Accessible Attic - Batt Insulation Over Existing Insulation

Verify that installation area is free of:

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

energized or undammed 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

When vented eaves or soffits exist, mechanically fasten insulation baffles in every roof bay that extend above the final insulation level by at least 6"

Install a minimum of one insulation depth marker and one marker every additional 300 ft2 throughout installation area with measurement beginning at the air barrier

Install flags at all utility junctions that can be seen above the final level of the insulation

Select only unfaced insulation batts for installation over existing batt insulation that have a flame spread and smoke development index of 25/450 or less when tested in accordance with ASTM E84 or UL 723

Install batt insulation to prescribed R-value in full contact with the existing insulation batts without gaps, voids, compressions, or misalignments

If the top of the existing insulation is below the top of the framing, install new batts parallel with framing members

If the top of the existing insulation is above the top of the framing, install new batts perpendicular to framing members

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