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I think you can update the EnergyPlus idd file to expand the Construction object to include more layers:

...
       \object-list MaterialName
  A10, \field Layer 9
       \type object-list
       \object-list MaterialName
  A11; \field Layer 10
       \type object-list
       \object-list MaterialName

Becomes

...
       \object-list MaterialName
  A10, \field Layer 9
       \type object-list
       \object-list MaterialName
  A11, \field Layer 10
       \type object-list
       \object-list MaterialName
  A12; \field Layer 11
       \type object-list
       \object-list MaterialName

Alternatively, you could combine materials prior to defining them in EnergyPlus.

I think you can update the EnergyPlus idd file to expand the Construction object to include more layers:

...
       \object-list MaterialName
  A10, \field Layer 9
       \type object-list
       \object-list MaterialName
  A11; \field Layer 10
       \type object-list
       \object-list MaterialName

Becomes

...
       \object-list MaterialName
  A10, \field Layer 9
       \type object-list
       \object-list MaterialName
  A11, \field Layer 10
       \type object-list
       \object-list MaterialName
  A12; \field Layer 11
       \type object-list
       \object-list MaterialName

Alternatively, you could combine materials layers/materials prior to defining them in EnergyPlus.

Edit: guess my first answer won't work. Other ting I can recommend is combing layers, a fairly straight forward process for continuous layers (i.e. when you don have to account for thermal bridging)

I think you can update the EnergyPlus idd file to expand the Construction object to include more layers:

...
       \object-list MaterialName
  A10, \field Layer 9
       \type object-list
       \object-list MaterialName
  A11; \field Layer 10
       \type object-list
       \object-list MaterialName

Becomes

...
       \object-list MaterialName
  A10, \field Layer 9
       \type object-list
       \object-list MaterialName
  A11, \field Layer 10
       \type object-list
       \object-list MaterialName
  A12; \field Layer 11
       \type object-list
       \object-list MaterialName

Alternatively, you could combine layers/materials prior to defining them in EnergyPlus.

Edit: guess my first answer won't work. Other ting thing I can recommend is combing combining layers, a fairly straight forward process for continuous layers (i.e. when you don have to account for thermal bridging)bridging), lots of info online on how to do it for discontinuous layers as well.

I think you can update the EnergyPlus idd file to expand the Construction object to include more layers:

...
       \object-list MaterialName
  A10, \field Layer 9
       \type object-list
       \object-list MaterialName
  A11; \field Layer 10
       \type object-list
       \object-list MaterialName

Becomes

...
       \object-list MaterialName
  A10, \field Layer 9
       \type object-list
       \object-list MaterialName
  A11, \field Layer 10
       \type object-list
       \object-list MaterialName
  A12; \field Layer 11
       \type object-list
       \object-list MaterialName

Alternatively, you could combine layers/materials prior to defining them in EnergyPlus.