Our acoustic sash windows go up to 47dB in our Ultra range - that’s the best you’ll find on the market. Our Soundproof and Soundproof+ ranges go up to 40dB and 43dB respectively. But it’s not just our windows that stop sound coming in.Our installation process has been finely tweaked to ensure the best possible results. From using acoustic sealants and tapes, to isolating the window from the wall, our expert installers have been highly trained to prevent any air gaps that sound could get through.It is important to note that your windows will only be as effective as your property itself. If you have noisy air vents, chimneys or other entry points for sound, you will still suffer from noise pollution.