Double Glazing and Acoustic Glass

[Mr Bump]

One for the experts here and I know we have a few DG fitters on this site.
We live on a road which over the last few years has got busier, we have reaonable double glazing mainly 4mm-20gap-4mm standard stuff so 28mm panes.

We want to improve the noise reduction levels a bit and after looking bout it seems replacing the panes with accoustic glass ones will give a big result.

We have engaged a locla chap who is really good and has gone out and consulted local glass companies and has come back with a few suggestions.

one is a 10mm standard glass and a 6.4 Accoustic glass which will fit into a 28mm panel.

however at slightly more money (not much) he has suggested both glas panes be accoustic glass of different thickness. 1x 8.8 Accoustic and 1x6.4 Accoustic which can also be made into 28mm panels.

evidence on the web does say this type of combo is a big win.

any thoughts?

 

[Mr Bump]

According to this chart the bottom value which is similar to what we would be using just 2mm thinner does give the overall best result.

 

[Mr Bump]

anyone?

 

[bass_junkie83]

As a general rule, varying glass thicknesses helps with acoustic reductions.

Can you confirm the notation you are using for specifying the glass build up?

1x 8.8 Accoustic and 1x6.4 Accoustic = 8mm+acoustic interlayer+8mm + cavity + 6mm+acoustic interlayer+4mm ?

 

[Mr Bump]

the make up of the panel will be 1x sheet of 8.8 Accoustic and 1x sheet of 6.4 Accoustic and the gap is the difference between those and 28mm so just shy of 13mm.

Not sure what else you need info wise.
It is about making a 28mm panel as good as cost can do.

i think you are talking of sheets?
the 6.4 is 3mm/.4mm/3mm with the .4 being the laminate sandwich.

the 8.8 is similar with 4/.8/4

 

[andyred]

Can't help you directly with your double glazing, but I've an acoustic windscreen in my car and it does make a difference - the first time I really noticed any different was driving in the rain - the rain hitting the windscreen is much quieter...quite strange really

It's a bit difficult for you to heck as your only replacing the glass element, but if you can, make sure any gaps between the frames / house are sealed and foam filled, otherwise sound will pass through easily and undo all your work with the glass...