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Rocksilk® Krimpact™ Flat Roof Slab

Third party certifications:
  • BBA Agrément Certificate

    Certificate type

Knauf Insulation Ltd

A high strength, dense, rigid, non-combustible Rock Mineral Wool slab, specifically designed for use in flat roofing applications.

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+44 (0)1744 766 666 www.knaufinsulation.co.uk

Rocksilk Krimpact Flat Roof Slabs are high performance, non-combustible Rock Mineral Wool slabs with high compressive strength, suitable for use on all types of roof deck and can be overlaid either with a single ply membrane which is mechanically fixed, or with a waterproof membrane consisting of either a fully bonded built-up bitumen roofing system or mastic asphalt.

The slabs contain a special additive to ensure they are water repellent.

Features and benefits:

  • Good thermal performance.
  • Non-combustible A1 Euroclass Reaction to Fire classification.
  • Absorbent nature of the product reduces the drumming effect of rainwater.
  • Manufactured using specialist Knauf Insulation Krimpact Technology for high levels of compressive strength and durability.
  • The nature of Rock Mineral Wool allows slabs to knit together at joints.
  • Dimensionally stable.
  • Compatible with a wide range of single ply membranes.

General information

Slab length: 1800 mm

Slab width: 600 mm

Uniclass 2015
Mineral wool slab insulation (Pr_25_57_06_56)Primary
Specification data - Mineral wool slab insulation
Product Reference

Rocksilk® Krimpact™ Flat Roof Slab


100 mm

120 mm

145 mm

180 mm

Standard product features


  • Slab length: 1800 mm.
  • Slab width: 600 mm.

Thermal conductivity:

0.038 W/mK.

Fire performance:

Euroclass A1 to BS EN ISO 13501-1.


`B`generic BRE Green Guide rating.

Compressive strength:

60 kPa.

Third party certifications
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