Bring curved, corrugated Nissen huts back into use — spray foam follows the arch where nothing else can, sealing and insulating in one pass.
Nissen huts — the curved corrugated-steel arches built for the British military through both World Wars — survive in their thousands on farms, former bases and rural sites, now reused as stores, workshops and livestock buildings. Their single-skin steel arch offers almost no insulation, so they run cold and damp, with condensation streaming off the curved sheets onto whatever is kept inside.
Enverge closed-cell spray foam self-bonds to the curved corrugated steel as it cures, following the sweep of the arch in one seamless layer with no battens, fabric or fixings. It insulates and air-seals the single skin in a single operation, keeping the steel above dew point so the persistent condensation that plagues these heritage arches finally stops forming.
The outcome is a dry, far warmer Nissen hut that protects its contents and the historic steelwork itself. Because the coating bonds tightly to the original profile, the character of the curved interior is retained while the building becomes genuinely usable — important where huts are listed, agricultural or being sympathetically brought back into commercial service.
Tailored to the WWI/WWII Nissen profile, preserving the historic curved steelwork while making it usable.
Keeps the curved single-skin steel above dew point so dripping condensation no longer soaks contents.
Self-bonds smoothly along the sweep of the corrugated arch with no battens or fabric.
Ideal for agricultural reuse — livestock buildings, machinery stores and rural workshops.
Transforms an uninsulated single skin into a far warmer, more workable interior.
Shields original arch sheets from the corrosion that trapped condensation would otherwise cause.
Closed-cell foam sprays straight onto the curved corrugated profile, sealing and insulating where boards can't go.
Enverge closed-cell spray foam (Nexseal LE) is applied to the inner face of the curved corrugated arch, self-bonding as it cures and expanding to follow every profile of the single-skin steel. The continuous, moisture-resistant layer insulates and air-seals in one pass, holding the steel above dew point to eliminate the condensation typical of these heritage structures.
Typical published values for Enverge Nexseal LE closed-cell foam. Full technical specification →
Curved, corrugated structures — Nissen huts, Quonset huts, grain silos — defeat rigid insulation entirely: boards can't follow the arch and battening destroys the interior. Sprayed closed-cell foam follows the curve exactly, bonding to every corrugation with zero penetrations of the original sheet.
A 15–25 mm coat protects stored contents from condensation; 50–80 mm brings the structure up to habitable, workable comfort. The cured foam also stiffens thinned, ageing steel — often the difference between demolishing a structure and giving it another working generation. Most are completed in 1–3 days.
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Free survey of your Nissen huts & condensation check.
The right system for your Nissen huts.
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Handover pack & 25-year warranty.
Send us your building details and our technical team will specify the right system and a clear budget. No obligation.
Often yes, but listed structures may need consent before works. We apply the foam internally so the external appearance is unchanged, and we'll discuss the approach with you and any conservation requirements before starting.
Yes. The foam bonds to the inner face of the curved steel and keeps it above dew point, so warm interior air no longer condenses on the arch. That ends the persistent dripping that affects single-skin Nissen huts.
Yes. Agricultural reuse is one of the most common applications. The seamless coating gives a drier, warmer interior for machinery stores, workshops and livestock buildings without losing the character of the original arch.
It's well suited to it. Spray foam is applied as a liquid that self-bonds and expands in place, so it follows the sweep of the arch and every corrugation seamlessly — something rigid boards and rolls struggle to achieve on a curve.
By stopping condensation forming on the inner steel, the coating removes the trapped moisture that drives corrosion of these older sheets, helping protect the historic arch while making the building usable again.
Yes — that's exactly what spray foam is for. It bonds to the curve directly with no battens, framework or fixings.
The cured foam adds meaningful rigidity to ageing corrugated sheets, extending the working life of the structure.
15–25 mm to protect contents from condensation, or 50–80 mm where the space is being brought into regular use.
Specialist commercial spray foam, installed UK-wide by the Duratite Group's spray foam specialists.
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