Using selected examples of residential buildings (different compositions of the building evelopes), we carried out a combination of measurements and calculations of the actual sound insulation values of the external separating elements. We dealt with the impact of traffic, the heat pump and the noise from the church bells. We compared the results of the measurements of the internal noise levels in protected building areas with the requirements and recommendations. We calculated the sound insulation of the facade using an equation and a software, and identified possible deviations from the requirements and recommendations. We have based the calculation, measurements and evaluation of compliance on the stringent limit values, as the requirements are not fully consistent with each other. The results of the measured values of external noise level for different noise sources (LAFeq) and the comparison with limit values indicated that the noise from the church bells (87.6 dB (A)) and the heat pump (59.9 dB (A)) exceeded the limit value of 55 dB(A), while the traffic noise (52.1 dB (A)) didn’t. The results of measured indoor noise level (LAFeq) for the different noise sources and the comparison with the limit values showed that in the case of church bell noise (53.6 dB (A)) the limit value (35 dB (A)) is exceeded, in the case of heat pump noise (26.5 dB (A)) limit value (30 dB (A)) is not exceeded, while traffic noise (44,0 dB (A)) exceeds the limit value (30 dB (A)) (early morning time). We determined the sound insulation of an old stone house in two ways. Firstly, we considered the noise of the bells and used an equation to calculate an isolation of 34.10 dB (A), which does not meet the equation’s limit of 57.63 dB (A). The second time, in another room of the same house, we used loudspeaker noise (90 dB(A)) to determine an insulating power of 34.63 dB (A), which does not meet the limit value given by the equation of 57.63 dB (A). In the case of a house, where we measured the heat pump noise, the sound insulation (30.83 dB (A)) determined by the equation meets the limit value (27.33 dB (A)). In the case of a house located on a bypass road, the insulation (37.97 dB (A)) determined by the equation and the loudspeaker (90 dB(A)) does not meet the limit value (63.97 dB (A)). The partition wall insulation in a semi-detached house (51.32 dB (A)), determined by the equation, does not meet the limit value (55.00 dB (A)). In terms of comprehensive prevention and control of noise exposure in the built environment, legislative requirements should be coordinated and the most stringent noise limit values should be used as a basis for calculations, measurements and assessment of adequacy.
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