4.1303.2 Insulation of Floor Cavity with Batt Material

Topic:

Floors

Subtopic:

Manufactured Housing Floor Cavity Insulation

Desired Outcome:

Consistent thermal boundary Thermal boundary The separation between the interior and exterior environments of a building that slows heat flow between conditioned and unconditioned space that reduces heat flow

Manufactured Housing

Title	Specification(s)	Objective(s)
4.1303.2a R-value	Insulation will be installed in accordance with recommended R-value and density	Insulate to prescribed R-value for the climate zone
4.1303.2b Work assessment	Ensure complete accessibility of floor cavity Clean floor cavities Remove all remnants of previous insulation and bottom board	Ensure work area is clean, safe, and ready to accept insulation
4.1303.2c Insulate floors	Each cavity will be insulated to specified R-value and density If insulation has facing, facing will be in contact with the heated side Insulation will be in contact with subfloor Insulation will not have gaps, voids, or be compressed Insulation will be supported (e.g., metal insulation supports) to maintain a permanent contact with subfloor Insulation will be notched around all wires, pipes, and blocks Ducts and water lines will be insulated for climate conditions Water lines will be located above the warm side of the insulation (toward the conditioned space), when feasible A rigid 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 will be installed in contact with the bottom of the joists, when feasible Rigid 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 will be fastened as to not sag, bend, or fall off Seams, holes, and joints in the 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 will be sealed In cases where HVAC HVAC Heating, ventilation, and air conditioning ducts hang below the level of the rigid 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 and insulation, the ducts will be insulated 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 provided that is sealed to the rigid 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	Eliminate voids Minimize conductive heat transfer across the floor system Ensure durability Minimize convective heat transfer Keep pipes from freezing
4.1303.2d Materials	Insulation materials will be of minimal water absorbency and flame spread, and smoke-developed index for insulation will be in accordance with IRC IRC International Residential Code Foam plastic insulation will comply with IRC IRC International Residential Code Fasteners will be corrosion resistant	Ensure durability Prevent moisture damage
4.1303.2e Occupant education	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