Soundproof a wall connected to a window?

[272man]

This commercial space I recently took over, the building sits on a fairly busy street, so traffic, delivery vans, and the occasional late night chatter, it’s like the wall has turned into an amplifier and its really disturbing for me. The window itself is solid, double glazed and in decent shape but the surrounding wall seems to be letting a lot of sound come through. I’m looking for a solution that improves the soundproofing without completely tearing everything apart, since this is a commercial building and I don’t want to cause too much disruption.
What options can I explore ?

 

[Iamshirl]

Mass loaded vinyl might be your friend here, you can hang it like thick wallpaper without major demo. Also check gaps around the window frame that just need acoustic caulking, is the noise mainly low frequency like traffic rumble or higher pitch stuff?

 

[NavyBlaq]

This commercial space I recently took over, the building sits on a fairly busy street, so traffic, delivery vans, and the occasional late night chatter, it’s like the wall has turned into an amplifier and its really disturbing for me. The window itself is solid, double glazed and in decent shape but the surrounding wall seems to be letting a lot of sound come through. I’m looking for a solution that improves the soundproofing without completely tearing everything apart, since this is a commercial building and I don’t want to cause too much disruption.
What options can I explore ?

Have you identified exactly where the sound is coming through? might not necessarily be the wall itself but gaps around the window frame or penetrations

 

[Alan]

@272man biggest gains are usually at the weak point. Seal gaps around the window first, then think about adding mass to the wall. Even a layer of MLV or a secondary drywall can help without ripping anything apart.

 

[Jackson]

Start by sealing all gaps around the window frame with acoustic caulk, as even small cracks let a lot of sound through. Then, you can add mass to the wall. Options like mass loaded vinyl (MLV) or a second layer of drywall can make a noticeable difference without major demolition. Focus on these weak points first for the most effective improvement.

 

[Vertesol Eustache]

This commercial space I recently took over, the building sits on a fairly busy street, so traffic, delivery vans, and the occasional late night chatter, it’s like the wall has turned into an amplifier and its really disturbing for me. The window itself is solid, double glazed and in decent shape but the surrounding wall seems to be letting a lot of sound come through. I’m looking for a solution that improves the soundproofing without completely tearing everything apart, since this is a commercial building and I don’t want to cause too much disruption.
What options can I explore ?

Sure, I would definitely consider the risks associated with the double vapor barrier in your climate. Having tape'd polyiso below the ceiling that's currently topped with poly could result in moisture being captured between the two barriers.

Personally, I'd either take down and slit the poly above, or I wouldn't completely tape off the foam layer.