At a glance

Hemsec External Micro Rib Metal Faced Insulated Panels
Hemsec External helps create more usable space in a building, whilst providing insulation and fire resistance.

  • Designed with exceptional inherent strength which reduces the need for secondary supporting steelwork.
  • Lightweight, factory engineered and fire resistant.
  • Improves the appearance of a building.
  • Full thickness range from 50mm (U value of 0.39) to 200mm (U value of 0.10).


Hemsec Control panels are ideally suited for use in your internal refurbishment projects and for forming multiple suites of rooms. As the thinnest panels in our range they are not only the most cost effective solution but offer fantastic thermal performance alongside unrivalled wall and ceiling spans.

Our 50mm thick panels are especially suited for use as lining walls replacing the likes of PVC single skin products, avoiding unsighlty joins and supporting frameworks resulting in a clean, attractive and aesthetically pleasing finish.

These temperature controlled solutions are typically used within the food and drink industry, for applications such as:

  • Chilled Storage.
  • Food Processing and Preperation.
  • Storage and Warehousing.
  • Retail solutions.


We aim to provide you with easy to follow and relevant technical information, suited to the vast majority of applications. 
Whilst we are confident the below data will help you specify, design and build your project using our Hemsec External panels, we always encourage further conversations around your project specific requirements. This can make the most of our panels capabilities, allowing us to tailor our technical details with a project specific guarantee. Its good to talk during the early stages of your project…

Panel Data

Panel Thickness
Min. Panel Length
Thermal Transmittance
U W/M2K *
Weight Kg/m2

* Thermal transmittance based on a mean thermal conductivity value of 0.02038 W/mK.

Span Data:

Panel Thickness
Wall Span L in metres **
UDL (kN/m2) *

* Pressure/Suction load type.

** Spans specified are not necessarily as per fire test conditions. Refer to the Hemsec Fire Rating Matrix document for further detail, available to download from our website.

All spans are based on single span conditions with 0.5mm internal and external steel faces.
Shaded cells denote dark coloured steels, un-shaded denote light coloured steels.***
Span lengths vary between dark & light colours due to differing UV absorption/reflectivity on the panel face giving varying deflection criteria (see below for Surface Temperature Conditions used in calculations).

*** Please refer to the ECCS document European Recommendations for the Determination of Loads and Actions on Sandwich Panels No136 2015 for examples of temperature loads. This document shows the likely maximum surface temperatures specific colours can have with the full effect of the sunlight. Please also refer to BS EN 14509:2013 page 132 for further details.

Surface Temperature Conditions:
Light coloured steels RG = 40-74 T outside face = +65°C
Dark coloured steels RG = 8-39 T outside face = +80°C
(Where RG is the degree of reflection relative to magnesium oxide = 100%)


Table Data Based Upon:

1. Values have been calculated in accordance with BS EN 14509 : 2013 self-supporting double skin metal faced insulation panels.

Also in accordance with European recommendations for design of composite sandwich panels ECCS Doc 115 : 2001.


2. The following deflection limits have been used. Pressure and Suction L/100.

3. Sufficient numbers of fasteners (through fixed) are required to secure panels to the structural frame. Typically 3 no. per panel end and at purlin/primary steel positions as quantified by a structural engineer.


4. The minimum bearing width on panel ends to be 100mm per end, please consult Hemsec for bearing widths less than this.


5. Wind loads are working loads (unfactored).

Cover Width:


Insulation Core:

A rigid thermoset polyurethane insulation core, provides the following benefits:

  • Closed cell.
  • HCFC free.
  • Zero ozone depletion potential (ODP).

Panel Joint:

Tongue and groove panel joint achieves excellent vapour resistance and thermal performance.


Steel Facing Options:

Panel FinishesManufacturer *Internal
Steel Substrate
Paint Thickness
µm (nominal)
Laminate Thickness
µm (nominal)
Plastisol Thickness
µm (nominal)
UltraColorcoat HPS200 Ultra®
by Tata Steel
0.5mm Galvalloy--200
PrismaColorcoat Prisma®
by Tata Steel
0.5mm Galvalloy50--
Colorcoat LGColorcoat®
by Tata Steel
0.5mm Z275 HDG--200
PolyesterVarious0.5mm Z225 HDG25--
Primer / LinerVarious0.5mm Z225 HDG7--

* Other branded options are available.

