Browse Forums Windows & Doors 1 Apr 23, 2019 7:34 pm Has anyone here experience of ordering double glazing? We were given a plethora of variations of glass widths, space widths, this coating and that coating to provide an estimated reduction in Rw, obviously the more reduction in Rw the higher the cost. My question is around the validation of these estimated reductions in Rw. I intend on hiring a sound meter once the build is completed and we move in, what recourse do I have if the reductions in RW aren't as much as claimed? Anticipating the manufacturers response that it was 'an estimated reduction', would we be able to claim the difference in the measured reduction of Rw against one of their cheaper products? For example, if we opted for the product at $2k for Rw30 and they had a product at $1k for Rw20, the measurement came back as Rw20, would I be able to claim the $1k difference? Or do I ask the manufacturers to make another set, this scenario is highly unlikely as they won't want to wear additional cost and/or have returned windows around in the workshop which no one else wants. Thoughts anyone? Thanks Re: Double-Glazing 2Apr 23, 2019 9:05 pm It will be impossible for you to measure the noise reduction levels in the whole range of frequencies as they are doing in the sound lab setting in order to calculate Rw value. I would rather rely on the official testing reports. The best windows I have seen for sound reduction were tripple glazed Internorm stacker doors where I literally couldn't hear a sound from the other person shouting out loud at me from the inside of the closed door just half a meter away from me. Those ones had Rw of 37. Re: Double-Glazing 3Apr 23, 2019 10:16 pm Even with a sound meter? The glazer has estimated better than Rw35 but less than Rw40 for our windows, how would I be able to trust that this estimate is true? Should I ask for an official test report? Re: Double-Glazing 4Apr 23, 2019 11:58 pm Sound meter can only measure (in certain frequencies). In order to calculate actual Rw, you would need also a way to produce noise in a wide range of frequencies in a controlled manner. Yes, they should be having official lab test reports. Re: Double-Glazing 5Apr 24, 2019 7:03 pm Thanks alexp79, I will be asking for official lab test results. Obvious question is, what happens when they say they don't have any?? Sorry mods, didn't realise there was an existing Double Glazing thread viewtopic.php?f=23&t=93928 feel free to merge Re: Double-Glazing 6Apr 26, 2019 10:58 am Our windows are all laboratory tested... our standard double glazed window achieves Rw 35 and this can be upgraded to Rw 39. These have been placed in projects with acoustic engineers reports which specify the likes of 12.38mm & 10.38mm glass, and have been measured in situ by the engineers and achieve the test results. Glass is part of the solution, well designed, well-sealed windows are the other part. Without a test certificate, you really don't know what the result will be. BTW our standard aluminium window is also the most energy efficient aluminium window in Australia... and carries a wind rating of N4 for an awning window, 2400 x 2400... My guess is we will be 30% cheaper than any equivalent window. "ECOECO" At 'EcoEco', we design windows, we design the best windows, we do it for you, so that when you’re happy we are happy. Tel. 1800 326 326 This is one of the reasons I decided to go overseas for my double glazed windows. As the builder indicated, he's worked on many upmarket builds, these were the most well… 13 19082 For your reference Performance Labels: Window assemblies in housing, except timber windows, must be labelled so the label can be seen when it is in situ. For timber… 6 7684 I’m in a similar position except I’m after sliding 3 stacking doors. I am on a second-story apartment of which the balcony would not adequately fit any bi-fold or… 5 16127 |