How Much Does Spray Foam Insulation Cost?
Commercial spray foam insulation in Ireland is priced per project rather than from a fixed rate card. The final figure depends on the type of foam, the thickness needed to reach your thermal target, the complexity of the application and site access, which is why Duratite issues a fixed quote after a free site survey. This guide focuses exclusively on commercial and industrial applications — not residential loft insulation, which is a different market with different pricing structures.
The two main products used in commercial spray foam insulation across Ireland and Northern Ireland are closed-cell foam (such as Nexseal LE, with a thermal conductivity of 0.027 W/mK, tested to I.S. EN 14315-1) and open-cell foam (such as Sucraseal). Closed-cell foam costs more per square metre but delivers superior thermal performance per unit thickness, acts as a vapour barrier, and provides structural reinforcement — making it the better long-term investment for most commercial applications.
Cost Drivers by Application Type
Spray foam costs vary considerably depending on the type of building and the specific application. The table below shows the most common commercial applications in Ireland, the typical thickness and product, and what tends to push the price up or down on each.
| Application | Typical Thickness | Product | What Affects Price Most |
|---|---|---|---|
| Shipping container insulation | 35–50mm | Nexseal LE (closed cell) | Corrugated profile, number of containers, fire coating |
| Metal building / warehouse | 40–80mm | Nexseal LE (closed cell) | Area, working height, access equipment |
| Agricultural building / barn | 35–60mm | Nexseal LE or Sucraseal | Surface cleaning, dust, working around livestock |
| Corrugated roof underside | 40–60mm | Nexseal LE (closed cell) | Roof height, purlin layout, condition of sheets |
| Swimming pool hall | 50–80mm | Nexseal LE (closed cell) | Scaffolding, humidity control, fire coating |
| Cold store / cold room | 60–100mm | Nexseal LE (closed cell) | Thickness, shutdown period, hygiene finish |
| Concrete soffit | 40–70mm | Nexseal LE (closed cell) | Access, fire protection requirement |
| Stud wall (commercial) | 50–100mm | Sucraseal (open cell) | Stud depth, linings, programme |
| Aircraft hangar | 40–60mm | Nexseal LE (closed cell) | Working height, area, operational constraints |
Every quotation covers both material supply and professional installation by a Duratite-approved installer. Preparatory work (such as surface cleaning, removal of existing insulation, or access equipment hire) is identified at survey and itemised separately based on site-specific requirements.
Closed Cell vs Open Cell: Price Comparison
Understanding the price difference between closed-cell and open-cell spray foam requires looking beyond the per-square-metre cost. Closed-cell foam (Nexseal LE) costs approximately 40–60% more than open-cell foam (Sucraseal) per square metre at equivalent thickness, but delivers nearly twice the thermal resistance per unit thickness.
| Property | Nexseal LE (Closed Cell) | Sucraseal (Open Cell) |
|---|---|---|
| Thermal conductivity | 0.027 W/mK | 0.035–0.038 W/mK |
| Relative cost at equal thickness | Higher (roughly 40–60% more) | Lower |
| Vapour barrier | Yes (integral) | No (requires separate VCL) |
| Structural reinforcement | Yes | No |
| Condensation control | Excellent | Good (with VCL) |
| Independently tested | Yes — I.S. EN 14315-1 | Application-specific |
| Thickness for the same U-value | Thinner | Roughly a third thicker |
When you factor in the thinner application required for equivalent thermal performance, the integral vapour barrier (eliminating the cost of a separate vapour control layer), and the structural reinforcement that closed-cell foam provides, the real-world cost difference narrows considerably. For condensation-prone environments — metal buildings, swimming pools, cold stores — closed-cell is not just the better-performing option but often the more economical one when total installed system cost is considered.
Factors That Affect Spray Foam Cost
Several factors influence the final cost of a commercial spray foam insulation project. Understanding these helps you anticipate pricing and ensures you are comparing quotes on a like-for-like basis.
Application Area and Volume
Larger projects benefit from economies of scale. A 200m² shipping container conversion will cost more per square metre than a 2,000m² warehouse simply because the mobilisation costs (equipment transport, setup, crew travel) are spread across a larger area. For very large projects above 5,000m², prices can drop by 15–25% compared to small projects.
Thickness and U-Value Requirements
In the Republic of Ireland, Part L of the Building Regulations sets U-value limits through Technical Guidance Document L 2022. For new buildings other than dwellings, walls must achieve an area-weighted average of 0.21 W/m²K and flat roofs 0.20 W/m²K; for material alterations and renovation the wall limit is 0.35 W/m²K. As a simple guide, thermal resistance equals thickness divided by conductivity (R = d/λ), so every 27mm of Nexseal LE (lambda 0.027 W/mK) adds about 1.0 m²K/W. Greater thickness means more material and more passes, directly increasing cost.
