Building Envelope Trisomet®


Optimum performance for water drainage, strength and walk ability

Trisomet® is an insulated panel manufactured in the UK for both roof and wall cladding applications and third party validated for high standards of quality, thermal performance, fire safety, acoustic performance, air-tightness, water penetration and environmental credentials. The wide spaced trapezoidal steel external skin, provides optimum performance for water drainage, strength and walk ability.

As a one-fix component, in panel lengths from 300mm to 20m, the precision and consistency of our panel manufacturing process enables fast construction of your building envelope. It is available in 40mm, 60mm, 80mm, 100mm, 120mm and 135mm insulation thicknesses to meet U-values down to 0.15W/m2K, and allowing optimisation of your design solution.

As a roofing product, Trisomet® allows easy installation of photovoltaic (PVs). Scheme specific specifications and funding options can be discussed using PV panels from Tata Power, call us for further details.

To download our BIM objects for this product group, please click on the “Download BIM Objects” tab below.

Independent product verification for risk free specification

  • Approved to FM Class 4880, 4881 and 4471 to an unlimited wall height.
  • LPCB (Loss Prevention Certification Board) approval to LPS 1181 Part 1 to help reduce insurance premiums and assures reaction to fire performance.
  • Fire resistance performance of up to 30 minutes insulation and 4 hours integrity achievable with standard fixing and sealing methods (external side-lap stitched at maximum 300 mm centres).
  • Manufactured in factory conditions operating to quality management standard BS EN ISO 9001:2015, environmental management standard BS EN ISO 14001: 2015 and occupational health and safety management scheme BS EN ISO 18001:2007.
  • Product specification and performance in accordance with BS EN 14509, European Product Standard for CE Marking.
  • Full traceability of all component materials and certified ‘very good’ to BRE’s responsible sourcing standard BES 6001.

Performance guaranteed

  • Available with Platinum® Plus system guarantee of up to 30 years, covering a pre-approved range of reputable, high-end components.
  • Colorcoat HPS200 Ultra® or Colorcoat Prisma® pre-finished steel is used as standard, offering long-term performance with the Confidex® Guarantee and providing peace of mind for up to 40 years.
Thickness, t (mm) 40, 60, 80, 100, 120 and 135
Maximum length (mm)* 20000
Minimum length (mm) 300
Cutback (mm)**  
Minimum 25
Maximum 250***

* The panel length is measured by the length of the external sheet, as shown above. Lengths over 14,000mm will be subject to additional delivery charges.

** Panels will always have one flush end and one cutback end; therefore they will be handed and should be ordered according to the direction of lay required.

*** Recommended end laps are 50mm for horizontal, 100mm for vertical and 150mm for roof applications.

Weight (based on thickness mm)(kg/m2)
40 9.23
60 10.01
80 10.40
100 11.22
120 12.03
135 12.76

Platinum® Plus provides a complete building envelope solution guaranteed for up to 30 years. Designed in collaboration with our innovative supply chain of leading component manufacturers, our comprehensive portfolios of high quality products are fully integrated to provide the widest range of roofing and cladding systems.

The Platinum® Plus system guarantee includes, amongst others, the following components:

The guarantee is offered directly to building owners, giving a direct link back to Tata Steel as the one point of contact.

For full details of our approved components please contact our technical team on +44 (0) 1244 892199.

To ensure that the building envelope will perform as required by the client, we work with specifiers to tailor a specification that considers the interactions of the components and how they impact the building design and performance. We will then provide a detailed Platinum® Plus specification for use within the project tender package, together with a list of recommended installation contractors.

To guarantee the quality of components used on your building, our team of technical construction experts will visit the site to check for compliance to specification, reducing the risk of any issues arising in the future. Once the project is completed the installer will be required to apply for the guarantee using the supplied forms included in the specification document. Tata Steel will then issue the Platinum® Plus guarantee directly to the building owner.

How to raise a specification?
The Platinum® Plus system guarantee needs to be registered with the specifier prior to the tender package being distributed. Please contact our technical team so that we can help you to guarantee the longevity of your building on +44 (0) 1244 892199.

Thermal performance
Trisomet® complies with the minimum requirements of the conservation of fuel and power sections of the Building Regulations for England and Wales (Part L2) and Scotland (Technical Handbook Section 6 Energy). The panel construction offers highly consistent insulation performance, and the site-formed junctions provide a practical and effective method of ensuring good thermal performance.

Thickness (mm)U-value (W/m2K)*Typical application
40 0.46 Unheated building
60 0.33 Min Part L requirement for wall
80 0.25 Min Part L requirement for roof
100 0.20 Enhanced
120 0.16 Enhanced
135 0.15 Enhanced

* Figures computer modelled in accordance with EN ISO 10211 as stated in MCRMA Technical Note 14.

Fire Safety
Trisomet® carries Grade EXT-B and EXT-A approval by the LPCB. Also fire resistance performance of 4 hours integrity and 22 mins insulation are achievable with 40mm and 60mm core panels and 30mins insulation for panels 80mm and above. These are attained using standard fixing and sealing methods (external side-lap stitched at maximum 300mm centres).

The panel achieves a Grade AA rating in accordance with BS 476-3, which tests for external surface spread of flame and fire penetration (AA is the best result achievable). The internal surface of the panel complies with Class ‘O’ in accordance with the Building Regulations when tested to BS 476 Parts 6 & 7 and also achieves a Class B s2 rating in accordance with EN 13501-1.

The acoustic performance of Trisomet® has been predicted using software developed by the Department of Applied Acoustics, University of Salford, under a research contract funded by the Metal Cladding and Roofing Manufacturers Association (MCRMA). The results in the table are based on an 80mm core.

Frequency (Hz)SRI Values (dB)*Frequency (Hz)SRI Values (dB)*
100 12.1 800 27.2
125 13.6 1,000 28.9
160 15.3 1,250 30.6
200 16.9 1,600 32.5
250 18.5 2,000 34.3
315 20.2 2,500 36
400 21.9 3,150 35.9
500 23.6 4,000 33.8
630 25.4 5,000 31.2

Weighted S.R.I RW = 28.5 dB

* The predicted sound reduction index values should only be used to provide guidance for preliminary design and/or appraisal of cladding systems.

Our dedicated building envelope technical team are available to provide support and advice on the best product for your project. They are on hand to help with:

  • Detail design.
  • Wind loading calculations.
  • U-value calculations.
  • Load span checks.
  • Acoustic SRI predictions.
  • Specification writing.
  • Advice on meeting Building Regulations, maximising BREEAM credits.
  • Assistance with SBEM.
  • Condensation risk analysis.
  • Assistance in product testing.

Inhouse CPD seminars - Primarily aimed at engineers and architects, these free seminars last around 50 minutes, ending with a question & answer session and are delivered by our experienced regional teams. Topics include:

  • Structural roof deck in construction
  • Composite floor deck in construction
  • Sustainable steel cladding refurbishment solutions
  • Factory tour of Insulated panel lines

To request a CPD seminar please click here.

Trisomet Wall System
Trisomet Roof System


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