Sashed has changed my life! My quality of sleep had been going down for months, due to many external noises on my formerly super quiet street: constant motorway hum in the background, drunken revellers at 2am, bin men at 5am, etc - Sashed eliminated them all. The decibel count in the bedroom was at 60db with the windows open, and down to 40db with the old windows closed. My bedroom is now at 25dB after installing 2 Sashed windows. This is undistinguishable from total silence ... amazing! I keep recommending this solution to friends, and I'm very happy to publicly endorse Sashed. Thank you for giving me my sleep back :-)