Seamless, self-flashing insulation for commercial flat roofs — no gaps, no cold-bridging. manufacturer-certified, installed UK-wide.
Commercial flat roofs over offices, retail units and industrial premises are notorious for poor thermal performance and persistent cold bridging. Where insulation sits between or above the deck it is often interrupted by upstands, services and parapets, and on refurbishment projects there is rarely the headroom or budget to strip back and rebuild the entire warm-roof build-up from scratch.
Enverge closed-cell spray foam is applied to the soffit or underside of the flat deck, self-bonding as it cures to form a seamless, fully adhered insulating layer with no joints or fixings to bridge. It hugs the deck profile, seals around penetrations and beam junctions, and upgrades thermal performance without disturbing the existing waterproof covering above.
This gives building owners a warmer, more efficient flat roof and a sealed underside that resists condensation on the cold deck. Energy use drops, internal comfort improves, and the upgrade is achieved from inside the building, avoiding the cost and weather risk of recovering the roof from above.
Self-bonds to the flat deck soffit with no board joints or fixings to cold-bridge.
Upgrades thermal performance from inside the building, without recovering the flat roof from above.
Continuous adhered layer eliminates the gaps and fixings that drain heat from cold flat decks.
Keeps the cold deck soffit sealed and above dew point to prevent interstitial damp forming.
Hugs beams, services and upstands, sealing the awkward junctions rigid boards struggle to fit around.
Ideal where limited headroom and budget rule out a full warm-roof rebuild from the top.
Sprayed in-situ, the foam follows every upstand and penetration for a continuous insulated layer with no joints.
Applied to the flat-deck soffit, the closed-cell foam self-bonds into a fully adhered, joint-free insulating layer with no fixings to create cold bridges. Its low thermal conductivity lifts the roof U-value while low vapour permeability and the airtight seal keep the cold deck above dew point, controlling interstitial condensation from within.
Typical published values for Enverge Nexseal LE closed-cell foam. Full technical specification →
Every roof is different, so the system is chosen to suit: Enverge Nexseal LE closed-cell foam (λ 0.027 W/m·K) where an integral vapour barrier and rigidity are needed, or Sucraseal open-cell (λ 0.039 W/m·K) where breathability matters. Condensation risk is assessed in line with BS 5250:2021 before any foam is applied — the discipline that separates a specialist commercial install from a generic one.
Applied to the underside of the deck, the foam seals every gap, junction and penetration in one continuous pass, helping the roof meet Part L upgrade targets without giving up internal space. Handover includes the full specification and a 25-year manufacturer-backed product warranty.
Dedicated local pages for every major city — and we cover the towns and villages between them.
Tell us about your flat roofs & building.
Free survey of your flat roofs & condensation check.
The right system for your flat roofs.
Approved applicators, minimal disruption.
Handover pack & 25-year warranty.
Underside of a car-park deck sealed and insulated in-situ.
Concrete soffit spray foam eliminating cold-bridging.
Cavity-filling spray foam for an airtight commercial partition.
Send us your building details and our technical team will specify the right system and a clear budget. No obligation.
Yes. Closed-cell foam sprayed to the underside soffit self-bonds into a continuous insulating layer, upgrading the roof from within. This avoids stripping and recovering the waterproof membrane and removes the weather risk of working from above.
No, it does the opposite. The airtight, low-permeability foam keeps the cold deck soffit sealed and above dew point, controlling the interstitial condensation that often forms on poorly insulated flat decks. We assess each build-up at survey.
Usually not. Because the foam is applied internally to the soffit, the existing waterproof covering above can typically stay in place, making this a faster, lower-disruption upgrade for occupied commercial buildings.
The foam is sprayed continuously and self-bonds around beams, ducts, pipe penetrations and parapet upstands, sealing the awkward junctions where rigid boards inevitably leave gaps, voids and cold bridges that waste heat.
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, providing documented, independent assurance for commercial flat-roof specifications and sign-off.
It depends on the build-up: Nexseal LE closed-cell brings an integral vapour barrier and rigidity; Sucraseal open-cell offers breathability and acoustic absorption. We confirm the right system after the survey.
Yes — the build-up is checked against BS 5250:2021 so the roof performs correctly through the seasons, not just on day one.
Spray foam's continuous, airtight layer is an efficient way to reach Part L upgrade targets, and we document the installed specification for Building Control.
Specialist commercial spray foam, installed UK-wide by the Duratite Group's spray foam specialists.
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