Prefer insulation made of natural materials, recycled cellulose, or minerals. Good options include cork, wood fiber, sheep’s wool, hemp, and certain fiberglass and mineral wool.

Avoid plastic foam insulation, whether board or spray-applied.

For board insulation, prefer expanded cork, wood fiber, and unfaced formaldehyde-free fiberglass or mineral wool.

For blown and batt insulations, consider the binders and facers used. 

Avoid products with formaldehyde binders or flame retardant facings. 

Use mechanical methods, like fasteners, over adhesives for installation. 

Pick products that provide full content details via Health Product Declarations (HPDs).