The attic insulation shield is required to guard against the hazard of blown-in or blanket insulation filling any framed opening.

Attic insulation shield

Prevents debris and insulation from accumulating next to chimney pipe, fire safety accessory, need 2 inch clearance to combustible for UL requirement

Used whenever a ceiling support, finish support, or fire stop is installed below to guard against the hazard of blown-in or blanket insulation filling any framed opening