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Author Topic: Door Soundproofing Expectations  (Read 3522 times)


  • Guest
Door Soundproofing Expectations
« on: February 18, 2016, 04:02:10 AM »


I've been working on soundproofing a bedroom door. Problem sounds are: conversations and dinnerware noise, LOUD coughing, crying and yelling toddlers. Deep voices seem to be more of a problem than higher ones.

I installed a Roxul Safe N' Sound door (STC 27, looks like this: along with weather stripping around the header and jamb and an automatic door seal. It was defnitely an improvement over the previous hollow-core door, but not sufficient for me.

So I've decided to improve the door by:

1. Adding a 1/2 inch piece of drywall to both sides of the wall above the door and the small area to the sides of the door with Green Glue in between + foam filler and fiberglass insulation.

2. Adding a 1/2 inch of dry wall to the side of the door facing the bedroom with Green Glue in between.

3. Adding gaskets to the header and jamb, something like this:

4. Adding this sound barrier to the door:
It's essentially a sheet of MLV sandwiched between two layers of fiberglass.

I've tried to include a good deal of mass and dampening. The finished door with everything added will weigh about 130 pounds.

I'm wondering how much improvement I could expect after doing these things, and particularly what sort of STC I could reasonably expect? Ideally I'd like 45+.

Any help would be appreciated, thanks!

Randy S

  • Guest
Re: Door Soundproofing Expectations
« Reply #1 on: March 05, 2016, 06:41:41 PM »

Sorry for the delay,

This will always fall under mass law, so doubling the weight of the door will yield 5 db drop.
Ideally you can increase the weight far cheaper then the door blanket you posted a link to simply by glue #2 lb mass loaded vinyl to the door.

After you have added as much weight as you can then you can add a foam panel for absorption to achieve a few more points.

As for a STC value 2" solid oak door at 177 lbs would hit about STC 45. field...due to the path around the door.

Randy S.