Kingspan GreenGuard GG300


Suitable for inverted roofs, basements, car park decks, and heavy-duty commercial, industrial and cold store flooring; new build and refurbishment.


High performance rigid extruded polystyrene (XPS) insulation board with a high compressive strength and a closed cell structure that resists water absorption and water vapour passage. The board is chlorofluorocarbon (CFC)/ hydrochlorofluorocarbon (HCFC) free and manufactured with a blowing agent that has zero ozone depletion potential (ODP) and low global warming potential.

Kingspan GreenGuard GG300 is manufactured under a management system certified to ISO 9001: 2015 (Quality Management Systems. Requirements), ISO 14001: 2015 (Environmental Management Systems. Requirements),  ISO 45001: 2018 (Occupational Health and Safety Management Systems), ISO 50001: 2011 (Energy Management Systems. Requirements with guidance for use)

Features and benefits:

  • High performance rigid extruded polystyrene insulation with low thermal conductivity.
  • High compressive strength.
  • Resistant to ground moisture penetration.
  • Easy to handle and install.

General information








1250 x 600 mm

Uniclass 2015

Pr_25_71_63_29 Extruded polystyrene (XPS) boardsPrimary


E20/200 Proprietary underslab insulation

J42/10 Warm deck roof covering

J42/415 Extruded polystyrene (XPS) warm deck roof insulation

J42/440 Inverted roof insulation

K11/115 Battened plywood floating floor

K11/125 Battened particleboard floating floor

K11/135 Battened oriented strand board floating floor

K11/145 Battened cement-bonded particleboard floating floor

K11/20 Battened particleboard floating floor

K11/215 Plywood floating floor

K11/225 Particleboard floating floor

K11/235 Oriented strand board floating floor

K11/25 Particleboard floating floor

K11/295 Floating floor system

M10/290 Floating construction

M10/40 Floating construction

M13/260 Floating construction

M13/40 Floating construction

Specification data - Extruded polystyrene (XPS) boards Enhanced data

Fire performance

To BS EN 13501-1, class E.


Compressive strength (minimum) at 10% compression

300 kPa.

Thermal conductivity (maximum)

0.034 W/m∙K.


30 mm.

40 mm.

50 mm.

60 mm.

70 mm.

80 mm.

100 mm.

120 mm.

140 mm.

150 mm.

Face size (length x width)

1250 x 600 mm.


Smooth, dense skin.



Product Reference

Kingspan GreenGuard GG300 Rebated (R)

1.25 m.

Kingspan GreenGuard GG300 Straight (S)

2.5 m.

Cross Section

Uniform thickness.

Global warming potential

Less than 5.

Ozone depletion potential



Fibre-free rigid extruded polystyrene insulant.

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