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

Inverted Roof Insulation


Jablite inverted roof insulation range of products is BBA-certified and approved to ETAG 031 (European Technical Approval Guidelines). It is currently supplied in two grades to meet the compression performance specified.

The insulation boards are designed with an overlap to prevent uplift during installation and can be specified in 1mm increments to meet the required U-values. The specified thermal performance of the inverted roof is achieved through the roof design and the thickness of the insulation used.

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

Key Benefits
  • BBA (British Board of Agrément) accredited , certificate no 01/3812
  • 200 grade is A+ rated in the BRE Green Guide to Specification
  • 300 grade is A rated in the BRE Green Guide to Specification
  • U-values as low as 0.10W/m2K can be achieved.
  • Insulates for the lifetime of the building
  • 100% recyclable
  • Durable and rot proof
  • Lightweight and easy to handle
  • Achieves Fire Class E
Downloads & Specifications
Inverted Roof Insulation

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

Technical Resources
Technical information
Product specification

Compression Performance

• Jablite 200 performs to design load capability 90KN/m²
• Jablite 300 performs to design load capability 120KNm²

Jablite insulation for inverted roofs  is supplied :

EPS 200 defined in BS EN13163
EPS 300 defined in BS EN13163
In boards sized 1200 x 1200mm
With overlapping boards to prevent uplift in installation

Thermal Resistance (R value)

Indicative thermal resistance or R-value figures of Jablite Inverted Roof insulation 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


Jablite inverted roof insulation is produced to the requirements of BS EN 13163 ‘Thermal insulation products for buildings – Factory made products of expanded polystyrene (EPS) – specification’.

Inverted Roof Insulation Downloads


Accessory products

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

Filter Membrane
+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.
+Why specify Jablite High Performance insulation?
Jablite's High Performance insulation board increases thermal performance by approximately 15% allowing a thinner insulation board to be specified.
+How are Jablite products rated in the BRE Green Guide to Specification?
Jablite manufactures EPS (expanded polystyrene) products which are A+ rated in the BRE Green Guide, except for Jablite 300 grade insulation for inverted roofs which has an A rating