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

2. Premium Green Roof Insulation


Jablite's Premium Green Roof Insulation for inverted roofs is KIWA-certified and is available in a wide range of densities to meet the specified compression performance for green and brown roof applications including light traffic maintenance roofs and roof terraces.

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. The specified thermal performance of the inverted roof is achieved through the roof design and the thickness of the insulation used.

Key Benefits
  • KIWA Certified (BAR-19-098-S-A-UK)
  • Suitable for use on flat roofs with zero pitch and slopes up to 10°
  • Resistant to the effects of freeze/thaw
  • Meets the application’s required compressive strength
  • Supplied in 200, 300, 500, 600 and 200+ grade
  • 100% recyclable

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Downloads & Specifications
2. Premium Green Roof Insulation

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

Technical Resources
Technical information
Product specification

Jablite supplies insulation boards in a range of grades suitable for all flat roof applications.

Jablite Premium Green Roof Insulation for inverted roofs is supplied in  200, 300 and 200+ grades that are suitable for the loads associated with light maintenance traffic on roofs, pedestrian foot traffic on balconies and roof terraces.

Jablite Premium Green Roof 500 and 600 grade is available for higher loading requirements.

Where paving slabs are to be placed over the insulation on spacer pads the point loads should be calculated to an equivalent uniformly distributed load (See datasheet for example).

Thermal Conductivity (W/mK)

Jablite Grade 200 200+ 300
(W/mK) 0.035 0.033 0.035


1200 x 1200mm (with 15mm rebated edges)
Board coverage 1.44m²
Single thickness 50mm up to 240mm
(in 5mm increments)

U-value table

The table below shows average thickness of Jablite Inverted Roof Insulation range required to achieve U values from 0.25 W/m²K down to 0.10 W/m²K. The calculation is based on an inverted roof construction of 150mm reinforced concrete deck, hot melt waterproofing, Jablite Inverted Roof Insulation, Jablite Filter Membrane, drainage factor ƒx  = 0.001 and average rate of precipitation (P) ≤ 3.000 (mm/day).

U-value (W/m2K):
U Value THICKNESS (mm)
200 Premium* 200 Premium+* 300 Premium*
0.25 135 125 135
0.24 140 130 140
0.23 145 140 145
0.22 150 145 150
0.21 160 150 160
0.20 165 160 165
0.19 175 165 175
0.18 185 175 185
0.17 195 185 195
0.16 210 195 210
0.15 220 210 220
0.14 235 225 235
0.13 255 240 255
0.12 275 260 275
0.11 300 285 300
0.10 330 310 330
+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.
+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