The new regulations on energy efficiency in buildings (D.lgs. 192/2005, becoming D.lgs. 311/2006) are prompted by European Directive 2002/91 and introduce new legislation affecting the design of new buildings as well as extraordinary maintenance operations on façades.
In particular the regulations prescribe extremely low levels of thermal U transmittance via walls and greatly reduce the maximum allowed PER (Primary Energy Requirement) in building.
Decree 311 also introduces a series of norms to ensure residential wellbeing: absence of interstitial condensation, correctives to “thermal bridges” (maximum dispersion 15% more than the wall), surface mass values (weight of matt vertical wall >230 Kg/m2), periodic thermal transmittance Yie<0,12 W/m2K (a value measuring performance in relation to summertime comfort).
Swathing existing or new buildings in an insulating outer sheath is a simple, economical, effective way of complying with these laws. TermoK8 - an Ivas line these thirty years and more - includes a broad gamut of cladding insulation affording answers to the various requirements of the designer, architect or constructor.
When applied to an existing wall, TermoK8 upgrades the energy profile of the building and gives high thermal performance in summer and winter. Take a double skin of perforated brick (8 + 12 cm) with a 5 cm air cavity in between: upgraded by classic TermoK8® (EPS cm 8), the winter transmittance of the wall is improved nearly four times over, while the thermal bridge transmittance improvement is nearly ninefold: the inside wall behind the thermal bridge becomes much warmer, condensation finds it harder to form, so mould can’t proliferate. By contrast, in summer TermoK8® improves the attenuation factor (af) threefold, and also increases the displacement value by 45%.
In gauging the system’s physical, mechanical and performance characteristics, everything hinges on choosing the kind of insulating material, the thickness of which will depend on the ? thermal conductivity of the material. Thermal U transmittance being equal, the thickness of the insulation will vary and, with it, the total thickness of the new or upgraded wall.
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