ThermoFoam sprays Enverge closed-cell foam to commercial soffits — metal and concrete, balcony and walkway undersides — sealing cold-bridges and condensation on exposed undersides across the UK.
A commercial soffit is the underside of any floor, balcony, walkway or overhang exposed to outside or to an unheated space. Whether metal deck, concrete or mixed construction, it runs cold, bridges heat out of the rooms above, and chills floors. Where warm internal air reaches the cold underside, condensation, damp patches and mould follow — a persistent problem on exposed balcony and walkway soffits.
Closed-cell spray foam is sprayed directly onto the soffit, where it self-bonds and cures into a seamless, water-resistant insulating layer. It follows steel flutes, concrete profiles, fixings and service penetrations without gaps, warming the underside above dew point and breaking the thermal bridge in a way that rigid boards — with their cut joints and edges — cannot match cleanly.
The result is warmer floors above, reduced heat loss, and exposed undersides that no longer attract condensation or staining. The continuous sprayed layer suits the varied geometry of metal and concrete soffits alike, supports Part L thermal goals on commercial refurbishments, and the warrantied system carries a 25-year manufacturer-backed product warranty.
Insulating the soffit raises floor temperatures in the rooms above and cuts heat loss through exposed undersides.
Lifts cold soffit surfaces above dew point, ending the damp, staining and mould that exposed undersides attract.
Self-bonds to steel decks, concrete and mixed soffits alike, following flutes and profiles that boards can't seal.
Treats exposed balcony and walkway undersides, sealing the cold bridge between outside air and the floor inside.
Sprays tight around fixings, hangers and service runs, closing the gaps that boarded soffits leave open.
Improves thermal performance of exposed floors, helping commercial refurbishments meet building-regulation targets.
Exposed soffits — balcony and walkway undersides, undercrofts, metal decks and concrete overhangs — run cold and act as thermal bridges into the rooms above. Closed-cell foam self-bonds to the soffit as it cures, warming the surface, sealing draughts and stopping the condensation that forms where warm interior air meets cold exposed structure.
ThermoFoam applies Enverge closed-cell spray foam (Nexseal LE) to clean, sound metal and concrete soffits. Duratite is the UK distributor of record. The foam self-bonds as it cures into a seamless, water-resistant insulating layer that warms the soffit, controls condensation and breaks the cold bridge through exposed undersides.
Typical published values for Enverge Nexseal LE closed-cell foam. Full technical specification →
Sprayed directly to the underside of concrete slabs, car-park decks and metal soffits, closed-cell foam forms one continuous insulated layer with no joints, fixings or cold bridges — the failure points board systems can't avoid on soffits. The foam's low exothermic reaction and strong adhesion make it suitable for overhead application to concrete, Metsec decks and steel framing alike.
Depths of 25–100 mm are specified to hit the required U-value, and where the soffit needs a fire-rated finish the system is completed with DC315 intumescent coating for Euroclass B-s2,d0. The result: warm floors above, no condensation staining below, and a 25-year manufacturer-backed warranty.
Tell us about your soffits & building.
Free survey of your soffits & condensation check.
The right system for your soffits.
Approved applicators, minimal disruption.
Handover pack & 25-year warranty.
Underside of a car-park deck sealed and insulated in-situ.
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Send us your building details and our technical team will specify the right system and a clear budget. No obligation.
Any exposed underside of a floor, balcony, walkway, undercroft or overhang — metal deck, concrete or mixed. If it runs cold and bridges heat out of the space above, a sprayed closed-cell layer can warm it and stop condensation forming on it.
Yes. The foam self-bonds in-situ to clean steel decks, concrete and mixed soffits as it cures. It follows flutes, profiles, fixings and penetrations without gaps, sealing far more completely than rigid boards with their cut joints and edges.
Yes. Exposed balcony and walkway soffits run cold and attract condensation where warmer air meets them. Insulating the underside lifts that surface above dew point, ending the damp patches, staining and mould that follow.
No. Closed-cell foam self-bonds to the substrate as it cures — no mechanical fixings, boards or fasteners. That seamless bond is what lets it seal around hangers and services that a boarded soffit would leave bridged.
Yes. We install Enverge closed-cell foam (Nexseal LE), supplied with Duratite as UK distributor of record. It carries a 25-year manufacturer-backed product warranty and suits commercial and industrial soffits.
Typically 25–100 mm depending on the target U-value and the structure — confirmed at the free survey and specified in writing before work starts.
Yes — the foam bonds with a low exothermic reaction and no mechanical fixings, making it well suited to concrete slabs, Metsec decks and steel structures.
With a DC315 intumescent finish the system achieves Euroclass B-s2,d0 — commonly specified for car parks and occupied buildings.
Specialist commercial spray foam, installed UK-wide by the Duratite Group's spray foam specialists.
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