The UK's leading closed cell spray foam insulation. Performance declared to BS EN 14315-1, Euroclass B fire rated with DC315, and a 0.027 W/mK lambda. Manufactured by Enverge, distributed by Duratite.
Full performance data for Nexseal LE, as declared by the manufacturer to BS EN 14315-1.
| Property | Value | Test Standard |
|---|---|---|
| Thermal Conductivity (Lambda) | 0.027 W/mK | BS EN 14315-1 |
| Density (Nominal) | 32–40 kg/m³ | BS EN 14315-1 |
| Closed Cell Content | >90% | ASTM D6226 |
| Water Vapour Resistance | High — acts as VCL | BS EN 12086 |
| Compressive Strength | 78 kPa | BS EN 826 |
| Fire Classification (European) | Euroclass B-s2,d0 (with DC315) | BS EN 13501-1 |
| Fire Classification (British) | Class 0 / Class 1 (with DC315) | BS 476 Part 7 |
| Declared performance standard | BS EN 14315-1 | BS EN 12667 (lambda) |
| Blowing Agent | HFO (low GWP, zero ODP) | — |
| Service Temperature Range | -50°C to +100°C | — |
| Adhesion | Bonds directly — no mechanical fixings | — |
| Dimensional Stability | Stable — will not shrink or settle | BS EN 1604 |
Nexseal LE is specified across a wide range of commercial, industrial, and specialist applications. Click through to our dedicated application pages for detailed technical guidance.
Concrete and metal soffits in car parks, commercial buildings, and industrial structures.
Sheet piling, king post walls, and retaining structures for thermal and condensation control.
Aircraft hangars and large steel structures — eliminates condensation on cold steel.
Pool halls, enclosures, and plant rooms — controls condensation in high humidity environments.
Narrowboats, barges, and marine vessels — bonds to steel hulls, eliminates condensation.
Container conversions — maximises internal space while eliminating condensation.
Timber and metal stud walls — fills every gap, eliminates thermal bridging.
Box profile, cement fibre, and standing seam roofs — bonds to every ridge and trough.
Nissen huts and curved arch buildings — the only insulation that follows every contour.
How Nexseal LE compares with other spray foam products available in the UK market.
| Product | Lambda (W/mK) | Closed Cell | UK Distributor |
|---|---|---|---|
| Nexseal LE | 0.027 | >90% | Duratite |
| Icynene ProSeal | 0.028 | >95% | Icynene UK |
| Huntsman H2 Foam Lite | 0.035 | Open cell | Huntsman |
| Lapolla Foam Lok | 0.028 | >90% | Various |
Approximate insulation thickness needed to achieve common U-value targets. Nexseal LE's low lambda value of 0.027 W/mK means thinner build-ups compared to other insulation types.
| Target U-Value (W/m²K) | Nexseal LE (0.027) | PIR Board (~0.022) | Mineral Wool (~0.040) |
|---|---|---|---|
| 0.25 | 85mm | 90mm | 140mm |
| 0.20 | 110mm | 115mm | 175mm |
| 0.15 | 145mm | 150mm | 230mm |
Note: Values are approximate and assume a single-leaf construction. Actual U-values depend on the full build-up. Contact our technical team for project-specific calculations.
Thermal, fire and moisture performance declared to BS EN 14315-1 and backed by a 25-year manufacturer product warranty — the evidence building control, warranty providers and lenders ask to see.
Monolithic application creates a continuous insulation and air barrier with zero joints, gaps, or thermal bridges.
Over 90% closed cell content means Nexseal LE acts as a vapour control layer — no separate membrane needed.
Spray application bonds to any substrate and follows any profile — curved, corrugated, irregular, or complex.
Duratite is the UK distributor of Enverge spray foam products. We supply Nexseal LE direct and through our approved installer network.
Nexseal LE available in standard drum sets for approved contractors. Contact us for current pricing and lead times.
Our approved installer network covers the entire UK. We will connect you with your nearest qualified installer.
U-value calculations, specification writing, NBS clauses, and compliance guidance available from our technical team.
Contact our team for pricing, technical data sheets, U-value calculations, or to find your nearest approved installer.
Tell us about your building and we’ll recommend the right system — foam, waterproofing or both — surveyed, specified and quoted at no cost.
