Home›Quonset Hut Insulation
Spray foam that bonds directly to curved corrugated steel — the only insulation that follows every contour of your quonset hut, Nissen hut or arch building. Applied to the interior of the arch, Nexseal LE creates a seamless thermal and moisture barrier that follows every rib and contour of the semi-circular profile.
Nexseal LE is a closed-cell spray polyurethane foam — performance declared to I.S. EN 14315-1 — that bonds directly to curved corrugated steel with exceptional adhesion. Applied to the interior of the arch, it creates a seamless thermal and moisture barrier that follows every rib and contour of the semi-circular profile. With a lambda value of 0.027 W/m·K and an integral vapour barrier, it eliminates condensation on cold steel — all without any framework, battening or fixings through the sheeting.
Why traditional methods fail: PIR boards and rigid insulation cannot follow the semi-circular profile — they must be cut into narrow strips and forced against the curve, leaving massive air gaps behind every piece. Installing traditional insulation requires building an expensive timber or metal framework to create flat surfaces inside the curve: it wastes valuable headroom, costs thousands in materials and labour, and still leaves condensation paths where the framework meets the steel. Mineral wool simply sags and falls away from the curved underside under its own weight — while the curved profile channels condensation into concentrated drip lines.
The curved corrugated steel construction of quonset huts, Nissen huts and Romney huts makes spray foam the only insulation that can deliver complete coverage.
Applied as a liquid that expands on contact, naturally following every curve, rib and corrugation of the semi-circular arch. No cutting, no forcing, no gaps.
Traditional insulation in a quonset hut requires thousands of pounds of framework. Foam bonds directly to the curved steel — no battens, studs or secondary structure.
Nexseal LE closed-cell foam is its own vapour barrier. No separate membrane — warm moist air never reaches the cold steel, eliminating condensation.
Foam bonds across the corrugation profile, stiffening the thin steel sheeting and reinforcing the arch. Particularly valuable on older buildings where steel has thinned.
Every screw or bolt through the corrugated steel is a potential leak point and corrosion site. Foam bonds by adhesion alone — zero penetrations, zero risk.
From the base of one wall, across the full arch and down the other side — one continuous thermal envelope with no joints, laps or cold bridges.
Uninsulated quonset huts and Nissen huts suffer severely from condensation. The curved corrugated steel channels moisture into concentrated drip lines that run directly onto contents below.
The curved arch concentrates condensation into heavy drip lines. Foam raises the steel surface temperature above the dew point — no moisture ever forms on the internal surface.
The valleys in the curved arch act as channels, directing condensation into streams that drip at the lowest points. Foam fills every valley and seals the entire surface.
Persistent condensation on unprotected steel causes internal corrosion that weakens the structure over time. Foam seals the steel surface from moisture completely.
Condensation dripping onto stored goods, machinery, vehicles and materials causes rust, mould and damage. Eliminating it protects everything inside.
Uninsulated corrugated steel has almost zero thermal resistance. Foam transforms the envelope — lower heating costs in winter, cooler interior in summer.
Framework-based insulation eats into the already limited headroom of a curved arch. Foam adds just 25–75mm to the steel surface.
The Nissen hut was invented in 1916 by Major Peter Norman Nissen of the Royal Engineers — over 100,000 were produced during WWI alone, with hundreds of thousands more in WWII. The quonset hut is the American equivalent, developed in 1941 at Quonset Point Naval Air Station in Rhode Island with a wider profile and interior lining — over 150,000 were built during WWII and shipped worldwide. The Romney hut is the larger British variant, used as aircraft hangars and vehicle workshops.
These buildings were designed for rapid wartime deployment, not long-term comfort: single-skin steel, zero insulation, severe condensation, extreme temperature swings, corroding structure. Across Ireland and Northern Ireland they are now being converted into offices, studios, workshops, retail units, cafes, gyms and community spaces — and proper insulation is the essential first step in every conversion. Email info@duratite.ie for a free survey.
See how Nexseal LE closed-cell spray foam compares to traditional methods for insulating curved corrugated steel buildings.
| Property | Nexseal LE Spray Foam | PIR Boards on Framework | Mineral Wool Between Battens |
|---|---|---|---|
| Coverage of Curved Profile | Follows every curve seamlessly | Requires flat framework first | Sags away from the curve |
| Condensation Control | 100% — integral vapour barrier | Condensation behind boards | Absorbs moisture, worsens problem |
| Vapour Barrier | Built-in — closed-cell structure | Separate membrane needed | Separate membrane needed |
| Framework Needed | None — bonds directly to steel | Expensive timber/metal framework | Timber battening throughout |
| Internal Height Preserved | Yes — 25–75mm only | 150–200mm+ lost to framework | 100–150mm+ lost to battens |
| Structural Benefit | Stiffens corrugated sheeting | No structural contribution | No structural contribution |
| Speed of Install | 1–2 days typical | Several days — framework + boards | Several days — battens + wool + membrane |
| Longevity | Lifetime of building — no degradation | Boards can delaminate over time | Sags, compresses, absorbs moisture |
We survey your building — arch dimensions, steel condition, intended use, access arrangements and any specific requirements. This determines the correct thickness and approach.
We specify the Nexseal LE thickness based on building use and thermal requirements, and provide a fixed-price quotation. No hidden extras, no surprises.
Trained applicators spray Nexseal LE directly to the curved corrugated steel. The foam follows every rib and contour, creating a seamless insulated envelope. Cures in minutes.
You receive a completion pack with thickness verification and product datasheets. The building is immediately usable — no drying time, no framework to dismantle.
Completed by our approved installer network across Ireland and Northern Ireland.
A large quonset hut fabrication workshop suffering severe condensation, with water dripping onto machinery and workpieces. Nexseal LE at 50mm to the full curved arch — condensation eliminated completely, heated efficiently through winter.
A heritage Nissen hut used for equipment storage was corroding stored plant and tools. Spray foam at 35mm for condensation control — the building is now dry year-round, protecting valuable equipment from moisture damage.
A large curved arch building used for livestock housing and feed storage. Nexseal LE at 40mm for condensation control and thermal comfort — significantly reduced feed spoilage and healthier livestock conditions.
Nexseal LE applied to the curved corrugated steel of quonset huts and Nissen huts — bonding directly without framework.
As an authorised distributor of Enverge spray foam systems, Duratite supplies the products and technical backing; installation is carried out by our network of trained, approved applicators.
Factory-direct supply of Nexseal LE with full manufacturer backing, technical support and warranty coverage.
Every installer in our network is factory-trained on Enverge equipment and holds current spray foam qualifications.
No surprises. Every project is surveyed and quoted at a fixed price before work begins. Free surveys across Ireland and Northern Ireland.
Nexseal LE performance is declared to I.S. EN 14315-1 — backed by a 25-year manufacturer product warranty.
Duratite has delivered spray foam insulation since 2015 across commercial, residential, agricultural and industrial applications.
We insulate quonset huts, Nissen huts and curved arch buildings at locations across Ireland and Northern Ireland.
Independently certified products — tested to published standards. Email info@duratite.ie.
Common questions about spray foam insulation for quonset huts, Nissen huts and curved arch buildings.
The original British curved steel building — dedicated Nissen hut insulation page.
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Learn more →Book a free survey or request a callback from our curved arch building insulation team. We work at locations across Ireland and Northern Ireland.
Arch dimensions measured, steel condition assessed, fixed-price quotation provided.
Mon–Fri 8am–5pm · info@duratite.ie
Tell us about your building and we’ll recommend the right system — foam, waterproofing or both — surveyed, specified and quoted at no cost.
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