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For more than 35 years Great Northern Insulation, 100% Canadian owned & operated, has been your one-source professional building envelope solutions & fireproofing provider. We are the largest insulation/fireproofing company in Ontario offering complete supply & installation services for all types of construction projects including industrial, commercial, institutional, residential & agricultural. GNI provides a complete selection of spray-applied fireproofing products & services including cementitious, mineral fibre & intumescent options along with thermal barriers. Our experienced staff in conjunction with our choice suppliers, work with designers, architects, property owners, building inspectors & contractors to provide approved/workable/effective solutions & then deliver the highest performing & environmentally friendly products; on time, on budget & installed right - guaranteed.
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