NBS Source
Paratherm G


Paratherm G is a high performance insulation suitable for use beneath most mechanically fixed single ply non-bituminous and mechanically fixed bituminous waterproofing (one and two layer). It is faced on both sides with a glass fibre tissue auto-adhesively bonded to the insulation core during manufacture. The core of Paratherm G consists of a high performance CFC-free rigid urethane insulant of typical density 32 kg/m³. It is produced using alternative blowing agents in compliance with the Montreal Protocol.

Paratherm G is suitable for use on access roof decks subject to limited foot traffic.

General information

Uniclass 2015

Pr_25_71_63_67 Polyurethane (PUR) foam boardsPrimary


J41/420 Rigid urethane foam warm deck roof insulation

Specification data - Polyurethane (PUR) foam boards

Product Reference

Paratherm G


25 mm

30 mm

35 mm

40 mm

45 mm

50 mm

55 mm

60 mm

65 mm

70 mm

75 mm

80 mm

85 mm

Standard product features

Dimensions (l x w):

2400 x 1200 mm.

Compressive strength:

Exceeds 150 kPa at 10% yield when tested to BS 4370-1.

Water vapour resistance:

Achieves a resistance of greater than 15 MNs/g when tested in accordance with BS 4370-2.

Thermal conductivity:

0.023 W/mk.


Can achieve a U-value of as low as 0.23 W/m²K in certain applications – consult manufacturer's literature for details.

Fire performance:

Class 1 rated according to BS EN 476-7 Surface Spread of Flame Test.

Product Options


Other thicknesses are available subject to quantity.

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