Kingspan TR26 Thermaroof
(11 Products)Kingspan Thermaroof TR26 LPC/FM is a rigid thermoset insulation board designed for flat roofs waterproofed with mechanically fixed single-ply membranes. It provides excellent thermal performance, durability, and compatibility across steel, timber, and concrete deck constructions, including green roof systems. With a thermal conductivity of 0.022 W/mK, it ensures high energy efficiency, ease of installation, and long-term reliability in both new build and refurbishment applications.
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Understanding Kingspan Thermaroof® TR26
Kingspan Thermaroof TR26 LPC/FM is a high-performance rigid thermoset polyisocyanurate (PIR) insulation designed for flat roofs waterproofed with mechanically fixed single-ply membranes.
The board comprises a closed-cell PIR core faced on both sides with a low-emissivity composite foil, optimised to reduce heat loss through the roof structure and improve U-value performance.
The insulation provides consistent thermal resistance, with a declared thermal conductivity of 0.022 W/mK, and is available in a range of thicknesses to meet specific U-value requirements from 0.25 W/mK down to 0.10 W/mK.
It is LPCB-approved to LPS 1181 Part 1 and FM-approved for Class 1 steel deck assemblies, confirming its fire and structural integrity under rigorous testing.
Fully compatible with most mechanically fixed single-ply waterproofing systems, TR26 LPC/FM integrates effectively with Kingspan’s Kooltherm K106 and K108 cavity insulation to ensure thermal continuity at junctions and parapets. Its low vapour permeability and resistance to water vapour passage minimise the risk of interstitial condensation.
Manufactured with a blowing agent that has zero Ozone Depletion Potential (ODP) and low Global Warming Potential (GWP), Kingspan Thermaroof TR26 LPC/FM offers an A+ Green Guide rating and is certified to BES 6001 ‘Excellent’ for responsible sourcing.
Material Range
- Kingspan Thermaroof TR26 LPC/FM: High-performance rigid PIR insulation board faced with low-emissivity composite foil, available in thicknesses from 70mm to 160mm, and suitable for single or multi-layer installation.
Key Features
- Thermal Conductivity: 0.022 W/mK providing high insulation efficiency.
- Fire Certification: LPCB-approved to LPS 1181 Part 1 and FM-approved for Class 1 steel deck assemblies.
- Compatibility: Suitable for mechanically fixed single-ply and green roof systems.
- Moisture Resistance: Resistant to the passage of water vapour.
- Installation Efficiency: Lightweight, easy to handle, and ideal for fast-track construction.
- Environmental Performance: Zero ODP, low GWP, and BRE A+ Green Guide rating.
- Responsible Sourcing: Certified to BES 6001 ‘Excellent’.
- Durability: Rigid thermoset structure maintaining dimensional stability over service life.
Typical Applications
- Mechanically Fixed Single-Ply Roofs: Used over metal, timber, or concrete decks with telescopic tube fasteners.
- Green Roof Systems: Suitable for extensive and semi-intensive green roof build-ups, providing load-bearing thermal performance beneath drainage and substrate layers.
- Warm Roof Constructions: For new builds and refurbishments where continuous insulation is required above the deck.
- Parapet and Junction Detailing: Used with Kingspan TR27 or Kooltherm K108 to maintain insulation continuity and reduce thermal bridging.
Specification & Standards
- Thermal Performance: Designed to meet U-values from 0.25 W/mK to 0.10 W/mK depending on thickness and deck type.
- Manufacturing Standards: Produced in accordance with BS 4841-4 under a management system certified to ISO 9001, ISO 14001, OHSAS 18001, and ISO 50001.
- Wind Loading: To BS EN 1991-1-4:2005 +A1:2010 (Eurocode 1).
- Flat Roof Design: Complies with BS 6229:2018 (Flat roofs with continuously supported coverings - Code of practice).
- Environmental Certification: BRE Environmental Profile ENP 500, Green Guide Rating A+.
Related Materials and Construction Uses
Kingspan Thermaroof TR26 LPC/FM integrates within flat roof systems alongside Kingspan Thermataper LPC/FM for tapered falls and Kingspan Kooltherm K106/K108 cavity boards to ensure continuity between roof and wall insulation.
It complements single-ply non-bituminous waterproofing membranes and green roof systems, offering an efficient solution for thermal bridging control and condensation prevention. TR26 is frequently used in conjunction with vapour control layers, DPCs, and plasterboard ceilings in both commercial and residential flat roofing applications.
Frequently Asked Kingspan TR26 Questions
What Applications Is TR26 LPC/FM Suitable For?
TR26 LPC/FM is suitable for flat or tapered warm roof constructions on metal, timber, or concrete decks. It is widely used in commercial, industrial, and refurbishment roofing projects requiring LPCB-approved insulation.
What Does LPC/FM Certification Mean?
LPCB (Loss Prevention Certification Board) and FM (Factory Mutual) approvals confirm that TR26 meets fire performance, quality, and durability standards for insurance compliance in industrial and commercial roofing systems.
What Thermal Performance Does TR26 Provide?
Kingspan Thermaroof TR26 typically offers a thermal conductivity of 0.022 W/mK, providing high levels of insulation with reduced board thickness to meet Building Regulations Part L U-value requirements.
How Should TR26 Boards Be Installed?
Boards are laid tightly butted with staggered joints, secured using mechanical fixings through the waterproofing membrane into the deck. Installation should follow Kingspan’s technical guidelines and relevant BS 6229 and BS 8217 standards.
Can TR26 Be Used With Single-Ply Membranes?
Yes, TR26 is compatible with mechanically fixed single-ply waterproofing systems, including PVC, TPO, and EPDM membranes, as specified by the roofing manufacturer.
Is A Vapour Control Layer Required With TR26?
A vapour control layer (VCL) is typically required beneath TR26 boards to prevent condensation within the roof structure, in accordance with BS 5250 and roof design guidance.
What Are The Standard Board Sizes For TR26?
Standard boards measure 1200mm × 1200mm, with thicknesses typically ranging from 25mm to 150mm to achieve required U-values.
What Is The Compressive Strength Of TR26?
TR26 has a typical compressive strength of 150 kPa at 10% compression, suitable for roof systems subject to maintenance traffic and light loading.
How Should TR26 Be Stored On Site?
Boards should be stored flat, off the ground, under cover, and protected from direct sunlight and moisture. Damaged or wet boards should not be installed.
