Bulk Buy - 170mm Knauf Loft Roll 44 Combi-cut 1140mm x 7.03m - 8.01m2 per roll

Buying the 170mm Knauf Loft Roll 44 Combi-cut by the pallet is the economical route when a job needs taking to the standard loft depth, since this is the one thickness that does it in a clean two-layer build-up. Lay a 100mm roll between the joists, then run the 170mm across the top at right angles, and the total reaches 270mm, the depth commonly used to achieve the 0.16 W/m²K roof U-value target under Part L of the Building Regulations. Crossing the second layer over the joists like this also breaks up thermal bridging through the timber, so the coverage performs more evenly. Where a project calls for more, a second 170mm layer over the base takes the total to 440mm. It suits cold pitched roofs at ceiling level and works between joists in suspended timber floors too. The roll runs at a thermal conductivity of 0.044 W/mK with a thermal resistance of 3.85 m²K/W, and being glass mineral wool it brings some acoustic absorption with it, taking the edge off airborne sound coming through the ceiling. Each one is 1140mm wide and 7.03m long for 8.01m² of cover, and the combi-cut perforations mean you can tear it down to 2 x 570mm or 3 x 380mm for standard joist spacings, or keep it full width for a quick cross-laid pass with minimal waste. Light enough to move around the loft and simple to cut, it keeps the install within reach of a confident DIYer as much as a trade team. It's built with ECOSE® Technology, Knauf's bio-based binder, which means no added formaldehyde or phenol, CFC & HCFC free, and zero ozone depletion potential, with up to 80% recycled glass going into every roll. Rot proof, odourless & non-hygroscopic, it won't draw vermin or feed mould, fungi or bacteria, and it'll last as long as the building does. A solid, no-fuss choice for retrofit & new build alike. Benefits Buying in bulk offers better value on larger projects and helps keep material costs down The practical choice for reaching the 270mm standard loft depth as a cross-laid layer over a 100mm base Thermal resistance (R-value) of 3.85 m²K/W for the 170mm roll Thermal conductivity of 0.044 W/mK for reliable, effective thermal performance Euroclass A1 non-combustible: the best possible fire classification, meaning the product does not burn Combi-cut format, partially perforated at 2 x 570mm & 3 x 380mm to suit standard joist centres Also suitable as a primary single layer between joists, or in suspended timber floors Lightweight, low-itch & easy to handle on site Manufactured with ECOSE® Technology, a bio-based binder with no added formaldehyde or phenol Made with up to 80% recycled glass content: CFC free, HCFC free, with zero ozone depletion potential Rot proof, odourless & non-hygroscopic: will not attract vermin or support mould or fungi BRE Green Guide rating A+ Good to know Each roll covers 8.01m² 100mm base plus a 170mm cross-laid layer gives 270mm total, the standard depth for the 0.16 W/m²K roof U-value target under Part L 100mm base plus two 170mm cross-laid layers gives 440mm total, for a U-value of approximately 0.10 W/m²K where higher performance is wanted Thickness: 170mm; width: 2 x 570mm or 3 x 380mm; length: 7.03m Thermal resistance: 3.85 m²K/W; vapour resistivity: 5.00 MNs/g.m Keep insulation clear of downlights & other heat-producing fixtures, using non-combustible covers where required Store indoors, dry & flat; protect from prolonged sunlight & moisture Always refer to the Knauf Loft Roll Installation Guide before installation