Browse Forums Windows & Doors Re: is 6.38mm laminated glass thick enough for a main road?? 2May 10, 2009 3:49 pm It may be-depends, are you a light sleeper? There is a product avaliable from Viridian Glass, its called V-lam Hush. Its a 6.5mm laminate. It is much more effective in reducing noise than the traditional 6.38. What type of frame are you using? Re: is 6.38mm laminated glass thick enough for a main road?? 4May 10, 2009 5:18 pm These days with the average weight of Australians increasing, main roads should be at least 7mm glass. Hahahahahahah! Sorry I couldn't help myself Pix Built a (highly) modified Allcastle Maxworth 38.7 in Sydney. Re: is 6.38mm laminated glass thick enough for a main road?? 5May 10, 2009 5:33 pm From a windows makers web site. The STC (Sound Tranmission Class) performance of a sample range of glass. Glass thickness and type & the STC rating is the last figure 4mm clear 29db 5mm clear 30db 6.38mm laminate 30db 7.52mm laminate 35db 10.38mm laminate 36db IGU 3mm clear/8mm air/4mm clear 28db Secondary window 6mm clear/100mm space/4mm clear 46db So you can see the best option is to double glaze with different thickenesses of glass and to also to seperate it by around 100mm. and whats a db? Sound – the basics The STC rating is measured in decibels (dB) and reflects the amount of noise that is reduced when it passes through the window. So if the noise outside is 70dB and inside it is 40dB, the window is said to have an STC rating of 30. Normally the human ear cannot detect a 1-2dB change in sound. However a 10dB decrease in the sound is subjectively heard by the human ear as a halving of the sound – eg a 40dB noise seems half as loud as a 50dB noise. The average spoken conversation makes a 50dB noise, while common street traffic and neighbourhood sounds make about 70dB noise. Re: is 6.38mm laminated glass thick enough for a main road?? 6May 11, 2009 1:39 pm Dear hmmmmm,
Noise reduction is not just an issue of the right glazing. The facts mentioned about the different glazing options is correct – talking about a bedroom next to busy road means that 6.38 are probably not enough. As double glazed window manufacturer I would recommend double glazing with an off set thickness of the panes as well as the air gap. Keeping the thicknesses the same means that noise of a certain wave length goes through straight away. The double glazing also gives you the convenient thermal advantage that you should look at. The special noise reducing glass is suitable and a unit of 8.5mm/12mm air gap/4mm should be alright. But it’s really up to the point where you have to measure the dB you will have to cut out to define the unit. Furthermore it is crucial to get a system that is well sealed. Air Infiltration is one of the worst problems whenever we get contacted in regard to noise. I was recently at a place that installed 10.38 laminated glasses in the double- hung windows to cut out noise. The problem wasn’t resolved due to the air infiltration. Sliding windows and doors are usually worst performing than hinged options. If you are looking at full replacement you should look at hinged option with compressible seals and multi-point locking to guarantee a tight seal. And installation requires caulking the gaps in between the frame and the wall. Leaving gaps (and that can be exhaust pipes, ceiling/wall joint or air conditioning fans) always means inviting a noise problem.
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