HomeModular Buildings Insulation

Thermal, Acoustic & Airtightness Performance for Off-Site Builds

Modular Building Insulation Specialists

From garden rooms and shipping containers to modular homes, offices, bunkers and pods — spray foam provides the precision, speed and performance that modular construction demands. Duratite’s Enverge Spray Foam systems seal every surface and void to create an air-tight, thermally robust building envelope in a fraction of the time.

Bonds to GRP, timber, OSB, steel & aluminiumAirtight envelope in restricted depthsFast, clean, factory-ready installation
Enverge Nexseal LE closed-cell spray foam applied to the underside of a steel building roof
Enverge Spray Foam SystemsPods, cabins, garden rooms & volumetric modules
0.027
Nexseal LE lambda W/m·K
0.039
Sucraseal lambda W/m·K
5
Modular formats we insulate
Hours
Typical install time — not days
Modern Modular Living

High-performance insulation for modern modular living

Modular structures often feature shallow wall depths, metal or GRP substrates, and must be stackable, portable, or off-grid-ready. Spray foam eliminates thermal bridges, prevents air leakage, and allows every millimetre of space to be optimised — vital in compact or unconventional structures where comfort and compliance must be achieved in restricted depths.

Enverge foam bonds directly to GRP, timber, OSB, ply, concrete, steel, aluminium and more — ensuring compatibility with any modular construction method, not just SIP panels.

Book a free, no-obligation site surveyMon–Fri 8am–5pm · info@duratite.ieBook a Free Survey

Why spray foam wins in modular

Lower U-values achieved with less thickness — maximising internal space
Exceptional airtightness reduces heating demand, draughts and air leakage
Sound insulation enhanced — especially with Sucraseal in partitions and pods
Zero thermal bridging — foam seals around fixings, junctions, conduits and frame irregularities
Built for All Modular Construction Types

We insulate every modular format

Garden rooms and home offices

Providing a habitable year-round climate with superior energy efficiency and acoustic privacy.

Shipping container homes and conversions

Controlling internal temperature swings and preventing condensation on steel walls and ceilings.

Welfare cabins, portable toilets, and site pods

Improving thermal performance, moisture resistance, and fast installation turnaround.

Underground bunkers and low-profile shelters

Delivering complete vapour resistance and stable thermal conditions in below-grade applications.

Volumetric flats and off-site residential modules

Ensuring air-tight, regulation-compliant insulation that holds up during transport and stacking.

Any substrate, any method

Direct bond to GRP, timber, OSB, ply, concrete, steel and aluminium — compatible with any modular construction method.

Nexseal LE and Sucraseal

Two spray foam systems for modular construction

Closed Cell

Nexseal LE

  • Thermal conductivity: 0.027 W/m·K
  • Acts as insulation and vapour barrier in one
  • Provides compressive and racking strength to support structural panels
  • Fully adhered to metal, timber, or GRP with no fixings required
  • Prevents condensation formation in cold, exposed or underground applications
  • Ideal for container interiors, floor panels, roof cassettes, and subterranean builds
Open Cell

Sucraseal

  • Thermal conductivity: 0.039 W/m·K
  • High acoustic absorption — perfect for internal partitions and noise-sensitive modules
  • Requires a separate vapour control layer (membrane or foil-backed lining)
  • Low expansion pressure for safe use in lightweight frames and tight cavities
  • Compatible with ProFill closed injection system for factory-sealed cassette walls

Sucraseal is especially suited to internal applications, providing breathable insulation for pods, studios, classrooms and utility cabins.

Fast, Clean, Factory-Ready Installation

Installed in hours — no gaps, no cold bridges, no delays

Spray foam installs in a matter of hours. Once applied, it expands rapidly to fill every void, adheres to the substrate, and cures in minutes. This removes the need for cutting boards, using fixings or taping joints.

That makes it ideal for off-site manufacture, where time is tight and precision essential. Foam remains fixed in place during transit and stacking, and does not slump or degrade over time. The result is a high-performance modular envelope that arrives ready for plug-and-play finishing.

100%of voids filled — foam expands into every gap and junction
Cures in minutesTransit & stacking stableNo boards, fixings or taping
Bonds to GRP, timber, OSB, steel & aluminiumAirtight envelope in restricted depths
Fire Protection and Compliance

Compliance for habitable spaces, designed in

Both Enverge spray foams are rated Euroclass E, and must be protected to achieve compliance for habitable spaces: lined with 12.5 mm plasterboard or non-combustible lining boards, or coated with DC315 intumescent paint achieving Euroclass B-s2,d0 classification.

This is critical for any modular structure seeking sign-off from Building Control or insurance authorities.

Duratite supports every project with tested, documented fire strategies.

Detailed film build specificationsFor DC315 intumescent coating on exposed foam.

Tested configurationsFor different substrates and build-ups.

Fire-rated detailing adviceFor pod interiors, GRP, and container linings.

Moisture and Vapour Risk Management

Moisture control is essential in enclosed modular buildings

Especially containers and underground units. Spray foam stops air ingress and regulates vapour movement — and Duratite professionally models every project using WUFI Pro and BuildDesk to ensure compliant hygrothermal performance and prevent mould growth, trapped moisture or interstitial condensation.

Nexseal LE

Acts as a built-in vapour control layer, preventing condensation risk inside cold or humid structures.

Sucraseal

Used with an appropriate smart membrane or VCL, provides a breathable solution with full moisture modelling support.

Trusted by Modular Specialists

Duratite is proud to work with

We advise on the right insulation specification, ensure compliant application, and support fire safety, acoustic and moisture strategies throughout the build.

Modular housing manufacturers

And volumetric housing providers building regulation-compliant modules at scale.

Garden room & studio builders

Construction companies delivering habitable year-round garden buildings.

Container converters

And GRP shell fabricators controlling condensation on steel and composite skins.

Shelter & bunker installers

Underground and low-profile structures needing complete vapour resistance.

Education, hospitality & healthcare pod builders

Acoustic and thermal comfort for noise-sensitive occupied pods.

Specifiers & building control

Full documentation: datasheets, fire strategy, moisture modelling and handover packs.

Downloads and Resources

Documentation for your modular project

Enverge Sucraseal DatasheetEnverge Nexseal LE DatasheetDC315 Fire Coating GuideModular Fire DetailingMoisture Modelling GuidanceDuratite CPD — Spray Foam in Modular Design

All documentation supplied with your project pack or on request — email info@duratite.ie.

Start Your Project

Talk to us about your next modular building insulation project

Whether you’re building one garden room or a production line of volumetric modules, Duratite provides the insulation specification, compliant application route and technical support to get it right first time.

Bonds to GRP, timber, OSB, steel & aluminiumAirtight envelope in restricted depthsFast, clean, factory-ready installation

Speak to the modular team

Tell us your format, substrate and target U-value — we’ll respond with the right system.

Mon–Fri 8am–5pm · info@duratite.ie

Free Site Survey

Get a Free Site Survey & Quote

Tell us about your building and we’ll recommend the right system — foam, waterproofing or both — surveyed, specified and quoted at no cost.

  • Reviewed by a Duratite specialist
  • No obligation, no hard sell
  • One team from survey to warranty
  • Ireland and Northern Ireland coverage
info@duratite.ie
No obligation · We’ll never sell your details · Typical reply within 1 working day
0 0.00
Email a Duratite expert info@duratite.ie