Anti-Condensation Spray Foam Insulation
Stop roof drip, corrosion and stock damage for good. Closed-cell spray foam seals metal and asbestos roofs in a single application — installed UK-wide.
Why spray foam for commercial roofs
In commercial and industrial buildings with single-skin metal roofs, warm internal air meets cold steel and condenses on the underside, dripping onto stock, plant and floors. This roof drip is mistaken for a leak, but it is interstitial condensation forming where the dew point falls on the cold deck. Left unchecked it corrodes purlins, soaks insulation and disrupts operations beneath.
Enverge closed-cell spray foam self-bonds directly to the underside of the cold metal deck as it cures, leaving no gap for moist air to reach the cold surface. By keeping the substrate above dew point and sealing every overlap and fixing, it stops condensation forming at source rather than just catching drips after the fact.
The result is a dry, stable internal environment that protects stored goods, machinery and the steel frame itself. Corrosion is arrested, the roof structure is preserved, and businesses avoid the recurring cost and downtime of chasing phantom leaks across single-skin roofs season after season.
The benefits for commercial roofs
Stops Drip At Source
Seals the cold deck so warm air never reaches dew point on the cold steel surface.
Arrests Steel Corrosion
Keeps purlins and sheets dry, halting the rust that condensation drives across steel over the years.
Protects Stored Stock
Eliminates roof drips onto racking, machinery and finished goods stored on the floor below.
Dew Point Control
Holds the substrate above dew point, preventing the interstitial condensation that forms inside the roof.
Seamless Air Seal
Self-bonds over every lap, fixing and joint, leaving no gaps for moist air to migrate.
Long-Term Fix
Replaces endless seasonal leak-chasing with one permanent, single-application solution that lasts for years.
Closed-cell, in a single pass
Enverge closed-cell foam bonds tightly to metal, cement-fibre and asbestos, sealing the roof and stopping condensation for the life of the building.
The closed-cell foam self-bonds to the cold metal underside, raising its surface temperature above dew point so warm internal air can no longer condense on it. Its low vapour permeability and continuous airtight seal block moist air migration to the cold deck, while the rigid cured layer adds durability and corrosion protection to the steel.
- Eliminates condensation on single-skin metal roofs
- 25-year manufacturer-backed warranty
- Self-bonds with no gaps, fixings or fabric needed
- Protects steel structure and stock from moisture damage
Enverge Nexseal LE — verified performance
Typical published values for Enverge Nexseal LE closed-cell foam. Full technical specification →
Specification & compliance for commercial roofs
Closed-cell foam bonds chemically to profiled metal, box-profile and cement-fibre sheets, following every ridge and trough with no fixings, battens or framework. Because the foam carries its own integral vapour barrier, the cold underside that condensation forms on is removed in the same pass — a 15–25 mm coat is typically enough to stop drip, while 25–75 mm delivers a genuine thermal upgrade with U-values down to around 0.18 W/m²K in the right build-up.
Application progresses quickly across open spans, so live operations can usually keep running while zoned sections are sprayed. Where a fire-rated finish is specified, the foam is coated with DC315 intumescent to achieve Euroclass B-s2,d0, and every installation is handed over with full documentation and a 25-year manufacturer-backed product warranty.
Where we install commercial roofs spray foam
Dedicated local pages for every major city — and we cover the towns and villages between them.
From enquiry to warranty
Enquire
Tell us about your commercial roofs & building.
Survey
Free survey of your commercial roofs & condensation check.
Specify
The right system for your commercial roofs.
Install
Approved applicators, minimal disruption.
Warranty
Handover pack & 25-year warranty.
Real commercial roofs spray foam applications
Commercial projects
Depot Events, Cardiff
Closed-cell spray foam across a large warehouse-style venue roof.
Ibstock Brick
Insulation for a temperature-critical manufacturing process.
The Box, Plymouth
Concrete spray foam eliminating cold-bridging and condensation.
Get a quote for your project
Send us your building details and our technical team will specify the right system and a clear budget. No obligation.
Anti-Condensation insulation, answered
Why does my metal roof drip when there is no rain?
That is condensation, not a leak. Warm internal air hits the cold underside of the steel and the moisture in it condenses once the surface falls below dew point. Spray foam keeps the deck warm and sealed so it cannot form.
Will spray foam stop existing corrosion on the purlins?
It halts further corrosion by keeping the steel dry and above dew point, removing the moisture that drives rust. Heavily corroded members should be assessed first; the foam then protects sound steel from future condensation damage.
Can it be applied while we keep operating?
In most commercial settings work is phased zone by zone so operations continue. We discuss access, racking clearance and ventilation during survey to plan around your production or storage schedule.
Does it work on any roof pitch or profile?
Yes. Because the foam self-bonds to the substrate, it follows any profile or pitch, sealing box profiles, corrugated sheets and complex eaves or ridge junctions equally well, all without separate fixings or fabric.
Is the closed-cell foam certified for this use?
Yes, the Nexseal LE closed-cell foam we install is manufacturer-certified under Agrément 09/4610 and carries a 25-year manufacturer-backed product warranty, giving specifiers and building owners documented, independent assurance for commercial condensation control.
What depth of spray foam does a commercial roofs need?
A 15–25 mm anti-condensation coat controls drip on most profiled metal roofs. Where thermal upgrade is the goal we typically apply 25–75 mm of closed-cell foam — the exact depth is specified after a free survey.
What fire rating can the system achieve?
Enverge closed-cell foam achieves BS 476 Part 7 Class 1 uncoated, and Euroclass B-s2,d0 when finished with a DC315 intumescent coating. We specify the right build-up for your building's use.
Can you work around a live operation?
Yes — application progresses across large areas each day in zoned sections, so production, storage and staff can usually continue working throughout.
Insulate your commercial roofs the right way
Specialist commercial spray foam, installed UK-wide by the Duratite Group's spray foam specialists.
Book a Free Survey →or call 01208 832 602