Insulate commercial and industrial pitched roofs from beneath the deck — airtight, fast and manufacturer-certified. Installed UK-wide by ThermoFoam.
Commercial pitched roofs, from warehouse units to agricultural and light-industrial buildings, often lose significant heat through the sloping deck and rafters. Traditional board or quilt insulation leaves gaps at rafters, ridges and eaves where air leaks and heat escapes, and on older buildings irregular rafter spacing makes a continuous, well-fitted insulation line almost impossible to achieve.
Enverge closed-cell spray foam is sprayed directly to the underside of the pitched deck and rafters, self-bonding as it cures to form one continuous, gap-free layer that follows every angle and junction. It seals the sloping plane and the awkward ridge and eaves details in a single pass, where rigid boards would need cutting, packing and taping.
This delivers a warm, airtight roof line that cuts heat loss, stabilises internal temperatures and reduces heating demand across large commercial volumes. The structure is also protected from condensation and the building becomes cheaper to run, more comfortable for staff, and better suited to year-round operation.
Self-bonds to the sloping deck and rafters, sealing ridge and eaves details boards cannot reach.
Forms a continuous warm-roof line that slashes the heat escaping through the pitched plane above.
Seals rafter junctions and sheet overlaps, stopping the draughts that quilt insulation always leaves behind.
Fills irregular rafter spacing on older roofs without cutting, packing or taping rigid boards.
Stabilises internal temperature, reducing the heating demand of large, tall pitched commercial volumes.
Keeps the timber or steel roof structure dry and condensation-free for the long term.
Closed-cell foam bonds to the deck and rafters, sealing the roof line completely for airtight, long-life performance.
Sprayed to the underside of the pitched deck and rafters, the closed-cell foam self-bonds to form a continuous airtight warm-roof layer following the slope. Its low thermal conductivity cuts heat loss through the sloping plane, while low vapour permeability and the seamless seal control condensation across ridge, eaves and rafter junctions.
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.
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Tell us about your pitched roofs & building.
Free survey of your pitched roofs & condensation check.
The right system for your pitched roofs.
Approved applicators, minimal disruption.
Handover pack & 25-year warranty.
Send us your building details and our technical team will specify the right system and a clear budget. No obligation.
Yes. Because the foam is sprayed and self-bonds to whatever it touches, it fills uneven rafter spacing and follows every angle, giving a continuous layer where rigid boards would leave gaps that need packing and taping.
Applied to the underside of the deck it forms a warm-roof line, bringing the rafters and structure inside the insulated envelope. This protects the timber or steel from condensation and keeps the whole roof volume thermally stable.
Yes, it is widely used on agricultural, warehouse and light-industrial pitched roofs where large spans and heat loss are an issue. It is a commercial and industrial product; we do not work on domestic dwellings.
The foam is sprayed continuously into the ridge and eaves junctions, self-bonding around the awkward geometry to seal the points where draughts and heat loss typically concentrate, all in one application without any separate trims or tapes.
The Nexseal LE closed-cell foam we install is manufacturer-certified under Agrément 09/4610 and backed by a 25-year manufacturer-backed product warranty, giving specifiers and building owners documented, independent long-term assurance for the roof.
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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