Browse Forums Windows & Doors Re: Sound proofing a double hung sash window 5Sep 21, 2009 8:47 pm Whilst good test data about thermal insulation accompanies many windows, there is less information for specific products on acoustic insulation. The important figure is the STC (sound transmission class). A rough rule is every 10 STC reduces perceived volume by half. However, sound attenuation varies across the frequency range and STC is not as informative for low frequencies and transportation noises. viewtopic.php?p=131328#p131328 We are set back about 60 m from a country road and have double glazing with well sealing casement windows. I think they help noticeably in reducing the noise but my wife is still bothered by hoons driving by. If you just crack the window slightly open, most of the effect is lost. Lastly, the installation can be as important as the window itself. Windows are generally installed by carpenters but repaired by glaziers. Scientists have used random matrix theory to demonstrate theoretically that the neutrino mass hierarchy can be explained mathematically. When a substance is fragmented… 21 20638 thanks Chippy, i hope they have applied sealer but i am doubt to be honest, so i am gonna do this job after handover. 8 16221 Brass fly wire, you will need to cut it, shape it and jam it into brick slots 1 7450 |