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

3. Premium Tapered Inverted Roof Insulation

Overview

Jablite's KIWA-certified Premium Tapered Inverted Roof Insulation is the only tapered insulation for inverted roofs on the market. It provides a bespoke-designed drainage fall - removing the need for a screed layer to create a fall.

Jablite Premium Tapered Roof Insulation is supplied in a wide range of densities to meet the specified compression performance for applications from light traffic maintenance roofs to car parks and podiums.

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
  • 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

Book a CPD about insulation options for flat roofs

One of our team will come to your office to deliver a CPD and to answer your questions

Click here

Sign-up to Jablite Newsletters

When we have something interesting to share – we’d like to get in touch…

I'd like to hear from Jablite
Downloads & Specifications
3. Premium Tapered Inverted 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 Tapered Inverted Roof 200 and 300 Premium and 200 Premium+ have adequate resistance to the loads associated with light maintenance traffic on roofs, and to pedestrian foot traffic on balconies and roof terraces. Jablite Premium Tapered Inverted roof 500 and 600 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) 0.033 0.031 0.033

Dimensions

Size 1200 x  600 mm (with 15 mm rebated edges). Board coverage 0.72 m²
Fall 1:80
Thickness Single thickness 70 – 205 mm
(in 15mm increments)
Taper Over the 1200 dimension

 

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 AVERAGE  THICKNESS (mm)
200 Premium* 200 Premium+* 300 Premium* 500 Premium 600 Premium
0.25 125 120 125 145 150
0.24 130 125 130 150 155
0.23 140 130 140 155 160
0.22 145 135 145 165 170
0.21 150 140 150 170 175
0.20 160 150 160 180 185
0.19 165 155 165 190 195
0.18 175 165 175 200 205
0.17 185 175 185 215 220
0.16 195 185 195 225 235
0.15 210 195 210 240 245
0.14 225 210 225 255 265
0.13 240 225 240 280 285
0.12 260 245 260 300 305
0.11 285 265 285 325 335
0.10 310 290 310 360 365
FAQ
+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
+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.