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I assume this wood framing is the wall stud.

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My room looks like as follow with concrete walls

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In order to soundproof external noise into my room (red circle), do I need to build wall stud?

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  • $\begingroup$ what are you soundproofing from? external noise? noise into that small room? Common sense practice is to fill that stud wall with insulation just in case. $\endgroup$ – Solar Mike Jan 28 '20 at 9:13
  • $\begingroup$ What level of sound-proofing do you require? From what sort of external noise, at what sound level? $\endgroup$ – 410 gone Jan 29 '20 at 6:24
  • $\begingroup$ @EnergyNumbers Does level of sound-proofingmean STC rating? $\endgroup$ – zghqh Jan 29 '20 at 6:47
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The way I have seen it is to use 2 X 6 on each end and floor and ceiling of the wall then build two separate walls with 2 X 4. Stagger the 2 X 4 in the walls so the only solid contact for sound conduction are the 2 X 6 ends. Fill the space ( now 5.5" instead of 3.5" ) with insulation. The result is little solid contact ( at the ends) for conduction and a thicker sound absorbing insulation. I was describing a partition wall , but essentially you could put the same thing against a concrete wall ; The important factor , you don't want 2 X 4 touching both wall surfaces as they would conduct sound.

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  • $\begingroup$ Thanks for your answer. In your solution, which part is close to the concrete wall, the stud or something else, if the latter, then what is that? $\endgroup$ – zghqh Jan 29 '20 at 6:51
  • $\begingroup$ The 2 X 6 one the ends and floor touch both walls but the 2 X 4 do not. $\endgroup$ – blacksmith37 Jan 30 '20 at 15:15

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