4.1104.1 Stuffing Wall Cavities with Fiberglass Batts

Topic:

Walls

Subtopic:

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

Manufactured Housing

Title	Specification(s)	Objective(s)
4.1104.1a Access wall cavities	If skirting overlaps siding, skirting will be detached to allow access to the wall cavity 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 to prevent separation If a subsheathing is present under the siding, access through the subsheathing will be required	Gain access to the wall cavity without damaging or separating the siding
4.1104.1b Exterior wall cavity inspection	Wall cavities will be inspected for moisture damage, pest locations, and integrity of the wiring, and holes to the interior Siding will be repaired as necessary Location of belt rails, obstructions, and existing insulation will be identified All interior surfaces of exterior walls will be inspected for loose paneling joints, occupant wall hangings, location of switches and outlets, and other wall obstructions Objects will be removed from the interior surfaces of the walls being insulated Interior paneling will be repaired as necessary	Prepare wall cavity for insulation Prevent water leaks from occurring
4.1104.1c Fiberglass batt installation tool (stuffer)	A sheet of polycarbonate, such as Lexan, will be cut to the following specifications to create a stuffer tool: Approximately 1' x 8' x ¼" with a 5 degree bend 7' ½" from the bottom All corners of the Lexan (polycarbonate) will be rounded and all edges will be sanded Other clear sheet plastics will not be used due to a tendency to shatter under stress	Create a tool to install a fiberglass batt into the cavity Ensure worker safety
4.1104.1d Fiberglass batt installation	Thickness of the batt will fill the void without deforming siding or damaging structure Fiberglass batts will fill the cavity (e.g., batt may be cut approximately 1" longer to ensure proper fill and allow for lap at the top) Flexible membrane will have an appropriate perm rating Perm rating The measurement of a material's ability to allow the transfer of water vapor through the material for the region Flexible membrane will be cut 2" wider than the cavity and approximately 1' longer than the batt Stuffer tool, membrane, and fiberglass batt will be aligned for installation Stuffer tool will be used to install the fiberglass batt and membrane at the same time Excess fiberglass batt and membrane vapor retarder Vapor retarder A material that slows the passage of water vapor and contains a perm rating above 1 extending below the cavity will be rolled and tucked into the cavity A poly-encased fiberglass batt may be used in place of the fiberglass batt and membrane assembly The membrane will be installed in contact with the side of the wall that is compatible with the local climate zone	Maintain integrity of the batt Aid in the installation process
4.1104.1e Sub-sheathing patch and repair	Subsheathing will be patched or repaired as necessary	Ensure the integrity of the drainage plane
4.1104.1f Reattachment	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 Return siding to existing conditions without damage
4.1104.1g 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