9.25.2.4. Installation of Loose-Fill Insulation

  1. Loose-Fill Insulation is normally used on horizontal surfaces, and the only exception is in a sloped ceiling where supporting slope is less than: 4.5 in 12 for mineral fibre or cellulose fibre insulation or 2.5 in 12 for other types of insulation.
  2. Loose-Fill is permitted for use in Existing Walls (retrofits).
  3. Where Blown-in is installed in wood-framed (above or below grade), of new buildings:
  • Density must be enough to prevent settlement.
  • Must be installed behind a see-through membrane so that a visual inspection is possible.
  • Must be installed so that it won't interfere with the installation of the interior finish.
  • No water can be added to the insulation, unless it can be shown that the added water will not adversely affect other materials in the assembly.

4. Water repellent Loose-Fill insulation is permitted to be used between the outer and inner wythes of masonry cavity walls.

5. Where soffit venting is used, measures shall be taken

  • To prevent Loose-Fill 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
  • To minimize airflow into the insulation near the soffit vents to maintain the thermal performance of the material.