Knauf Loft Insulation 100mm

13.89m2 per pack Knauf Loft Roll 44 (100 mm) is a high‑performance glass mineral wool insulation quilt designed for use at ceiling level in cold lofts and pitched roofs.  It has a thermal conductivity of 0.044 W/m·K, giving an R‑value of about 2.25 m²·K/W for the 100 mm thickness.  The roll is “combi‑cut” — partially perforated so it can be split into widths to suit either 400 mm or 600 mm joist centres (3 × 380 mm strips or 2 × 570 mm), or used full width for faster install. It's non‑combustible, with Euro class A1 fire‑rating, made with Knauf’s ECOSE® bio‑based binder (so lower in formaldehyde and reduced environmental impact), and is lightweight and compression‑packed for easier handling. It also resists rot, mould, vermin, etc., being non‑hygroscopic and odourless.