These are basic issues that should be considered in all homes. There are additional design issues that can further improve the energy efficiency of the home. These are covered in another fact sheet called Advanced Framing Techniques. External channels usually go uninsulated. External channels usually go uninsulated.
Hard covers can be wood or drywall.
If necessary, employ raised-heel trusses or cantilevered trusses to achieve sufficient clearance. Identify recessed lighting as IC and air-tightness rated. HVAC system issues Show location of air handler on plans. Ensure sufficient clearance for return air ducts. Where air handler is in attic, provide clear path and sufficient space for downstairs return duct.