noun, feminine

imperméabilisation

/ɛ̃.pɛʁ.me.a.bi.li.za.sjɔ̃/

noun, feminine/ɛ̃.pɛʁ.me.a.bi.li.za.sjɔ̃/plural: imperméabilisations

imperméabilisation is feminine in French.

waterproofing

From imperméabiliser + -ation.