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The Decibel Scale
Gives an approx of human perception of loudness. This is because the human ear has a logarithmic response to changes in sound level...more

Sound Insulation
Two parameters describe sound insulation; Dw and Rw. Dw is the insulation between rooms. Rw is the lab-tested insulation of a wall/floor...more
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Code for Sustainable Homes Daylight Calculations can also be known as:
Code for Sustainable Homes, CSH, C4SH, Code Assessment, Sustainable Homes, Code for Sustainable Homes Daylight Calculation,
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