Access and Site Complexity
Working at height, confined spaces, complex geometries (such as the corrugated interior of a shipping container or the curved profile of a Quonset hut), and the need for access equipment all add to the installation cost. A straightforward warehouse wall sprayed from a scissor lift is significantly cheaper per square metre than the underside of a swimming pool hall ceiling requiring scaffolding.
Substrate Preparation
Spray foam bonds directly to clean, sound substrates. If the surface requires cleaning, degreasing, removal of existing failed insulation, or treatment for rust or corrosion, this preparation work adds to the project cost. On new-build projects where the substrate is clean and ready, preparation costs are minimal.
Fire Protection Requirements
Where Technical Guidance Document B – Fire Safety requires the exposed foam surface to achieve a specific reaction-to-fire classification, a DC315 intumescent coating must be applied over the cured spray foam. This is an additional coat and appears as a separate line on the quotation. Not all applications require it — foam concealed behind a suitable non-combustible lining, for example, may not. Your survey report will confirm the requirement.
Geographic Location
Projects in remote locations — islands, upland farms, or sites a long way from the nearest approved installer — incur higher mobilisation costs for equipment transport and crew travel. Combining several buildings on one site into a single visit helps keep these costs down.
Get Free Advice or Book a Survey
Duratite's technical team provides free site assessments and fixed-price quotations across Ireland and Northern Ireland. No obligation.
Energy Savings and Payback
The return on investment from commercial spray foam insulation depends on the building's existing thermal performance, your energy tariff, and the heating or cooling system in use. Typical energy savings and payback periods from Duratite project data fall within these ranges:
| Building Type | Typical Payback Period | Annual Energy Savings |
|---|---|---|
| Heated warehouse | 3–5 years | 30–50% |
| Livestock building | 2–4 years | 25–40% (plus productivity gains) |
| Swimming pool hall | 2–3 years | 40–60% |
| Cold store | 2–4 years | 30–45% |
| Metal industrial unit | 3–6 years | 25–45% |
| Shipping container office | 1–3 years | 50–70% |
These figures are based on real-world data from Duratite's project portfolio; actual payback depends on your own energy prices and operating hours. For heated buildings, the payback calculation is straightforward: reduced heat loss means lower fuel consumption. For cold stores, the equation works in reverse — reduced heat gain means less refrigeration energy. In both cases, spray foam's ability to eliminate thermal bridging and provide a continuous, gap-free insulation layer delivers savings that rigid board or mineral wool installations cannot match.
Why Closed Cell Costs More but Saves More
The higher upfront cost of closed-cell spray foam (Nexseal LE) compared to open-cell foam or traditional insulation materials is justified by several factors that directly affect the total cost of ownership:
First, thermal performance per unit thickness. Nexseal LE has a thermal conductivity of 0.027 W/mK — significantly lower than open-cell foam (0.035–0.038), mineral wool (0.034–0.040), or PIR rigid board (0.022–0.025 but with thermal bridging at joints). This means less material is needed to achieve the same U-value, offsetting the higher per-litre cost.
Second, the integral vapour barrier eliminates the cost and complexity of a separate vapour control layer. In condensation-critical environments such as swimming pool halls, cold stores, and metal buildings, this single feature can remove a significant amount of additional materials and labour from the project.
Third, the seamless application eliminates the thermal bridges that occur at every joint, fixing, and edge in rigid board or batt insulation systems. Real-world studies consistently show that spray foam delivers 15–25% better thermal performance than the same nominal U-value achieved with rigid boards, because the installed performance matches the laboratory performance — there are no gaps, compressions, or misaligned joints.
Getting an Accurate Quote
Every commercial spray foam project is different, and the guidance here should be used as a starting point rather than a definitive quotation. To get an accurate, fixed-price quote for your project, Duratite recommends the following process:
1. Contact Duratite for a free site survey. Our technical team will assess your building, measure the areas to be insulated, evaluate substrate condition, determine the correct product specification (Nexseal LE or Sucraseal), and calculate the thickness required to meet your thermal performance targets and Building Regulations requirements.
2. Receive a detailed specification and quotation. Your quote will specify the exact product, thickness, coverage rate, fire protection requirements, and any preparation work needed — with a fixed total price and no hidden extras.
3. Installation by an approved installer. Duratite operates a network of trained, approved spray foam installers across Ireland and Northern Ireland. Your project will be assigned to the nearest approved installer with experience in your building type.
Email info@duratite.ie to arrange your free survey.