1. Verify that installation area is free of: 

• Active water leaks, fuel leaks (i.e., gas, oil, propane), and pest intrusions

• Uncovered electrical junctions

• Improperly terminated devices (ventilation fans, dryers, plumbing stacks, condensate lines, combustion appliance flues/chimneys, etc.)

• Unshielded high-temperature devices (non-IC rated recessed lights, chimneys, flues, vents, etc.) unless they are zero clearance devices

• Insulation escape openings

Verify that installation area is:

• Intact and able to support insulation weight

• Air and duct sealing is complete

• Verify that all plumbing is within the thermal boundary, or insulated appropriately

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2. Verify that installation area is:

• Intact and able to support insulation weight

• Air and duct sealing is complete

• Verify that all plumbing is within the thermal boundary, or insulated appropriately

3. Belly repair 

• Choose appropriate option from steps 3a - 3b to patch mobile home belly 

3a. Belly repair: small 

• To patch a flexible belly, use both adhesives and stitch staples to bind the flexible patch to the flexible belly material. 

• In weaker areas of the belly screw wood lath to the framing to reinforce belly material. 

3b. Belly repair: large 

• Use belly fabric or house wrap to cover damaged area. Creating a "new" belly.

•  Secure edges of fabric by rolling a 1x2 into the edges and securing the 1x2 to framing members of trailer with appropriate fasteners.

•  Tape any seams with manufacturer approved tape AFTER properly preparing surface to ensure adhesion. 

4. Install insulation

•  There are two methods for installing loose fill fiberglass insulation in a mobile home belly 

• Blow in fiberglass through belly material; steps 5-5a

• Blow in fiberglass through rim; steps 6 - 6e.

• Pick the most appropriate method for the job you are working on. 

5.  Blow in fiberglass through belly material 

• Loose fill fiberglass is the only material to be used in WAP

• Cut  a hole in the belly material just big enough to fit the insulation hose through it

• Using the insulation hose fill the cavity taking care not to over pressurize and cause a blowout  

5a. Patch access hole 

•  After insulating the belly patch the access hole  with both adhesives and stitch staples to bind the flexible patch to the flexible belly material. 

6. Blown in Fiberglass: through the rim  

• Loose fill fiberglass is the only material to be used in WAP

• Follow steps 5a-5e to install blown in fiberglass in the mobile home belly 

6a. Remove Skirting 

• Remove skirting to gain access to the rim joist. 

• Use caution older sun damaged skirting can become brittle. 

6b. Drill Hole 

• Drill hole big enough to fit fill tube. 

6c. Blow in Insulation 

• Fill cavity to manufacture specified density for the material being used. 

• Watch belly material and repairs for blow outs. 

• Best practice would be to go inside the home and verify ducts were not breached with insulation materials. 

6d. Plug the hole 

6e. Replace Skirting 

7. 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 WAP Worst Case Draft Test form. 

8. Install Insulation Certificate 

• A dated insulation certificate signed by the installer will be attached in the interior electrical panel or other approved location. 

• Certificate shall include: Insulation Type, Coverage Area, installed thickness and minimum settled thickness, Number of bags installed in accordance with manufacturer specifications