Communicating Doors

Create your own communicating assembly with any door combo from our retail site at

We have tested each of our IsoDoor models in various communicating door assemblies. The results of these tests can be found in the Sound Tests section of our site. More information and tips on what we discovered through our testing can be found below.

Communicating Assembly Performance Videos

This video was sent in from a customer that built their own professional recording studio. The live room has 104 dB of sound on the other side of a IsoDoor HD LF and IsoDoor SD communicating assembly.

Communicating Door Facts

We have learned quite a bit about communicating doors through our extensive testing of these assemblies. Here are a few quick facts about communicating doors:

  1. The most cost effective way to reach 50 + STC ratings is in a communicating assembly. An individual door would have to weigh over 450 pounds and have massive concrete filled steel jambs to achieve an STC rating above 50. These types of doors are significantly more expensive and difficult to install. Which far exceeds the cost for materials and labor over buying two IsoDoor SD.
  2. The only reasonable way to achieve an OITC rating of 50 or higher is in a communicating door assembly. This OITC 50 + rating for the communicating door assembly is in line with double stud wall or GenieClip wall performance.
  3. Every 6″ added to the space between the two doors will add between 1-3 points to both the STC and OITC rating. The lower the mass of either door, the more the improvement over distance.
  4. Transmission loss will improve evenly in all frequencies when you increase the distance between doors.
  5. Increased distance between doors will increase air pressure considerably when both doors are closed. To alleviate this pressure we recommend leaving a 1/4″-1/2″ space between the two door jambs. This 1/2″ space should be open entirely to the inside of the wall for the air pressure to enter the wall cavity when the doors are closed. All of our communicating door tests were completed with this gap in place.
  6. The minimum wall thickness for two 1-3/4″ doors is 6-1/2″. The minimum wall thickness for one 1-3/4″ door and one 2-1/2″ door is 7-1/4″. The minimum wall thickness for two 2-1/2″ doors is 8″.