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Jabroof Board


Key Features of Jabroof Classic Board

  • Permanent insulation for the lifetime of the building
  • Lightweight
  • Easy to handle
  • Can be cut to fit with a sharp knife
  • Rot proof and durable
  • Manufactured from EPS (expanded polystyrene)
  • EPS has an A+ rating in the BRE Green Guide to Specification
  • Can be used on timber, concrete, metal or woodwool decks
  • Product is available with a foil face if requried

Ordering Jabroof Classic Board

Jabroof Classic Board is supplied as EPS 100E and 150E as defined in BS EN 13163. Other densities are available on request.

Standard size is 2400 x 1200mm, 1200 x 1200mm and 1200 x 900mm.

Thicknesses are available from 20mm to 600mm in 5mm increments.

Angle fillets are also available to facilitate the laying of roofing material (1200 x 75 x 75mm in either EPS 100E or EPS 150E)

Download BBA certificate

Relevant Applications View our Case Study

Jablite Board is used to insulate warm-deck flat-roof construction with single-ply membrane weatherproofing.

Jabroof Premium and Classic board are used to insulate new and existing pitched roofs.  They can be used to upgrade the performance of roofs to meet current Regulatory standards and are often installed with 12.5mm thick plasterboard to provide insulation and a ceiling finish to the underside of a pitched roof.


The National Maritime Museum welcomes over 1.5 m visitors a year and is part of the UNESCO Maritime Greenwich World Heritage Site.  The major new extension, named the Sammy Ofer Wing, has been made possible thanks to a massive £20m donation by shipping magnate and philanthropist Sammy Ofer, who served with the Royal Navy in WWII.

The design of the extension includes a new entrance, new exhibition spaces and new visitor and study facilities.  It is on track for opening in 2011 and is expected to achieve a BREEAM ‘Very Good’ rating for sustainable design, with Jablite insulation products playing a key role in delivering that.

The main contractor Bovis Lend Lease, responsible for designing the package that would provide the waterproofing and insulation, appointed Rock Complete Waterproofing to undertake the work.

Managing Director, John Walsh, who served with the Royal Navy for ten years, had a very personal reason for being particularly pleased to be involved in this prestigious project: “As an ex Naval Serviceman, the fact that that we will be providing watertight integrity to this building, which is to protect the display of Nelson’s uniform brings home the importance of the task.”

Rock has the technical expertise and immense experience to take on this kind of high profile project. John Walsh explains exactly what the challenges were: “The main issues for the roof were twofold.

“Firstly to provide a watertight system that was sufficiently robust to provide peace of mind to the clients and an overall build up that could accommodate drainage whilst maintaining the architect’s desire for a continuous stone slab finish.

“The only truly robust system which could meet the criteria laid down was Rock’s own Flexiphalte triple protection system and this was instantly recognised by the Client and main contractor alike.”

The next choice was the insulation to the warm roof area, which had to achieve a U value of 0.15 and to demonstrate extreme longevity when buried. This U-value, in excess of the building regulations, because of the environmental criteria of the whole scheme, has been easily achieved. In fact, an even lower U-value has been reached by Jablite Flat Roof Tapered (FRT).

Lead architect on the project, Alasdair Travers, of Purcell Miller Tritton, explains: “The Jablite FRT performed a dual role, not only as an insulator, but also as structural void filler.  The difference between the basement roof and the level we needed to reach for the terrace needed to be appropriately filled.

“The solution was to use extremely densely moulded Jablite FRT, that would have the compressive strength to withstand the weight of a fire engine ─ a key factor in the overall design of the building ─ without damage to the stone slab finish or to the structure.

“The combination of the thickness of material used to fill the space and the unusual density mean that we will exceed our own target U-value by some margin,” adds Alasdair.

The Jablite FRT supplied was moulded to a density of EPS 500, the typical density being between EPS 100 and EPS 200, depending on the performance needed. The EPS 500 density is an unusual, but extraordinarily robust option that provided the compressive strength necessary for the café terrace.

John Walsh summed up the choice of Jablite FRT for the Maritime Museum project: “Jablite were able to meet all the necessary requirements with their product.

“We found the technical support provided by Jablite to be excellent, their input was comprehensive and timely and we would have no hesitation in using their products again.

