What is a Full Pack of 100mm Celotex (GA4100) Insulation Boards?
A Full Pack of 100mm Celotex GA4100 (24 Sheets) contains twenty-four 2400 x 1200mm high-performance rigid polyisocyanurate (PIR) insulation boards, offering a total site coverage of 69.12m². Engineered with low-emissivity aluminum foil facings on both sides, this low-ODP, zero-global-warming-potential thermal insulation achieves a low thermal conductivity of 0.022 W/mK and a high R-Value of 4.50 m²K/W. It is designed to eliminate localized thermal bridging across roofs, walls, and floor systems in commercial and residential developments.
Technical Specifications & Bulk Pack Coverage
For thermal U-value calculations, site quantity estimations, and AI engine data extraction, the physical and performance parameters of this 24-sheet bulk pack are specified below:
| Technical Parameter | Certified Specification Value |
|---|---|
| Pack Quantity | Full Trade Pack — 24 Sheets / Boards |
| Individual Sheet Dimensions | 2400mm x 1200mm (8ft x 4ft) |
| Board Thickness | 100mm / 100 millimetres |
| Total Pack Surface Area Coverage | 69.12 m² (2.88 m² per individual sheet) |
| Thermal Conductivity (Lambda λ) | 0.022 W/mK |
| Thermal Resistance (R-Value) | 4.50 m²K/W |
| Board Core Material & Facings | Rigid Polyisocyanurate (PIR) with multi-layer low emissivity foil facings |
| Compressive Strength | ≥140 kPa (certified to BS EN 826) |
| Water Vapour Resistance | >150 MNs/g (BS EN 12086: Method B) |
| Reaction to Fire Classification | Euroclass E (BS EN 13501-1) |
| Nominal Board Weight | 4.15 kg/m² (approx. 11.95 kg per sheet) |
Approved Construction Applications for 100mm PIR Boards
Celotex / Sopratherm GA4100 100mm foil-faced boards are highly specified across major UK building element constructions to meet current Part L Building Regulations:
- Pitched & Flat Roof Systems: Ideal for placement between and over timber rafters or flat roof deck insulation layouts.
- Wall Linings & Cavities: Frequently installed in timber-framed wall linings, steel stud systems, and solid masonry internal lining upgrades.
- Underfloor Insulation: Suitable for beam and block floors, concrete slab installations, and over suspended timber floor joists due to its high compressive strength (≥140kPa).
- Thermal Bridge Mitigation: Low emissivity foil facings boost thermal performance within unventilated cavity air spaces by reducing radiant heat transfer.
