Knauf DriTherm 37 Cavity Wall Insulation Slab 1200 x 455 x 85mm offers reliable thermal insulation for masonry cavity walls, helping to improve energy efficiency in domestic and commercial buildings. This glass mineral wool insulation slab is non-combustible, easy to handle, and fits securely within standard wall cavities. The DriTherm 37 is manufactured for long-term performance and resists moisture, making it a durable solution for reducing heat loss. Each pack covers 4.37m², providing an efficient way to meet building regulations and achieve consistent thermal protection.