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
TitleSpecification(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