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
TitleSpecification(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