4.1104.2 Fiberglass Blown Insulation Installation (Lifting Siding)

Manufactured Housing Wall Insulation
Desired Outcome: 
Consistent thermal boundary Thermal boundary The separation between the interior and exterior environments of a building that slows heat flow and air barrier Air barrier The separation between the interior and exterior environments of a building that slows air flow to the point that no smoke movement is visible at 50 pascals of pressure difference across the boundary between the conditioned space and unconditioned space
Access wall cavities

If skirting overlaps siding, skirting will be removed

Fasteners will be removed from the bottom of the siding, working upward until the siding can be pulled away from the framing approximately 6" without damaging the siding

Temporary fasteners will be installed near the bottom of the siding panels at the seams

If a subsheathing is present under the siding, access through the subsheathing will be required

Gain access to the wall cavity without causing damage or separation of the siding

Exterior wall cavity inspection

Installer prework assessment will be conducted to determine:

  • Moisture damage
  • Presence of infestation or pests
  • Location and integrity of wiring
  • Holes to the interior and exterior
  • Loose paneling or siding
  • Location of belt rails
  • Location of wall obstructions (switches, outlets)
  • Existing insulation
  • Wall hangings for removal during work

Problems will be corrected before work begins

Prepare wall cavity for insulation

Prevent water leaks

Blowing machine set up

Blowing machine pressure test will be performed with air on full, feed off, and gate closed

Hose outlet pressure will be set according to manufacturer specifications

Achieve uniform insulation density and coverage

Fiberglass blown insulation installation

Insulation will meet a flame spread rating of 25 or less and a smoke development rating of 450 or less when tested in accordance with ASTM ASTM ASTM International, www.astm.org E84

Insulation will be installed to a density of 1.5 to-1.6 pounds per cubic foot

Using fill tube, 100% of each cavity will be filled to a consistent density

Special precaution will be taken not to overfill the bottom of the cavity

Fill tube will be inserted from the bottom of the wall cavity within 6" of the top of the cavity between the interior paneling and any existing insulation

Fire safety maintained

Fill entire wall cavity to the prescribed R-value to reduce air infiltration Infiltration The uncontrolled passage of outside air into a building through unintended leaks in the building envelope

Ensure bottom portion of siding will reattach properly

Avoid clogging of the cavity and the fill tube

Subsheathing patch and repair

Subsheathing will be patched or repaired as necessary

Ensure the integrity of the drainage plane


If skirting was removed, skirting will be reinstalled to shed water to the outside of the skirting

Siding will be reattached with new fasteners

Siding will be reattached without bulges or wrinkles

Ensure the integrity of the drainage plane

Reattach siding without damage

Onsite documentation
A dated receipt signed by the installer will be provided that includes:
  • Coverage area
  • Thickness
  • R-value

Document job completion to contract specifications

Confirm amount of insulation installed Comply with 16 CFR 460.17