1. Prep area

• Clear work area of any debris or clutter.

2. Air seal

• Follow work order guidance on air sealing area before insulating.

• For other reference see sections listed below:

• Air Seal Floor Above Unconditioned Space

• Air Seal Knee Wall

• Air seal Basement or Crawl Walls

3. Install batts

• Install unfaced batts so the sides are touching the framing and interior surface.

• Make sure not to compress the insulation.

4. Cut batts to fit

• Cut batts to fit neatly around pipes and outlets so it is not compressed.

5. Split batts around wiring

• Split batt around wiring  to prevent compressing the insulation.

6. Secure batts

• Secure batt by one of the following methods:

  • Install wood lath to joist approximately 12 inches apart for joist 24 inches on center and 18 inches apart for joist 16 inches on center;

  • Or secure by installing non-stretching polypropylene or polyester twine in a zig-zag pattern. Use power driven staples12 inches apart for joist 24 inches on center and 18 inches apart for joist 16 inches on center. 

7. Align batt with air barrier

• If batt size does not fill the entire cavity it needs to be securely installed against the surface being used as the air barrier.

8. Install insulation certificate

• A dated insulation certificate signed by the installer will be posted on a wall in the space where the furnace is located, a utility room or an approved location inside the building.

• Certificate shall include:

  • Installed insulation type

  • Coverage area

  • Installed thickness

  • Installed R-value

  • Manufacturer product name

  • Manufacturer supplied material density

9. Faced batts

• As a best practice we recommend not using faced batts.

• If faced batts must be installed, the facing should be installed toward the conditioned side of the envelope.

10. Exposed batts

• Batts exposed to interior living space must be:

  • Covered with minimum half inch drywall or other material that has a ASTM flame spread rating of 25 or less;

  • OR  covered with an air barrier such as house wrap to prevent R-value degradation by convection and to prevent occupants from being exposed to insulation fibers.