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2 > Status of the implementation

Calculation procedures

The calculation procedures (art. 3) are part of the revised energy requirements. Calculation of the net energy demand is proposed for all building categories as part of the new building code. The certification process will be based on the same procedure; the suggested rating procedure will be based on delivered energy. A new national standard for calculating energy performance in buildings, NS3031:2007 was published in October 2007. The revised energy requirements are based on the new national standard.

Requirements for new buildings and major renovations

The requirements for new buildings will come into force for building permits requested after 1 February 2007. There will be a two and a half year overlap with existing requirements. Extracts from the Building Code regarding energy matters:

Building performance in a cold climate can be a challenge.

§ 8-2: Use of energy

This clause will partly implement Directive 2002/91/EC on the energy performance of buildings (letter A in the introduction: Legal Context). Construction works will be located and carried out, with due consideration of the local conditions, to improve energy efficiency.

§ 8-21: Energy efficiency requirements All buildings must meet the requirements of energy performance under this clause, either according to letter a) - energy efficiency performance or letter b) – total net energy consumption. Minimum performances according to letter c) must not be exceeded under any circumstances.

For the calculation of floor area, the definitions given NS 3940 will apply. For dwellings erected with traditional construction methods, like timber log houses, only letter c) under this clause shall apply. For leisure dwellings under 150 square metres and leisure dwellings using the timber logging technique, only letter c) under this clause will apply. For leisure dwellings under 50 square metres § 8-21 does not apply.

a) Energy efficiency performance

All buildings must meet the following requirements: › Total area of glass, windows and doors: a maximum of 20 percent of the heated floor area (sqm)

Development of U-Values exterior wall over time.

› U-value -exterior wall: 0.18 W/sqm K › U-value –roof: 0.13 W/sqm K › U-value -exposed floors: 0.15 W/sqm K › U-value – windows and doors: 1.2 W/sqm K › Standardized value for thermal bridges must not exceed 0.03 W/sqm K for dwellings and 0.06 W/sqm K for other buildings

› Air tightness: 1.5 air changes per hour by 50 Pa pressure difference. For dwellings the value of 2.5 air changes per hour by 50 Pa pressure difference applies

› Heat recovery of ventilation air in ventilation equipment (year mean heat recovery rate): 70 %

› SFP factor (specific fan power): - Commercial buildings: 2.0/1.0 kWh/m3s (day/night) - Dwellings: 2.5 kWh/m3s

› Automatic equipment for shading or other precautions to avoid the use of local cooling systems

EPBD Buildings Platform > P85_EN_Norway-June 2008

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