Name a disadvantage of cellulose insulation.

Cellulose insulation is made primarily from recycled paper products and is treated with fire retardants to enhance its safety. However, one notable disadvantage of cellulose insulation is that it can settle over time. As it settles, the thickness and density of the insulation can decrease, leading to less effective thermal resistance. This can create gaps in coverage and reduce the overall effectiveness of the insulation in maintaining energy efficiency and regulating temperature within a building.

Proper installation techniques, such as ensuring adequate density during the blowing process, can help mitigate settling, but it remains a concern with this type of insulation material. The other options presented involve specific characteristics that may not necessarily apply to cellulose insulation in the same way, making the aspect of settling a critical and relevant point when assessing its disadvantages.