Småhus, flerbostadshus och förskolebyggnader - Svanen

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Nordisk Miljømerking Hus, leiligheter og barnehager 089/versjon 2 Høringssammenstilling, oppdatert 10. august 2010 Veidekke Bostad Sverige Några ytterligare aspekter som saknas och som borde premieras i en Svanmärkning: - En begränsning av elektromagnetiska fält. Femledarsystem i fastigheten bör installeras. Nordisk Miljømerkings kommentar Tack för kommentarerna och goda förslag på fördjupning. Frågan om elektromagnetiska fält har delvis behandlats i bakgrundsdokumentet och man har beslutat att hantera frågan vidare till nästa kriterieversion. Construction polyurethane industry of Finland (CPIF): + BING, Europe The following examples demonstrate the impact of insulation products on the environmental performance of the building. An Ecolabel cannot pretend to provide for the best environmental solution if such fundamental impacts are neglected. Example 1: Impact of insulation materials on the building footprint Insulation material B has a thermal conductivity which is twice as high as that of insulant A. Hence, in order to achieve the same thermal resistance for an outside wall, the insulation layer using insulant B 2 Environmental Improvement Potentials of Residential Buildings (IMPRO-Building), JRC 2008 needs to be twice a thick. For a low energy building, the difference in thickness can realistically be estimated at 15 cm. If the overall façade length of the building is 60m, the buildings footprint increases by 9.0 m 2 when insulant B is used. 1,000 such buildings would occupy 9,000 m 2 of additional land with all the financial and environmental consequences. Example 2: Impact of insulation materials on overall material use The above example is developed further. Insulant B has not only a higher thermal conductivity but is also much heavier (examples see below). This will lead to longer and more solid fixing devices and thicker outer walls which larger window boards. It will also require a larger roof and longer and larger studs. In particular in the case of flat roofs, heavier insulation layers may require a stronger roof structure with larger beams, stronger structural walls and foundations. In other words, when insulant B is used, the overall material use for the whole building will be much higher when compared to insulant A. Without assessing this complex interaction between building products, it will be impossible to determine to real environmental footprint of each product and the building as a whole. Example 3: Impact of end-use application on total embodied energy of insulants A 100 m 2 roof is to be insulated guaranteeing a thermal resistance of 3.33 m 2 K/W. What is the embodied energy of the insulation materials for this application? Thermal conductivity Thickness Weight Embodied energy Total embodied energy (mm) (kg) (kg) (MJ/100 m 2 ) . Cork 0.040 133 1,733.33 7.1 12,220 PUR/PIR 0.024 80 264.00 91.7 27,328 EPS 0.035 117 291.67 99.2 28,933 32 (165)
Nordisk Miljømerking Hus, leiligheter og barnehager 089/versjon 2 Høringssammenstilling, oppdatert 10. august 2010 Stone wool 0.038 127 1,520.00 22.1 33,622 Glass wool 0.037 123 1,295.00 34.6 44,807 XPS 0.036 120 420.00 110.2 46,284 Wood fibre 0.050 167 4,000.00 17.0 68,000 This overview does not take account of additional fixing devices and materials used for the building structure when heavy insulation products are used. Nordisk Miljømerkings kommentar We appreciate the examples from CPIF and BING illustrating the difficult balance between energy consumption of the building and use of materials with low environmental impact throughout their lifecycle. The Nordic Ecolabel is indeed aware that the main environmental impact is at the end-use, and therefore the energy performance of the building is the main requirement. The energy consumption of a house is however not only influenced by the thermal conductivity or weight of the insulating materials. Also parameters like thermal bridges and air tightness are important. The Nordic Ecolabel does, in order to achieve good thermal resistance and reduce the thickness of the façade have strict criteria for air tightness. The Nordic Ecolabel generally does not recommend specific technological solutions. O4 Lufttetthet Veidekke Norge Her bør dere benytte samme definisjoner som i TEK 07. Skanska Norge Kravet på lekkasje må oppgis i forhold til norske målemetoder, pr-NS 13829 – brukes volum ikke areal for å regne på luftlekkasje. Altså norske krav i forhold til volum må fremkomme. Kommende lavenergistandard bør legges til grunn. Det må spesifiseres om det skal måles på bygningskropp eller hver enkelt leilighet. Statens bygningstekniske etat (BE) Norge Kriteriet knyttet til lufttetthet bør uttrykkes som lekkasjetall med benevningen luftvekslinger pr. time ved 50 Pa, slik som i tekniske byggeforskrifter (TEK) og beregningsstandarden NS 3031. Boligprodusentenes Forening Norge Vi anbefaler på det sterkeste å uttrykke lekkasjetallet som ”norsk” lekkasjetall, dvs. luftvekslinger per time. Dette betyr at målte luftlekkasjer ved 50 Pa trykkforskjell deles på netto luftvolum, og ikke som ”svensk” lekkasjetall der luftlekkasjene deles på overflatearealet av klimaskjermen. Vi ser overhodet ingen grunn til å innrette kravet ihht. svensk beregningsmåte, all den tid det for flere andre Svanekrav relateres til nasjonale krav. Om Svanekravet til lekkasjetall uttrykkes på en annen måte enn det vi er vant med her i Norge, vil dette virke distanserende og være lite kommuniserbart i markedet. 33 (165)
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Småhus, flerbostadshus och förskolebyggnader - Svanen

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