Cantilever Code Compliance Guide 

Kelly Kaminski

Coolman Communities

"Energy Diagnostics keeps us on our toes and ahead of the game! We began working with Energy Diagnostics in 2000, as they certified our new construction homes to the Energy-Star® program. In late 2008, it was a smooth transition to the NAHB Guidelines and then to the National Green Building Standard. Everything is handled with professionalism and integrity; from pre-scoring to scheduling to inspections and follow-through with NAHB. Ample notice is given when changes are happening to codes or standards. These guys are passionate about what they do, and they do it well."

Brad Wallace

Granite Ridge Builders

"Energy Diagnostics is the foremost authority on energy efficiency. They keep us in tune with the latest rebates and tax credits, and have shown use how to make a great house even better"

Justin Purdy

Vice President
Construction Lancia Homes

"Energy Diagnostics does a great job doing energy ratings on all of 180+ homes we build every year. Their knowledgeable staff guides our company in the right direction to make our homes more energy efficient and make our homes comfortable for our customers to live in for many years to come."


Good Examples

  • A good air barrier (Prevents unconditioned air from getting into house)
  • Foamed/Caulked (ANY seams that can allow cold air in)
  • Bay filled with fiberglass/spray foam (must be in contact with top & bottom of bay)
  • Under side of cantilever has foam board/air barrier (more sealing to prevent air from coming in)

Factory Seems, Connections, Penetrations, and Framing Members all need to be sealed

Step 1

Cantivelers - Step 1

Step 2

Cantivelers - Step 2

Step 3

Cantivelers - Step 3


Cantivelers - Diagram


NOT sealed,

no insulation

Cantivelers - Not Sealed

Vents/exhausts that are not vented to the outside

Cantivelers - Not Vented

Open bays, not enough insulation

Cantivelers - Not Enough Insulation

Could cause mold/rotting problems within cavity, etc.