Professional Spray Foam Insulation

Spray foam insulation is a two-component liquid system that expands on contact to create a seamless, fully bonded thermal layer. It adheres directly to substrates including metal, timber, concrete and masonry without mechanical fixings. Closed-cell foam (Nexseal LE) provides thermal insulation plus vapour control, while open-cell foam (Sucraseal) offers breathable insulation with excellent acoustic properties.

Commercial spray foam insulation across the UK. Warehouses, industrial units, hangars, soffits, swimming pools, marine, agricultural and large-scale retrofit. We are not a residential loft installer.

Closed-cell spray foam (Nexseal LE, λ = 0.027 W/m·K) is denser, provides higher thermal resistance per mm, acts as its own vapour barrier, and adds structural rigidity. Open-cell spray foam (Sucraseal, λ = 0.039 W/m·K) is lighter, more cost-effective, offers superior acoustic absorption, and is breathable — ideal for timber-framed applications where moisture movement needs to be managed.

Yes for domestic buildings, and the scope matters. Our group company ThermoHoldings Limited holds BBA Agrément Certificate 23/6963 (ThermoFoam Nexseal 2.0, closed cell) and 23/6845 (ThermoFoam Sucraseal 0.5, open cell), covering pitched roofs with LR and HR underlays, external walls and suspended floors in new and existing domestic buildings — the assessment a lender, warranty provider or LABC surveyor asks for on a house. Those certificates are domestic in scope, so they are not what we lead with on the commercial and industrial work this page covers. There the evidence is the manufacturer’s declared values tested to BS EN 14315-1, BS EN 12086 and BS EN 1602, BS 476 Part 7 Class 1 fire performance when coated with DC315, and a manufacturer-backed product warranty. Tell us at enquiry what your specification demands and we will send the exact certificate or test report that answers it. Every installation is carried out by Duratite-trained installers with full documentation including thickness verification, site photographs and warranty paperwork.

Our primary closed-cell product is Nexseal LE — thermal conductivity 0.027 W/m·K. For specific applications we also use Sucraseal (open-cell), ProFill injection foam, ToughFoam high-density foam, and DC315 intumescent coating where fire-rating is required.

Yes. Closed-cell spray foam raises internal surface temperatures above dew point, eliminating the cold face where condensation forms. It also acts as a vapour barrier, preventing moisture migration through the building envelope. This makes it the ideal solution for metal-clad buildings, shipping containers, and swimming pool enclosures where condensation is a chronic problem.

Yes — closed-cell foam is ideal for steel-frame industrial buildings. It bonds direct to the underside of profiled metal decks, eliminates cold bridging, stops interstitial condensation, and adds significant racking-bracing rigidity.

Spray foam delivers a continuous air-tight seal in one pass — no gaps, no joints, no cold bridges. Rigid board needs perfect fit and taped joints; mineral wool slumps and absorbs moisture. For irregular profiles, spray foam is the only system that bonds directly without timber battens.

Spray foam achieves BS 476 Part 7 Class 1 surface spread of flame when overcoated with an intumescent thermal barrier (DC315) where the regulations require it. We always specify the appropriate fire treatment as part of the design package, in line with Approved Document B.

Costs vary by application and thickness. Closed-cell Nexseal LE typically costs £20–50 per m² fully installed depending on depth and access. Open-cell Sucraseal is more cost-effective at £15–35 per m² fully installed. Indicatively, commercial warehouse roof applications run £25–£55/m² fully installed. A typical agricultural building or warehouse can be insulated in 1–3 days. Contact Duratite for a free, no-obligation quote tailored to your project.

Nexseal LE is supplied with up to a 25-year manufacturer-backed product warranty. Workmanship is covered separately by the approved installer. We provide a single combined certificate at handover.

Yes — Duratite operates a UK-wide network of approved commercial installers covering England, Scotland, Wales and Northern Ireland. Based in Bodmin, Cornwall, we handle everything from small conversions to large-scale commercial and agricultural installations. You deal with one company; we deploy the right approved team to your site.

Survey requests are responded to within one working day. Most surveys are carried out within 5–10 working days. Once approved, install lead times typically run 2–6 weeks.

In most cases, no. Installers work nights, weekends and around shutdowns. Spray foam cures within hours, has low odour after 24 hours, and zones can be returned to service the next working day. Full RAMS, COSHH and CDM-compliant working.

Yes. Every project includes the manufacturer’s declared performance data for the foam, U-value calculations, condensation risk analysis, photographs, batch IDs, and a signed installation certificate. These satisfy Building Control sign-off, EPC requirements, and contribute to BREEAM Mat / Ene credits.

Use the survey form below or call 01208 832 602. We will respond within one working day, arrange a free site survey, and produce a fully specified quotation with thermal modelling, fire compliance, programme and warranty.