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Closed-cell Enverge spray foam for shipping containers — a thin anti-condensation coat that stops container rain in storage and self-storage units, or a full conversion build-up that turns a steel box into a warm, dry office, workshop or studio. Bonds directly to the corrugated steel, sprayed in as little as a day.
A shipping container is single-skin corrugated steel with no insulation — a condensation factory. Nexseal LE closed-cell spray foam bonds directly to the corrugated walls, roof and doors of an ISO container, creating a seamless thermal barrier, vapour control layer and anti-condensation coating in a single application. At λ 0.027 W/m·K it delivers maximum thermal performance at minimal thickness — critical where every millimetre of internal space matters.
The right specification depends entirely on how the container is used. Storage containers need a thin anti-condensation coat. Container conversions need thicker insulation with stud framing for a plasterboard-ready finish.
A thin layer of Nexseal LE sprayed directly onto bare corrugated steel. Raises the surface above dew point and completely eliminates container rain. The corrugated profile stays visible. Ideal for storage, self-storage units and container yards.
Timber studs fixed to the container walls, with Nexseal LE sprayed between and over them for a continuous thermal envelope. Creates a flat, plasterboard-ready surface for offices, workshops, studios and pop-up retail.
Single-skin corrugated steel with no insulation is a condensation factory. Here is how closed-cell spray foam solves every aspect of the problem.
Warm moist air meets the cold steel roof and walls, forming droplets that drip onto stored goods. Causes mould, corrosion, packaging damage and stock write-offs.
Steel containers heat up rapidly in sun and cool fast overnight. These daily swings are the primary driver of condensation — especially in Ireland’s damp maritime climate.
Closed-cell foam raises the internal surface above dew point and acts as an integral vapour barrier. No cold surface means no condensation — a permanent fix, not a temporary measure.
Storage container businesses suffer most from condensation complaints — customers’ furniture, documents and electronics get damaged. Spray foam eliminates the problem across entire container fleets.
Unlike rigid board or foil-bubble insulation, spray foam follows every ridge and trough of the corrugated steel. No air gaps means no hidden condensation forming behind the insulation.
Anti-condensation spray foam pays for itself through reduced stock damage, fewer customer complaints and lower insurance claims. A one-time investment for permanent protection.
Duratite projects in the UK and Northern Ireland, delivered by approved installers.
A 40-unit self-storage facility with persistent condensation complaints. A 20mm Nexseal LE anti-condensation coat applied across all 40 containers over two weeks. Customer complaints dropped to zero.
Two 40ft containers converted into a site office complex for a construction company. Timber stud framework with 50mm Nexseal LE throughout walls, roof and floor — plasterboard-finished, heated and cooled year-round.
A single 40ft high-cube container converted into a woodworking workshop. 40mm Nexseal LE between studs on walls and roof, with OSB boarding — comfortable year-round with no condensation on tools or machinery.
Rigid board, foil-bubble wrap and fibreglass batts all leave gaps behind the corrugated profile. Only spray foam creates a continuous, bonded thermal barrier on corrugated steel.
Complete steel bonding. Spray foam bonds directly to corrugated steel walls, roof and doors. No air gaps, no fixings, no adhesive tape — the foam follows every corrugation for 100% coverage.
Integral vapour barrier. Closed-cell foam is a vapour barrier by nature. No separate membrane, no taping, no risk of condensation forming behind the insulation — the most common failure mode of board insulation in containers.
Space efficiency: at λ 0.027 W/m·K Nexseal LE reaches the target U-value in less thickness than the alternatives — preserving valuable internal space where every centimetre counts.
Both use the same Nexseal LE closed-cell foam — the difference is thickness, framing and finish. Here is how the two specifications compare across every metric that matters.
| Specification | RECOMMENDEDAnti-condensation coatMost popular · storage | Full conversion insulationFor occupied spaces |
|---|---|---|
| Product | Nexseal LE closed-cell | Nexseal LE + timber studs |
| Thickness | 15–25mm | 35–50mm+ |
| Timber studs | Not required — sprayed direct to steel | Yes — stud framework installed |
| Plasterboard-ready finish | No — corrugation stays visible | Yes — flat, board-ready surface |
| Condensation eliminated | Yes | Yes |
| Integral vapour barrier | Yes | Yes |
| Year-round occupied comfort | Not designed for heated use | Full thermal comfort |
| Typical install time | Half day – 1 day | 2–3 days |
| Internal space impact | Minimal — sprayed straight to steel | Reduced by the stud + board build-up |
| Best for | Storage, self-storage yards, container depots, goods protection | Offices, workshops, studios, retail, living spaces |
Shipping containers are used for an enormous range of purposes across Ireland and Northern Ireland — each needs a different insulation specification.
