How To Insulate A Garden Room

Fast Facts: Garden Room Insulation Insulating a medium-sized garden room typically costs £500–£2,000 in total. Insulation boards and Rockwool both run £20–£30 per m²; vapour barrier adds just £1–£2 per m². Insulation thickness typically ranges from 25mm to 100mm, depending on the area and material. PIR boards give the best thermal performance for the least thickness – ideal where space …

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