Noise insulation (1 Viewer)

[cts_casemod]

Hi guys,

Question not directly related to home theater but to sound insulation, so assumed I could use some expert advise here.

I live near a busy road. The bedroom has a large 1.40*2.75m window which I'm planing to cover with an acoustic material such as Rockwool prorox.

I am given a choice of masses. Prorox 920, for example has a mass of 45KG/m3 with a semi rigid feel. Prorox 960 is a denser material at 100KG/m3 and harder shape, which also comes handy as it fits close to the window frame without the need of fixing materials (panels be easily removed as needed).

Would it be a wiser solution to simply chose the one with the larger (both will be 10mm thick) mass or are there any factors I should be aware of? Maybe a mixture of 50mm 920 (softer) and 960 on the back?

Just to clarify the idea is to block as much noise as possible from the outside environment. I'm not worried about internal noise reflection.

Many thanks

 

[DaveF]

From my recent reading and conversations, you'd be well served by:
Put in layer of R19 pink insulation.
Install double-layer of 5/8" drywall, glued together with Green Glue and fit into the space (not compressing the insulation).

Basically, air gap plus mass gives sound mitigation. Insulation by itself is the least effective solution, and the more rigid the insulation, the worse for sound mitigation.