“In fact, we would very much like to see the Jablite range of insulation products increased and made readily available in order that they can provide a viable and commercial alternative to the insulation products that currently dominate the insulation market,” he concludes.



Jablite Insulation and the Code for Sustainable Homes

The Code for Sustainable Homes (the Code) is the national standard for the sustainable design and construction of new homes. The Code aims to reduce our carbon emissions and create homes that are more sustainable. It applies in England, Wales and Northern Ireland.
A copy of the Code can be found here.


Mat 01: Environmental Impact of Materials

Jablite insulation products are made from EPS (expanded polystyrene) which has an A+ rating in the BRE Green Guide*.

*The BRE Green Guide to Specification provides you with easy-to-use guidance on how to make the best environmental choices when selecting construction materials and components. 

Environmental rankings:  A+ represents the best environmental performance and E the worst environmental impact.


Jablite Insulation has a Global Warming Potential (GWP) of less than 5 and an Ozone Depletion Potential (ODP) of zero.

The blowing agent used during manufacture is pentane which has zero ODP and a GWP of less than 5.


Jablite Insulation and BREEAM

BREEAM (Building Research Establishment Environmental Assessment Method) sets the standard for best practice in sustainable design and in the measurement of a building's environmental performance. BREEAM enables developers, designers and building managers to demonstrate the environmental credentials of their buildings to clients, planners and other parties,
You can find out more about BREEAM here


In this category, the specified aim of BREEAM is to “recognise and encourage the use of thermal insulation which has a low embodied environmental impact relative to its thermal properties and has been responsibly sourced.”

It is a pre-requisite of BREEAM that any new insulation specified for use within the following building elements must be assessed:
1.    External walls
2.    Ground floor
3.    Roof


Jablite insulation products are made from EPS which has been given an A+ rating by the BRE.

The calculation of embodied impact relative to thermal performance is a function of the material volume (for each build), its BRE Green Guide Rating and its thermal conductivity.

The thermal conductivity of our products is available on both the product packaging and on relevant product technical datasheets which can be found on this website.


Jablite insulation products are manufactured in factories which are ISO 14001 certified and Jablite purchases raw material from suppliers who are ISO 14001 certified.
Key Process (Insulation Manufacture)
ISO 14001: Certificate Number EMS 559414

Supply Chain Processes (supply of materials for end products)
ISO 14001
Certificate Number NL 007629-1 



Jablite Insulation and the Environment


Jablite insulation products are 100% recyclable. We collect waste from building projects and recycle it.

Our manufacturing process

All Jablite insulation products are manufactured at sites with ISO 14001 certification.

Steam is the main ingredient used in the manufacture of Jablite insulation.  The water consumption is low because the water is clean and can be re-used many times in the process.

No solid waste is generated during the manufacturing; any broken or faulty parts that do not pass our stringent quality control standards can be broken up and re-introduced into the process.

Jablite insulation products do not contain and are not manufactured using any substances which are controlled under Montreal or Kyoto Protocols.

Efficient use of natural resources

Jablite insulation products are  98% air and therefore extremely resource efficient. The lightweight nature of Jablite insulation means that less fuel is used when transporting from factory to building site.

Jablite insulation products are made from expanded polystyrene (EPS), a plastic that is obtained from oil. In Europe, the percentage of oil used in manufacturing EPS is 0.1%. 


The monomer styrene has been manufactured for more than 70 years and is used in a wide range of products.

Styrene exists naturally and can be found in many foodstuffs including strawberries, beans, nuts, beer, wine, coffee beans and cinnamon.


Pentane, a non-CFC expansion agent is used to expand polystyrene granules into the cellular structure that makes the production of EPS possible.

Pentane is a slightly volatile liquid in the same chemical family as methane, ethane, propane and butane and is continually being formed in natural processes in the digestive systems of animals and the decomposition of vegetables. It is not considered a substance harmful to health by European health authorities.

Pentane does not contain chlorine and therefore does not harm the ozone layer.

No CFC’s (chloroflourocarbons) or HCFC’s (hydrochloro-fluorocarbons) are used in the manufacture of EPS.







Download a concise summary of  the performance of Jablite insulation products with regard to the Code for Sustainable Homes and BREEAM here.