Linked from
The 10 pages that link to Building insulation, each with the reason it gives.
Climate change mitigationRelated: Better insulation lowers heating and cooling energy demand.
Building envelopeRelated: Insulation slows heat flow across the envelope’s walls, roofs, and floors.
PolystyreneRelated: Expanded and extruded polystyrene are widely used as rigid insulation boards.
ThatchingRelated: The thickness and trapped air in thatch can help moderate heat flow.