ᐅ Replacing or upgrading the front door panel for improved sound insulation

Dear forum,

We moved into our house in April, and you have always supported us. Now I need to take action again and would appreciate your feedback. :-) We have a stylish front door, but we occasionally hear cars passing by from the street. The house is located about 30 meters (98 feet) from the road, which is a village street. No cars pass by in the evening, but there are some during the day. Is there a way to add sound insulation to the inside of the front door afterwards? It is completely airtight. The noise penetrates through the door leaf.

Here are some ideas I have considered:

• Double boarding with Knauf Silentboard, then plastering. Attach using Beko construction adhesive without drilling.
• Bond 10 mm (0.4 inch) laminated safety glass with PVB film in glossy white.
• Carpenter option with mineral wool and a new inner frame applied on top. We know him well, and he’s enthusiastic about trying this experiment.
• Contact door manufacturer for a new inner panel… this is probably the most extensive option.

Attached is a photo. The window next to it is triple-glazed (SSK 4). Nothing gets through there except when a truck drives past on occasion. What do you think? Many thanks in advance. I love this forum. :-)

Bauherr&-frau schrieb:

What do you think?

Honestly? The effort involved in adding extra measures to an existing door (which might not even be feasible), with only occasional traffic during the day on a street 30m (100 feet) away: effort versus benefit? I’d rather save that money and, in the post-Covid era, have a nice meal out with the builder. That would make me happier. As Confucius said: There is always some noise.

This is a diplomatic response that also brought a smile to my wife’s eyes! Thank you. :-) Now, purely theoretically speaking: would the option with the Knauf boards work?

I can't really contribute much from a technical standpoint. However, with our doors and windows, it turns out that most of the sound passes through the junctions and edges. From my perspective, adding a panel to the door leaf would not achieve the desired result. Aside from whether it can actually look "nice" aesthetically.

You actually need something soft or damping, yet heavy (bitumen sheets, for example). These would prevent the thin filling from "resonating." So something from speaker construction ;-) but more aesthetically pleasing. I wonder if mineral wool plus panels would be enough? Even though mineral wool is supposed to help acoustically separate rooms in timber frame construction... I’d take the risk ;-)
Visually, you don’t have much to lose :p

Is the panel covering the outer edge of the frame, or is that why you are considering adding an additional layer rather than replacing the panel?

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