Full Fill Cavity Boards

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Full Fill Cavity Wall Insulation Boards & Batts Full fill cavity wall insulation is engineered to completely occupy the cavity space between two masonry walls—eliminating air gaps and maximising thermal efficiency. This approach helps achieve low U-values , improve airtightness , and comply with Part L of the Building Regulations . At Insulation UK , we offer a full range of full fill cavity boards and batts , including solutions in phenolic , PIR , mineral wool , and glass wool . Whether your priority is ultra-low thermal conductivity, non-combustibility, or ease of installation, we stock leading systems trusted across residential, commercial, and industrial builds. Key Products in This Collection: Kingspan Kooltherm K106 Phenolic board with foil and fleece facings Outstanding thermal conductivity: 0.019 W/m·K Square-edged and ideal for masonry full-fill cavities Recticel Eurowall Full Fill PIR board with rebated edges for tight joints Thermal conductivity: 0.022 W/m·K Suitable for new builds and extensions Knauf DriTherm Cavity Slabs 32/37 Non-combustible glass mineral wool batts Friction-fit design, Euroclass A1 fire rated Ideal for full-fill masonry cavity walls Ideal For: Masonry cavity walls in new builds or extensions Projects requiring high thermal performance with minimal wall thickness Sites in exposure zones or areas prone to wind-driven rain Installations needing non-combustible or BBA-certified insulation At Insulation UK , all full fill products are available in a wide range of thicknesses and are ready for fast UK-wide delivery . We stock only top-performing brands to ensure your project stays compliant and energy efficient.