External Steel Facing:

  • Micro Rib (as standard).
  • Smooth (on request only).

Internal Steel Facing:

  • 100 Rib.
  • Smooth.


Air Leakage:

Panel joint air-tightness = 0.01 m3/m2/hr at 50 Pa when tested to EN 12114 in accordance with BS EN 14509: 2013.


All panels have a predicted figure weighted sound reduction Rw = 26dB.


Reaction to fire:

Polyester coated PIR sandwich panels have a performance in accordance with EN13501-1:2007 + A1:2009 of B s2 d0.
Plastisol coated PIR sandwich panels have a performance in accordance with EN13501-1:2007 + A1:2009 of C s3 d0.

For fire specification on other panel finishes please contact Hemsec.

Fire resistance:
LPCB LPS 1181 Part 1 Cert:558b

100-175mm external wall thicknesses achieve EXT-A30 with 60 minutes integrity and 30 minutes insulation.
Maximum unsupported span 4m (walls). For detailed information visit the Red Book Live website.

BS EN 13501-2: 2016

Please refer to the Hemsec Fire Rating Matrix document for further detail relating to direct field of application.

For further fire related information, please refer to the Hemsec ‘Fire Rating Matrix’ document, as per the above link.

Quality & Durability:

Hemsec metal faced panels are manufactured from high quality materials, using state of the art production equipment to rigorous quality control standards (complying with an approved BS EN ISO 9001:2015 QMS standard) ensuring long-term durability and service life.


Hemsec Manufacturing Ltd offers a 25 year panel performance guarantee.
This is subject to project specific information. Please contact Hemsec for further details.



Gain the exact finish you need, by including flashings in your Hemsec orders.

  • Manufactured to match all your technical specifications.
  • The same steel coil is used to match your flashings to the panels produced on our production line.
  • Various designs, folded to a maximum length of 3000mm.
  • Available with safety folds (excluding galvanised and five-bar aluminium)


Hemsec will always strive to push the limitations of our product range. We do this by testing them more thoroughly than even the most rigorous accreditation requires us to do so; underpinning our promise of quality.

The technical specifications outlined above were delivered from successful demonstrations, performed to the test standards set out by our accreditation suppliers. You can relax knowing that the business risks associated with key projects are reduced by us working directly with these bodies:

  • Loss Prevention Certification Board (LPCB)
  • Factory Mutual (FM Approval)
  • BS EN Standards
  • Conformité Européenne (CE Marking)


The below files are specifically tailored to our Hemsec External metal faced product. If you can not find the information you require for this product please contact us. If you are looking to find more generic company information or another products data please browse our download section…

Hemsec External panels in cream used to construct a modular school building

External Data Sheet

January 2020 – A

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Metal Faced Ceiling Care

March 2019 – A

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Steel Matrix

March 2019 – A

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Metal Faced Panel Care

March 2019 – A

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Metal Faced COSHH

March 2019 – A

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LPCB LPS 1181 Certificate

July 2018 – A

Hemsec leading in insulated panel manufacture product overview brochure front page preview

Hemsec Product Overview Brochure

December 2019 – A

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ISO 9001 : 2015 Certificate

August 2018 – A

Hemsec a trusted partner overview brochure front page preview

Hemsec Overview Brochure

March 2019 – A

Metal Faced Sustainability

March 2019 – A

Case Studies

We love that our products make a difference, there’s nothing better than setting our eyes on a finished project and hearing the story behind it.
Here are some of our most recent External product case studies, hopefully they may provide some inspiration for your next project and an insight in to our products capabilities and uses. Think your project would compliment our list? Why not send us some details…


Hemsec are producing the most relevant educational information to make your life easier.
Be you an architect, developer or installer, we can help ease you through the learning curve of our products and advance your knowledge to assist you in your day to day processes. Is there a particular topic on your mind right now? Let us know..



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