Spray foam insulation · made by AmrizeFive foams and a fire coating, from one supplier. Nexseal LE is the rigid closed-cell flagship at λ 0.027 W/m·K; Sucraseal is the breathable open-cell answer where sound matters; OnePass HFO buys back depth where there is none. Duratite supplies Enverge in Ireland — stock, specifications, trained applicators and the warranty.
Spray-applied · self-bondingSprayed as a liquid, it expands into the shape it is given and cures bonded to the substrate. Every practical advantage comes from that one property.
It grips as it cures. No fixings, no penetrations through the deck, and no rails running cold straight through the insulation line.
It fills what a board cannot be cut to fit — ribs, rafter junctions, service penetrations. The insulation and the air barrier are the same material, applied at the same time.
Nexseal LE cures rigid at 78 kPa and adds racking strength to the frame it is sprayed into, while resisting liquid water and vapour at µ 62.
Sucraseal is soft and vapour-open, with sound absorption around NRC 0.70 at 100 mm — the better answer between rooms and floors, paired with an AVCL.
Closed cell and open cell are not interchangeable. Vapour strategy, structural contribution and acoustic performance decide it — and getting that wrong is what causes problems years later.
The flagship. Rigid, low-emission closed-cell foam that self-bonds to steel, concrete and timber, resists water, and adds racking strength to the frame it is sprayed into.
Soft, low-density and water-blown, with zero ozone depletion potential. It breathes, so it needs a vapour control layer on the warm side — and it is the better answer wherever sound matters.
The best thermal performance in the range. Where you are fighting for headroom, rafter depth or a tight cavity, this is the one that buys the space back.
A pour and low-expansion system for filling what you cannot spray into open — masonry cavities, stud bays and retrofit voids — without pushing the structure apart.
A high-density closed-cell foam for agricultural buildings and uninhabited storage. It meets ASTM E-84 Class A in its own right, so for those uses it needs no separate thermal barrier over the top.
Foam in an occupied space needs a thermal barrier. DC315 is a water-based intumescent coating from International Fireproof Technology — a separate manufacturer, not part of the Enverge range — and the product we specify over Enverge foam to reach BS 476 Part 7 Class 1.
Enverge is supplied to specification, not off a shelf — thickness, vapour strategy and fire build-up are set per project, so there is no meaningful price per pail. Tell us the building and you get a written specification and a price for the complete system, free.
| System | Type | λ (W/m·K) | Density (kg/m³) | Strength / fire | Typical use |
|---|---|---|---|---|---|
| Nexseal LE | Closed cell | 0.027 | 35–47 | 78 kPa · µ 62 | Roofs, soffits, piling, structural |
| Sucraseal | Open cell | 0.039 | 12–24 | NRC ≈ 0.70 · vapour permeable | Acoustic, vapour-open build-ups |
| OnePass HFO | Closed cell | ≈ 0.020† | 30–37† | 172 kPa · > 90% closed cell | Where depth is tight |
| ProFill Closed Cell | Cavity pour | ≈ 0.023† | 30–34† | 262 kPa† | Masonry cavities |
| ProFill Open Cell | Stud & retrofit | ≈ 0.036† | 8.8† | > 90% open cell | Stud bays, retrofit voids |
| ToughFoam | High density | ≈ 0.030† | 144–176† | ASTM E-84 Class A unaided | Agricultural, uninhabited storage |
The grade most commercial specifications land on, and the one the warranty is usually written against.
This is a moisture decision before it is a thermal one. Thickness can fix a U‑value. Nothing fixes the wrong vapour behaviour in the wrong place.
Every photograph below is a completed Duratite job, not a stock image.
Nexseal LE Warehouse & industrial roofsSprayed to the underside of profiled metal. Stops condensation dripping onto stock and lifts the whole envelope in one visit. Nexseal LE Hangars & large spansBig uninterrupted roofs where boarding out would mean scaffold, fixings and weeks of programme. Nexseal LE Corrugated & profiled metalFoam takes the profile of the sheet, filling every rib — the shape boards cannot follow without packing and tape. LE + DC315 Concrete soffits & undercroftsSprayed direct onto the slab where there is no cavity and no room for a board build-up, then fire-coated where it is exposed. 
