4.1005.5 Enclosed Bonus Room Floor Over Unconditioned Space—Dense Pack Installation

Topic:

Attics

Subtopic:

Attic Floors

Desired Outcome:

A 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 controls the heat flow

For supporting material, see Calculation of the Infiltration Credit and Referenced Standards.

Single-Family Homes

Title	Specification(s)	Objective(s)
4.1005.5a 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	Existence of 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 material in line with the knee walls will be installed or verified when dense packing 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 material will not bend, sag, or move once dense packed	Hold dense pack Dense pack The process of installing loose-fill insulation to reduce air flow and perform to a stated R-value in place
4.1005.5b Fill floors	Each cavity will be 100% filled to consistent density: Cellulose material will be installed to a minimum density of 3.5 pounds per cubic foot or to a maximum density structurally allowable Loose fiberglass material will be installed and will be specifically approved for air flow resistance to a minimum density per the manufacturer's recommendations The number of bags installed will be confirmed and will match the number required on the coverage chart Insulation will be verified to prevent visible air movement at 50 pascals of pressure difference using chemical smoke or other approved verification method by the authority having jurisdiction	Eliminate voids and settling Minimize framing cavity air flows
4.1005.5c Safety	Insulation will not be allowed on top of non- IC IC Insulation contact rated can light Can light A light fixture (or can) that is recessed into the ceiling boxes or between a heat-generating appliance and a dam, unless material is rated for contact with heat generating sources	Prevent a fire hazard
4.1005.5d 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