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Mineral Wool Cavity & Loft Insulation
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100mm Isover Glass Loft Roll Spacesaver Ready-Cut (12.180mtr) (14.12m2)Product code: JPN-30014975£36.46 £30.38/ Each -
200mm Isover Glass Loft Roll Spacesaver Ready-Cut (5.2mtr) (6.03m2)Product code: JPN-30015076£30.84 £25.70/ Each
About Our Mineral Wool Cavity & Loft Insulation
We stock a range of mineral wool cavity and loft insulation products that provide thermal and acoustic performance for residential and commercial properties.
Mineral wool remains the go to choice for cavity fill, loft upgrades, and sound reduction due to its non combustible A1 fire rating, breathability, and exceptional stability. We stock Isover glass mineral wool in both spacesaver loft rolls and rigid cavity slabs, in addition to Knauf acoustic rolls for partition walls and specialist applications.
Whether you're topping up existing loft insulation to meet current Building Regulations or specifying cavity batts for new build projects, our items cover standard and bespoke requirements.
Our Selection of Mineral Wool Cavity Wall Insulation & Loft Insulation Roll
Mineral wool cavity wall insulation comes in semi rigid slabs designed to fit snugly between masonry leaves, preventing cold bridging while allowing vapour permeability. Isover CWS 32 slabs are supplied in 100mm loft rolls and 150mm loft rolls to suit varying cavity widths, with each pack covering multiple square metres for efficient site logistics.
These batts are friction fit, holding position without mechanical fixings during block laying, and their glass fibre composition resists slumping over time.
Loft insulation rolls provide flexible coverage across joists, rafters, and irregular roof spaces. Isover spacesaver rolls are compressed for transport, then expand on site to achieve full thickness with minimal waste. Ready cut lengths simplify handling in confined loft areas, and the lightweight nature of glass wool makes solo installation a simple process.
Standard practice involves laying 100mm between joists, before cross laying a second layer perpendicular to eliminate thermal bypass. For acoustic control in timber frame separating walls or ceiling voids, Knauf and Isover acoustic rolls deliver higher density than standard loft wool, absorbing airborne sound transmission more effectively.
Our full insulation range contains multifoil membranes and vapour control layers to complete your thermal envelope.
Choosing Joseph Parr Northants for Mineral Wool Rolls
We understand the practical demands of site work and the importance of consistent material quality.
Our branch holds substantial stock of Isover and Knauf products year-round, avoiding the delays that often affect seasonal insulation availability.
We arrange delivery that aligns with your build schedule. Open a trade account to access preferential rates and flexible payment terms that support cash flow on larger projects.
Shop Mineral Wool Cavity & Loft Insulation at JP Northants
Shop mineral wool cavity and loft insulation at Joseph Parr Northants for quick delivery or collection to keep your project on track.
Get a quote for bulk orders or mixed loads combining mineral wool with other building materials. We offer crane offload delivery across the county, placing palletised insulation exactly where you need it on site. Contact us to find out more about our services.