# Cavity Wall Insulation – Isover – 1200 × 455mm

This high-performance glass mineral wool full-fill cavity slab is designed to deliver excellent thermal performance in masonry cavity wall applications. Suitable for full-fill insulation systems, it helps improve energy efficiency within external walls and can achieve U-values as low as 0.23 W/m²K within a 300mm wall width, supporting compliance with or exceeding the requirements of Part L Building Regulations in England and Wales.

Manufactured to provide reliable thermal insulation while maintaining breathability within the wall structure, it is suitable for a wide range of residential and commercial construction projects. Its durable mineral wool composition also offers added fire resistance and helps support long-term building performance.

## Details

- **Price:** 39.51 GBP - 47.94 GBP
- **Vendor:** SAINT-GOBAIN ISOVER
- **Type:** Cavity Wall Insulation
- **Tags:** Building Materials, Cavity Wall Insulation, Insulation, Local

## Variants

| Variant | Price | Available |
|---------|-------|-----------|
| 50mm / 10.92m² | 40.19 GBP | In stock |
| 65mm / 8.74m² | 41.65 GBP | In stock |
| 75mm / 8.74m² | 47.94 GBP | In stock |
| 85mm / 6.55m² | 40.58 GBP | In stock |
| 100mm / 6.55m² | 39.51 GBP | In stock |

## Images

- Cavity Wall Insulation – Isover – 1200 × 455mm

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> Source: [Carvers Building Supplies](www.carvers.co.uk/products/cavity-wall-insulation-isover-1200x455x85mm-cws36-6-55m2-per-pk-20-per-pallet)
> Updated: 2026-06-16