Nexseal LE Piling & below groundContiguous and sheet piling infilled with foam instead of shotcrete — lighter, faster, and insulating rather than just filling. LE or Sucraseal Flat & warm roofsClosed-cell foam as the warm-roof layer, taking falls and detailing around upstands before the waterproofing goes on. Product, area and thickness in — sets and an indicative U‑value out, with the arithmetic shown.
Indicative, for the foam layer plus standard surface resistances. Your target comes from the project’s Part L calculation, not from this table.
| Thickness | Nexseal LE · λ 0.027 | Sucraseal · λ 0.039 | OnePass · λ 0.020† |
|---|---|---|---|
| 25 mm | 0.93 W/m²K | 1.26 W/m²K | 0.71 W/m²K |
| 50 mm | 0.50 W/m²K | 0.70 W/m²K | 0.38 W/m²K |
| 75 mm | 0.34 W/m²K | 0.48 W/m²K | 0.26 W/m²K |
| 100 mm | 0.26 W/m²K | 0.37 W/m²K | 0.19 W/m²K |
| 150 mm | 0.18 W/m²K | 0.25 W/m²K | 0.13 W/m²K |
| 200 mm | 0.13 W/m²K | 0.19 W/m²K | 0.10 W/m²K |
Spray foam attracts more certification confusion than anything else we sell. Here is the position in plain terms, because getting this wrong costs people mortgages and sign-offs.
Six stages. The records taken at stage five are what the warranty rests on — not the invoice.
We measure, check the substrate and run the condensation risk before anything is specified.
A written, project-specific spec — product, thickness, vapour strategy, fire build-up. Free.
Clean, dry, sound substrate. Rooflights, services and plant masked off before anything is sprayed.
Built up in controlled passes to the specified depth by a trained applicator, following the profile of the deck.
Installation logs, depth and density checks, batch numbers and photographs. No records, no warranty.
DC315 thermal barrier where the fire strategy requires it, or a UV-stable coating where the foam is exposed.
A supply-and-fit job produces two separate documents. It matters, because they cover different things and are claimed against differently.
Covers the product — that the foam meets the specification on its Technical Data Sheet. Issued whether Duratite installed it or supplied it to your own applicator.
CRO 821494
Covers the installation — thickness, adhesion, coverage and detailing. Exists only where Duratite’s approved installer carried out the work.
Recent Duratite projects in the UK, with the products named.
Warehouse insulation — Enverge closed-cell foam sprayed to the roof underside, stopping condensation over the production floor.
Read the case studySubstation soffit in Nexseal LE, then DC315 intumescent coating over the cured foam to meet the fire strategy for the undercroft.
Read the case studySheet piling infilled and faced with closed-cell foam instead of shotcrete — lighter, faster, and insulating rather than just filling.
Read the case studyAnyone can sell you foam. The parts that decide whether the job is right are the parts around it.
Open cell or closed cell is a moisture decision, not a warmth decision, and it is the one that cannot be corrected later by adding thickness.
Product, thickness, vapour strategy and fire build-up, project-specific and in writing — before you commit to anything.
Delivery across Ireland — lead time confirmed when you order — with the data sheets and safety data, so the paperwork arrives with the material.
Trained and audited by Duratite. Foam is unforgiving of bad application, and the warranty depends on how it went on.
DC315 over cured foam, specified to film thickness against your building’s fire strategy rather than left for you to work out.
Material from Building Products, workmanship from Projects — never blurred into one document, and never insurance-backed.
Everything on this page, sourced. Free, no email required.
The ten questions specifiers and contractors actually ask us.
Send the build-up, the areas and the U‑value you have to hit. You’ll get a written specification back — product, thickness, vapour strategy and fire build-up — free, before you commit to anything.
Free survey and fixed written specification in every county, installed through our approved installer network. Choose your area.
Tell us about your building and we’ll recommend the right system — foam, waterproofing or both — surveyed, specified and quoted at no cost.
