4.1301.13 Pier Construction Subfloor Insulation—Loose Fill with Rigid BarrierTopic: Floors

Topic:

Floors

Subtopic:

Accessible Floors

Desired Outcome:

Maintain a consistent, uniform thermal boundary Thermal boundary The separation between the interior and exterior environments of a building that slows heat flow between conditioned and unconditioned space to prescribed R-value of an adjoining insulated assembly

Multifamily Homes

Title	Specification(s)	Objective(s)
4.1301.13a Subfloor preparation	Sealing between conditioned space and crawl space will be completed before insulating	Prevent air leakage
4.1301.13b 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	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 mechanically fastened to underside of floor assembly Seams and penetrations will be sealed Rigid barrier will be resistant to pests At minimum, all gaps larger than 1/4" x 1/4" will be stuffed with copper metal mesh or other rodent-proof material If rodents can easily get their mouth around corners, they will be reinforced with hardware cloth or metal angle (e.g., gypsum board bead)	Relocate 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
4.1301.13c Installation	Loose-fill insulation will be installed between 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 subfloor in accordance with manufacturer specifications to achieve required density, maintain consistent coverage, and achieve specified R-value Insulation will be installed to prescribed R-value	Insulate to prescribed R-value
4.1301.13d Building operations staff education	A dated receipt signed by the installer will be provided that includes: Insulation type Coverage area R-value Installed thickness and minimum settled thickness Number of bags installed in accordance with manufacturer specifications	Document job completion to contract specifications Confirm amount of insulation installed Ensure ability to match bags required for total area completed Comply with 16 CFR 460.17