Reducing noise with double glazing

[Possom]

If wanting to reduce the amount of traffic noise penetrating through my windows I am aware of two options.

a) 6mm sheet of glass as the external sheet of double glazing, and a 4mm sheet of glass as the internal sheet.

b) glaze relevant windows with Pilkington Optilam Phon
http://www.astrasealdownloads.com/files/optilamphon.pdf


Perhaps option a) would reduce the thermal efficiency?

I have heard that if generally using laminate glass (though not in relation to the brand mentioned) that laminate glass can perhaps produce its own resonance and therefore in effect produce its own noise.

Any comments would be most welcome as to these two options? Thanks!

 

[foxhole]

triple glazing?

 

[Possom]

triple glazing?

Triple isn't as effective as the two options above at reducing noise.

 

[Gazman16]

If you look into the db reduction of specialist acoustic double glazed units it only reduces noise by the equivalent of a whisper or leaves blowing in a tree, Plus they are silly expensive.

Best bang for your buck is to fit secondary glazing with a 100mm gap between it and your window.

Before you do that though have a look at the any trims around your windows, Pull one off and see how big the gaps are to the walls and if the fitters have used expanding foam. It may be a case of you having big gaps around your windows that are just covered with 6mm of pvc trim.

 

[Possom]

Before you do that though have a look at the any trims around your windows, Pull one off and see how big the gaps are to the walls and if the fitters have used expanding foam. It may be a case of you having big gaps around your windows that are just covered with 6mm of pvc trim.

I haven't had the double glazing fitted as yet. Was wondering about this before I get any fitted, so I get the correct glass fitted from the start.

 

[Gazman16]

Ah ok.

Well as I said the acoustic glazing is very expensive and in my opinion will not make a noticeable difference. Triple glazing can make things worse from what I have read due to the reduced air gaps in the units.

I would say save the money on the fancy extras for now and make sure whichever company does the fitting will be foaming around the windows (don't just trust the salesman, Get it in writing).

The money you save on the expensive parts can be put towards secondary glazing or some nice thick curtains if you feel like you need more soundproofing later on.