KORE Inverted Flat Roof is a high performance profiled insulation board (EPS200 & 300) that can be used in conjunction with a flat roof system.

Available in a range of thicknesses with a very high compressive strength with low water absorption properties.

Perfect for use on inverted flat roofs or zero-pitched untrafficked roofs, balconies, and terraced roofs subject to pedestrian access only, with a gravel ballast or paved finish on a suitably designed timber, concrete or metal structural deck and appropriate fully supported waterproofing system.

Ideal for use with a green roof finish.

  • Meet & Exceed Building Regulations

    KORE Flat Roof can achieve a U-value of 0.19W/m2K with 160mm of KORE EPS200 White

  • Completely Water Resistant

    KORE Flat Roof manufactured with EPS offers low water absorption properties, protecting against freezing

  • Suitable for a Wide Range of Flat Roof Applications

    KORE Flat Roof can be used in a variety of applications including inverted flat roofs, standard flat roofs, warm flat roofs, tapered roofs, profiled sheet roofing and cut to fall tapered roof insulation

  • Sustainable & Easy to Work With

    KORE EPS is suitable for residential and commercial applications, offers a third-party verified EPD and is lightweight and quick and easy to install


U-values – Thermal resistance – Product performance – Certificates

Fully certified

  • Manufactured to IS EN 13163:2012+A2:2016 and in an ISO 9001:2015 QMS certified facility
  • Full Declaration of Performance Certificates available
  • Third-party Environmental Product Declaration certified by IGBC and EPD Ireland

Meet KORE Flat Roof

Physical Properties of KORE EPS Inverted Roof Boards




Reaction to fire

Class E

Class E

Thermal conductivity



Minimum compressive strength at 10% compression (kPa)

CS (10) 200

CS (10) 300

Minimum bending strength



Water vapour diffusion factor

40 to 100

40 to 100

Long term water absorption by partial immersion

WL(P)i 0.2kg/m²

WL(P)i 0.1kg/m²





5mm difference between diagonals

5mm difference between diagonals

Dimensions of KORE EPS Inverted Flat Roof Boards

Board Type

Type 1

Type 2

Surface Length (mm)

Standard 1200mm (can be cut to other sizes up to 1800mm)

Standard 1200mm

Surface Width (mm)

Standard 1200mm

Standard 1200mm

Full Board Size ( L x W)

1200mm x 1220mm

1220mm x 1220mm

Thicknesses (mm)

100, 150, 200, 250, 300 (other thicknesses available upon request)

100, 150, 200, 250, 300 (other thicknesses available upon request)

Lap Joined Edge



Board Type 1 – Shiplapped 2 sides

Board Type 2 – Shiplapped 4 sides