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The thermal insulation of perimeter walls using an “external” technology has been a solution in use for many years, which has recently undergone significant development due to the introduction of strict legal provisions aimed at limiting energy consumption. The need to reduce energy consumption for heating and cooling residential buildings requires the design of buildings in accordance with actual energy efficiency and the establishment of energy “classification” of buildings according to the determination of value classes, e.g. A, B, C, D, E, F, G.
Buildings constructed in the 1990s, which lack efficient thermal insulation, have the highest consumption and are classified in classes F and G. Buildings classified as A or B have very low consumption due to insulation measures taken to achieve excellent insulation of the entire building. Low energy buildings represent a secure economic investment for the future. The criteria for defining the building value class relate to the values of thermal transmittance of the main constructions. Since low transmittance values (good insulation) correspond to low consumption, well-insulated vertical and horizontal constructions will guarantee strong savings on gas and electricity bills.
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Table of values of the classification of energy efficiency buildings according to annual energy needs for heating and cooling in kWh/m2
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A+
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A+ grade
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Passive-active facilities insulated with the highest quality insulation over 25 cm thick, use heat recovery systems and renewable energy sources
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Under 15
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A
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A grade
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Buildings insulated with thermal insulation over 10 cm thick, low-energy, excellent PVC joinery and use renewable energy sources
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Under 45
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B
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B grade
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Well-insulated buildings protected by neighboring buildings
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Under 95
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C
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C grade
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Well-insulated buildings and newer apartments
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Under 135
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D
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D grade
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Houses insulated from all sides, with PVC joinery, well-insulated apartments
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Under 180
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E
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E grade
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Facilities with minimal insulation
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Under 225
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F
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F grade
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Older buildings without insulation
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Under 270
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G
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G grade
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Older buildings without facades and old joinery
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Under 270
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