• Prevent loose-fill insulation from blocking the soffit vents to maintain air flow from the vents into the attic or roof space
• Minimize air flow into the insulation near the soffit vents to maintain the thermal performance of the material

9.25.2.4.6) Where soffit venting is used, measures shall be taken

a) to prevent loose-fill insulation from blocking the soffit vents and to maintain an open path for circulation of air from the vents into the attic or roof space, and

b) to minimize air flow into the loose-fill insulation near the soffit vents to maintain the thermal performance of the material.