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Ravatherm XPS X ULTRA 300 SL is a thermal insulation product designed for inverted flat roofs, offering architects and specifiers the thinnest XPS insulation with a design lambda of 0.028 and declared lambda 0.027 W/mK for the whole thickness range from 70 to 205mm.

This high performance flame retarded extruded polystyrene with exceptional lambda insulation performance and a Global Warming Potential (GWP) of less than five. Its exceptional thermal properties give architects additional design flexibility in the construction of energy efficient buildings.

Ravatherm XPS X ULTRA 300 SL is a high-performance, multi-purpose polystyrene for the thermal insulation and frost protection of inverted flat roofs, green and blue roofs.

It is manufactured by an extrusion process which results in homogeneous, closed-cell material structure and smooth surface skin (extrusion skin) which has many favourable material characteristics.

General information



Steel grey


Extruded polystyrene




1250 x 70 x 600 mm

1250 x 80 x 600 mm

1250 x 105 x 600 mm

1250 x 130 x 600 mm

1250 x 145 x 600 mm

1250 x 175 x 600 mm

1250 x 205 x 600 mm

Uniclass 2015
Extruded polystyrene (XPS) boards (Pr_25_71_63_29)Primary
Digital objects
PlatformCompatibleVersionCertified to
- 1 2.1
- 1 2.1
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