the possibility, to limit ventilation losses through heat recovery. The definition of relatively high air exchange rates is to be understood as a signal for the then newly introduced mechanical ventilation units for heat recovery.

Concerning the requirements on existing buildings, follows the Thermal Insulation Ordinance 1995 the pre-existing versions by so called "conditional requirements". However, the Thermal Insulation Ordinance 1995 inscribes to this area a special “Appendix 3” that henceforth also includes requirements to the refurbishment of buildings with low indoor temperature.

Furthermore, additional changes of the structure (e.g. abolition of special regulations for sport and assembly facilities, centralisation of the regulation of scope and exceptions) were carried out with the consequence, that the requirements of the Thermal Insulation Ordinance 1995 cannot be compared with those from the Thermal Insulation Ordinance 1982/84 offhand.

For § 12 of the Thermal Insulation Ordinance 1995 (heat demand certificate) a general administrative regulation was enacted with the approval of the Bundesrat, that was also effective by 1 January 1995.

The federal states are responsible for the enforcement of the energy saving legislation according to the constitution. In the course of the implementation of directives concerning energy saving arise questions, especially in the beginning, that cannot be answered out of the legal text alone or from norms taken out of context and make different interpretations possible.

To allow in this context an implementation of the Energy Saving Ordinance as consistent as possible, the Expert Commission on Construction Technique (formerly “Expert Commission on Building standards”) of the Conference of Ministers of Construction and Housing decided to install a working group. This working group shall answer incoming questions of common interest. The draft answers of the working group are discussed and finally released by the Expert Commission.

For the Thermal Insulation Ordinance 1995, 22 interpretations were published

The Thermal Insulation ordinance was replaced by the Energy Saving Ordinance on 1 February 2002. The currently valid requirements for the thermal insulation of buildings result from the Energy Saving Ordinance 2009.

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