headers with insulation

[jail]

If the tables call for 2-2x8 header, do they need to be nailed together, or can I space them with foam insulation to match the depth of my 2x6 wall?

 

[SDS]

If the tables call for 2-2x8 header, do they need to be nailed together, or can I space them with foam insulation to match the depth of my 2x6 wall?

They need to be nailed as one member...insulation to the warm side. You can add a layer of 1/2" osb or plywood between to make up the difference in thickness though.

 

[jail]

Is there any information in the code that states this?

 

[SDS]

Is there any information in the code that states this?

Table R602.3(1) fastening schedule, item #10

CHAPTER 6 WALL CONSTRUCTION - 2015 INTERNATIONAL RESIDENTIAL CODE (IRC)

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There is provision in the code for a 'box header' that is similar to your question but the construction is not the same.