1. Remove insulation

• Remove or adjust existing insulation to allow access to knee wall framing.

2. Install roof rafter air barrier

• Install a tightly fit rigid air barrier to fill the entire opening between the roof rafters at the top of the knee wall.

3. Install outer ceiling joist air barrier

• Install a tightly fit rigid air barrier to fill the entire opening between the outer ceiling joists and the bottom of the knee wall.

4. Surface prep

• Sweep or vacuum all surfaces where sealants will be applied to remove dust and debris and allow for maximum adhesion.

5. Air seal

• Install a continuous Air seal around seams, joints, cracks, edges penetrations and connections to provide an airtight, durable seal that does not move, bend or sag.

• This should include connection between interior surface and framing, and any cracks in drywall or paneling.

6. Air seal tongue & groove paneling

• For knee walls with tongue & groove paneling, cut and fit tightly an air barrier such as wood or rigid foam between the framing members to establish an air barrier on the attic side of the paneling.

• Sealant should not be visible in the living space.

7. Air seal attic access

• Follow guidance in the Attic Access section of this field guide to air seal attic access in knee walls.

8. Reinstall insulation

• Follow the work order to either reinstall the old insulation, or install new insulation.

• Follow guidance for proper installation as outlined in the Insulation: Batts section, or Insulation: Dense Pack section as applicable.

9. Worst Case Draft test

• Conduct a Worst Case Draft Test to verify Category I, II and III appliances are venting safely before leaving home for the day.

• Testing shall be recorded using the Utah WAP Worst Case Draft Test from.