At a glance

Hemsec SIPs Timber Faced structural insulated panel with mini sip spline
Construct better quality buildings, and build them faster, using Hemsec SIPs. Central to the development of many Modern Methods of Construction (MMC).

  • CE and BBA Certified product, extensively tested for Structural, Acoustic and Thermal properties, including Fire Resistance.
  • Easily integrated with a wide range of construction materials as a load or non-load bearing structure.
  • Combined structure and insulation reduces wall thicknesses, maximising internal build space without compromise.


You can use Hemsec SIPs for all internal and external walls and roofs in domestic, industrial and commercial construction. You can manufacture an entire building using SIPs for walls, floors and roofs.

Hemsec SIPs are the best solution for applications where you need thermal efficiency. Depending on how they are used, a building manufactured using SIPs can out-perform most Passive House measures for low-energy use.

Hemsec SIPs are ideal for the following applications:

  • Housing
  • Education
  • Hotel and Leisure
  • Retail
  • Commercial and industrial


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 SIPs, 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

Cover Width:


Dimensions & Weight:

Panel Thickness (mm)Internal OSB/3
Foam Core
External OSB/3
Weight (kg/m2)

Thermal Performance:

Panel Thickness
Thermal transmittance
(U-value) W/m2K

Calculated using the method required by the Building Regulations Part L2 (England & Wales) and Building Standards Part J (Scotland). Also calculated in accordance with BS EN ISO 6946:1997 and BRE report (BR443:2006)>/p>

Foam Core Thickness
Declared Thermal Conductivity
λ D (W/mK)
70 to 800.030
≥80 to <1200.029

Product Tolerances:

-3mm-3mm-3mmmaximum 2mm variance

Insulation Core:

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

  • Closed cell.
  • CFC & HCFC free.
  • <5 value for global warming potential (GWP).
  • Zero ozone depletion potential (ODP).


OSB Panel Facings:

The SIPs panel comprises of BBA Approved 15mm Internal and 15mm External Oriented Strand Board (OSB) grade 3 facings. OSB/3 has a thermal conductivity value λ of 0.13 W/mK.
Manufactured to specification EN 13986 and EN 300:2006, OSB/3 comprises of strands of softwood bonded together using a formaldehyde free synthetic resin.
The OSB boards are responsibly sourced and comply to FSC and PEFC chain of custody requirements. Further information and Certification can be obtained on request.


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.


Please refer to Hemsec SIPs BBA certificate, Section 12 – Resistance to Airborne Sound.


Panel Internal and External OSB and CPB facings have Class 3 surface spread of flame to BS476: Part 7: 1987.
When Hemsec SIPs are used as part of a through-wall build up they pass the requirements of BS476 Part 21 fire resistance of load bearing walls and have achieved up to 75 minutes fire rating. Non-Load bearing walls can achieve up to a 90 minute fire rating (BS476 Part 22:1987).


Loading Capacity Walls: Hemsec SIPs 125mm Wall panel. The permissible design load values for the effective span of the panels based on the results of tests undertaken and analysed in accordance with BS5268-2:2002.

Loading Capacity Roofs: Hemsec SIPs 175mm Roof panel. The permissible design load values for the effective span of the panels based on the results of tests undertaken and analysed in accordance with BS5268-2:2002.

For further technical information please refer to our BBA certificate or contact Hemsec.

Quality & Durability:

Hemsec SIPs are manufactured from the highest quality materials, using state of the art production equipment to rigorous quality control standards, complying with ISO9001:2008 standard, ensuring long-term reliability and service life.

The panels will have comparable durability to that of OSB/3 to BS EN 300 : 2006, therefore, provided the installation remains weathertight and damp-proof; a life of at least 60 years may be expected.

The long life expectancy of our product will reduce energy consumption of a building over its’ lifespan.

Guarantees & Warranties:

Warranties for SIPs construction are available from companies that offer warranty schemes and the majority of lenders are able to offer mortgages on SIPs houses. Hemsec SIPs are BBA / NHBC approved and are eligible for Premier Guarantee.



Optional 50mm rebates can be formed in our panels during manufacture, applied to all 4 edges.


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)
  • British Board of Agrément (BBA)
  • BS EN Standards
  • Conformité Européenne (CE Marking)


The below files are specifically tailored to our Hemsec SIPs timber 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…

SIPs panels forming the first floor on a residential property

SIPs 11mm Data Sheet

March 2019 – A

Hemsec SIPs structural insulated panels used on a self build property in scotland finished in white render

SIPs 15mm Data Sheet

March 2019 – A

Hemsec composite insulated panel manufacturer alternative placeholder image

Timber Faced Panel Care

March 2019 – A

Hemsec composite insulated panel manufacturer alternative placeholder image

SIPs ETA Certificate

June 2017 – A

Hemsec composite insulated panel manufacturer alternative placeholder image

SIPs CE Certificate

August 2017 – A

Hemsec composite insulated panel manufacturer alternative placeholder image

SIPs BBA Certificate

October 2014 – A

Hemsec composite insulated panel manufacturer alternative placeholder image

ISO 9001 : 2015 Certificate

August 2018 – A

Hemsec a trusted partner overview brochure front page preview

Hemsec Overview Brochure

March 2019 – A

Timber 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 SIPs 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…



How To.

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