Reply To: 2 story duplex


Robert Minor

Thanks for the information regarding not needing to put in an insulation value for the floor under the upper duplex. Thinking on it it’s a good idea not to put in a specific R- value because the floor between the two units has to be a 1 hour fire type and it also has to have a STC 50 rating as well as an IIC 50 rating (impact sound).  This assembly also usually is required to be a listed assembly and a lot of listed assemblies are very specific as to what they will allow, calling out R-19 might make an assembly unusable for plan check.

I just ran it with R-0 for the insulation for the floor over the lower unit and it calced the same, thanks again for the good advice.

Take care,