So, if a website says that thick acoustic glass can reduce by 42 dB is this what they mean?
That 110 dB will, inside the glass, be 68 dB?
So, for example, if my balcony gets 110 dB, then turning it into a glassed in conservatory will give me some 70 dB inside the conservatory?
Which will, given the next layer of the doors into the living room from the balcony, reduce down again to 50 to 60 in that living room? I’ve just checked, those doors do give a 10 to 15 reduction.
Have I got the way these measurements work right?