4.1006.1 Pull-Down Stairs

Topic: 
Attics
Subtopic: 
Attic Openings
Desired Outcome: 
Pull-down attic stair properly sealed and insulated
For supporting material, see Calculation of the Infiltration Credit and Referenced Standards.
TitleSpecification(s)Objective(s)
4.1006.1a
Installation

Hatches will be insulated to the maximum R-value structurally allowable up to the R-value of the adjoining insulated assembly

Pull-down stair rough opening will be surrounded with a durable dam that is higher than the level of the attic floor insulation

Counter-weights should be considered to ease accessibility for excessively heavy hatches

Achieve uniform R-value

Prevent loose insulation from entering the living area
4.1006.1b
Sealing

Entire pull-down stair assembly will be covered with an airtight and removable/openable enclosure inside the attic space

Pull-down stair frame will be caulked, gasketed, weatherstripped, or otherwise sealed with an 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, suitable film, or solid material that allows attic door operation

Prevent air leakage
4.1006.1c
Durability

Completed measure will meet a minimum expected service life of 20 years

Ensure a minimum expected service life
4.1006.1d
Occupant education

See redline change(s)

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