Batt Insulation

Verify that installation area is free of:

active water leaks, fuel leaks (i.e., gas, oil, propane), and pest intrusions

energized knob and tube wiring

uncovered electrical junctions

improperly terminated devices (ventilation fans, dryers, plumbing stacks, condensate lines, combustion appliance flues/chimneys, etc.)

unshielded high-temperature devices (non-IC rated recessed lights, chimneys, flues, vents, etc.) unless they are zero clearance devices

insulation escape openings

Verify that installation area is:

intact, able to support insulation weight, and air sealed

Select batt insulation that has a class II vapor retarder facing and that has a flame spread and smoke development index of 25/450 or less

Select encapsulation material that is a permanent air barrier, a class II vapor retarder, and has a smoke development index of 450 or less when tested in accordance with ASTM E84 or UL 723

Select sealants that:

are compatible with their intended surfaces

allow for differential expansion and contraction between dissimilar materials

meet the requirements of the applicable fire safety code (e.g., thermal or ignition barriers)

Remove any existing insulation or vapor barrier materials from installation area

Install batt insulation to prescribed R-value in every joist bay in full contact with the rim/band joist air barrier and all sides of the cavity without gaps, voids, compressions, or misalignments

If batt contains a facing material install it toward the conditioned space

Seal each cavity airtight around the perimeter of faced batts or around the perimeter of the encapsulation material

Post a dated receipt signed by the installer that minimally includes: Installed insulation type, coverage area, installed thickness, and installed R-value