Nexseal LE at 50–80mm achieves TGD L compliance for habitable use, bonding to walls and ceiling.
Book a survey →A 25mm anti-condensation coat prevents container rain — protects inventory and cuts damage claims.
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Drying rooms, canteens and welfare cabins insulated for occupant comfort and welfare compliance.
Book a survey →Container bars, cafés, shops and event spaces — comfort, food safety and licensing compliance.
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Nexseal LE at 80–100mm holds controlled temperatures for chilled, pharma or sensitive goods.
Book a survey →Creative studios and workshops — warm in winter, cool in summer, no condensation on tools or machinery.
Book a survey →The journey from bare steel box to insulated, plasterboard-ready conversion — battened out, sprayed, and finished.
From initial assessment to completed insulation — a straightforward four-step process.
We assess your container’s condition, intended use and access. This determines whether you need an anti-condensation coat or a full conversion specification. Free and no-obligation.
We specify the Nexseal LE thickness, any stud framework needed and provide a fixed-price, fully installed quotation. No hidden charges, no surprises.
Enverge-trained applicators from our approved network spray Nexseal LE directly to the corrugated steel. Foam cures in minutes. Conversions get studs fitted first, then spray.
You receive thickness verification, product datasheets and warranty documentation. Conversions are left plasterboard-ready for your fit-out team.
Uninsulated steel containers are condensation traps — especially through autumn and winter. The right specification depends on whether the container stores goods or houses people.
Self-storage & container yardsA thin 15–25mm coat across roof and upper walls eliminates condensation and pays back through fewer damage claims and higher customer retention.
Container conversionsSite offices, studios, workshops and pop-up retail. Nexseal LE sprayed between timber studs creates a continuous thermal envelope with zero thermal bridging and a plasterboard-ready surface — Building Regulations-compliant where required.
Construction & logistics fleetsWelfare units, drying rooms, secure stores and equipment containers across multiple sites. Containers are sprayed in situ, individually or fleet-wide, with volume rates for larger orders.
The foam and specification are matched to the container and how it will be used. Request the technical documentation for your project.
The core container system: a spray-applied, two-component closed-cell foam that insulates and air-seals corrugated steel. Rigid, moisture-resistant and an integral vapour barrier, with a 25-year manufacturer-backed material warranty, and can be overcoated to a Euroclass B fire rating where required.
The written container insulation specification covers anti-condensation and full-conversion work — substrate preparation, thickness, stud framing, coverage and finish.
Trusted spray foam insulation specialists — delivering expert installations for shipping containers nationwide.
Over a decade delivering professional spray foam projects, including hundreds of shipping container installations across Ireland and Northern Ireland.
Commercial projects across Ireland and Northern Ireland including shipping containers, warehouses, hangars and industrial structures of every type.
Our approved installer network is directly trained and certified by Enverge, so every installation meets manufacturer specification.
We understand both sides — anti-condensation coats for storage businesses and full thermal insulation for container conversions.
Every project is handed over with thickness verification, product datasheets and warranty documentation — Nexseal LE carries a 25-year manufacturer-backed material warranty.
Competitive volume rates for multi-container sites. Self-storage operators, construction companies and logistics firms trust us for fleet-wide insulation.
From a single storage container that keeps sweating, to a fleet of self-storage units, to a full office or workshop conversion — closed-cell spray foam stops condensation and container rain at source and turns a cold steel box into useable, year-round space. Send your container size, use and a few photos and we’ll book your free site survey.
Straight answers to what container owners, self-storage operators and converters ask before booking a survey — on condensation, thickness, cost, Building Regs, in-situ spraying and warranties. Can’t see yours? Ask us directly and we’ll come back to you the same working day.
Condensation control and thermal insulation for boats and marine vessels.
Learn more →Metal roofsStop condensation dripping from corrugated metal roofs.
Learn more →IndustrialCut energy costs and stop condensation in warehouses.
Learn more →ModularAirtight thermal envelope for modular and portable buildings.
Learn more →StudworkAirtight insulation between timber or metal studs.
Learn more →HubExplore all commercial spray foam insulation applications.
Learn more →Send your container size, how it will be used and a few photos. We confirm the right specification and book your free survey.
Prefer to talk? Email info@duratite.ie — Mon–Fri, 8am–5pm.
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.
Condensation control and thermal insulation for boats and marine vessels.
Stop condensation dripping from corrugated metal roofs.
Cut energy costs and stop condensation in warehouses.
Airtight thermal envelope for modular and portable buildings.
Airtight insulation between timber or metal studs.
Explore all commercial spray foam insulation applications.
