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Jablite Flat Roof Tapered


Key Features of Jablite Flat Roof Tapered

  • 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)
  • Provides a full insulation cover in one layer
  • Single-piece MONOMITRE hip and valley sections save time, material and money on site
  • 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 3B or SBS felt, or foil face if required

Ordering Jablite Flat Roof Tapered Classic Board

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

Standard size is 1200 x 1200mm, 1200 x 900mm and 600 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)

Standard gutter boards are available in sizes 1200 x 300mm, 1200 x 400mm and 1200x 600mm saving time on site, making setting out easier and reducing on site errors.

Jablite Flat Roof Tapered has been assessed and approved by the British Board of Agrément for insulating inverted roofs; certificate 01/3812.

Click here to download the BBA certificate

Relevant Applications View our Case Study


Central Roofing, Managing Director, Tony Davies says:  “Jablite’s Tapered Roof Board suits us because it is just one board cut to the thickness we need. It is quick and easy to install and a lot less hassle than a PIR board where we have to glue together individual layers to the required thickness.

“I estimate that Jablite Roof Board can be 2.5-3 times quicker to install – depending on how many layers have to be glued. Another good thing about Jablite roof insulation products is that Jablite collects off-cuts from the site and recycles them in the UK - we are ISO 14001 registered so that is important to us."

Jablite FRT is designed to insulate warm-deck flat-roof constructions. It can be used with all types of new and existing roofs with decks of concrete, metal, woodwork or timber and with either a built-up felt or EDPM finish.

Jablite FRT is well-suited for ‘cut to fall’ schemes and Jablite provides free surveys and technical advice to design the ‘cut to fall’ to suit your requirements.

Flat Roof

Flat roofs can be insulated with:

  • Jabroof Board   
  • Jabtherm
  • Jablite Flat Roof Taper (FRT)
  • Jablite Flat Roof Profiled (FRP)
  • Jablite Flat Roof Profiled+ (FRP+)
  • Jabroll

The East London Mosque, situated in the inner London Borough of Tower Hamlets between Whitechapel and Aldgate, serves one of the UK's largest Muslim community mainly of Bangladeshi heritage.

The Mosque lies near the edge of the City of London and a couple of miles from London Docklands.

A nine-storey addition, the Maryam Centre, opened in 2012. The centre, named after the mother of Jesus, has facilities aimed solely at women, including fitness gyms, clinics and counselling rooms.

To insulate the roof of this iconic building, Jablite Flat Roof Tapered insulation was chosen.

The roof insulation was designed to achieve specified U-values and to meet Building Regulations.

In addition, the Jablite-designed cut-to-fall enabled drainage and the avoidance of  water pooling on the roof which included some paved areas for use by residents:

“One of the great benefits to us was that Jablite has the ability to mould the insulation to the required thickness to achieve the U-value.

"That meant we only had one board to install rather than having to put down, and stick, several layers to achieve the same thermal performance,” says Jon Hammersley, Hambro Roofing.

“Jablite insulation was lightweight and easy to install. We did not need specialist PPE or equipment.

"There is no waste with Jablite insulation as it’s 100% recyclable and Jablite collected our offcuts from the site and recycled them.”




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.