Jablite is the UK's largest producer of EPS products for insulation and civil engineering applications

Inverted Roof Insulation (Tapered)


Jablite has developed the first BBA-certified tapered Insulation for inverted or protected membrane roofs. This unique tapered insulation for inverted roofs provides a bespoke-designed drainage fall - removing the need for a screed layer.

An inverted roof construction places thermal insulation above the waterproof layer. This maintains the insulation at an even temperature and protects the waterproof membrane from the damaging effects of UV radiation and the effects of the weather.

The specified thermal performance of the inverted roof is achieved through the roof design and the thickness of the insulation used. U-values as low as 0.10W/2mK can be achieved.

Key Benefits
  • BBA (British Board of Agrément) accredited , certificate no 01/3812
  • Tested and approved to ETAG 031 (European Technical Approval Guidelines)
  • Boards sized 1200 x 600 mm
  • Places less loading on the roof structure
  • No drying time – reducing installation time and costs
  • Easier and faster installation over a flat deck
  • Allows the creation of long runs or falls
  • EPS is 100% recyclable

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Downloads & Specifications
Inverted Roof Insulation (Tapered)

BBA Certificates and other supporting documents can be found in Technical Resources

Technical Resources
Technical information
Product specification


Available EPS 200, 200 HP and 300 grade
In boards sized 1200 x 600 mm
With overlap designed into the boards to prevent uplift during installation
Achieves Fire Class E

Filter Membrane
Jablite Filter Membrane is an integral part of the insulation installation with Jablite insulation products for inverted roofs. It gives added protection to the insulation and improves the thermal performance of the insulation by reducing water ingress.


Thermal Resistance (R value)

Indicative thermal resistance or R-value figures of Jablite Flat Roof Inverted are:

100mm 3.03m²K/W
120mm 3.64m²K/W
140mm 4.24m²K/W
150mm 4.55m²K/W
160mm 4.85m²K/W
175mm 5.30m²K/W
200mm 6.06m²K/W


+Does Jablite’s manufacturing process use a lot of energy?
No. Compared with other insulation materials, the manufacturing process uses only small amounts of energy as the Jablite EPS bead is expanded by steam.
+Does Jablite manufacture to ISO 14001?
Yes, Jablite is certified to the BS EN ISO 14001 Environmental Management System standard.
+Is Jablite accredited to ISO 9001?
Yes, all Jablite sites are accredited to BS EN ISO 9001 Quality Management System.