in·su·la·tion 
/ˌɪnsəˈleɪʃən, Brit ˌɪnsjʊˈleɪʃən/ noun
/ˌɪnsəˈleɪʃən, Brit ˌɪnsjʊˈleɪʃən/ noun [noncount] 1 : a material or substance that is used to stop heat, electricity, or sound from going into or out of something : a material that insulates something
▪ They used fiberglass insulation. 2 a : the quality or state of being insulated
▪ These materials provide the insulation needed in cold weather.
b : the act of insulating something
▪ I hired them to do the insulation of the attic. [=to insulate the attic]
▪ They used fiberglass insulation.
▪ These materials provide the insulation needed in cold weather.
b : the act of insulating something
▪ I hired them to do the insulation of the attic. [=to insulate the attic]
