Used on horizontal surfaces only, unless…

• In sloped attics it has a slope less than 4.5/12 for mineral fibre or cellulose and 2.5/12 for other types
• Allowed in wood-framed walls of existing buildings

Illustration Source: Summerhill

9.25.2.4.1) Except as provided in Sentences (2) to (6),loose-fill insulation shall be used on horizontal surfaces only.

9.25.2.4.2) Except where there is no attic space above the insulation, where loose-fill insulation is installed in an unconfined sloped space, such as an attic space over a sloped ceiling, the supporting slope shall not be more than

a) 4.5 in 12 for mineral fibre or cellulose fibre insulation, and

b) 2.5 in 12 for other types of insulation.

9.25.2.4.3) Loose-fill insulation is permitted to be used in wood-frame walls of existing buildings.