Thermal Insulation Slab
Trade Insulation Range

Thermal Insulation Slab

Keeping homes warm and costs low. 

The rising cost of energy bills is putting thermal performance ever higher on the home owner’s agenda. ROCKWOOL Thermal Insulation Slab provides unmatched fire resistance and insulation for residential extensions and renovations, protecting families and homes, as well as keeping energy bills to a minimum.


Made from stone wool, ROCKWOOL Thermal Insulation Slab is an exceptional fire-resistant insulation, achieving the very highest Euroclass classification of A1 non-combustible. The slabs feature the patented ROCKWOOL ‘FLEXI’ edge, so are easy to handle and install. Thermal Insulation Slab is water repellent, but also vapour permeable, which allows it to breathe, preventing potentially damaging moisture build up, which can cause rot and mould.

The ROCKWOOL Thermal Insulation Slab will not sag or slump over time to deliver long term thermal performance. The insulation is a robust fire resistant and thermal insulation solution for residential extensions and renovations, as well as use in lofts. 



CE Marked

  • Excellent Thermal performance – thermal conductivity of 0.035W/mK
  • With a Euroclass rating of A1 non-combustible, Thermal Insulation Slab delivers the highest levels of fire resistance. 
  • The patented FLEXI® edge offers an accurate fit for all widths, overcoming problems with cold spots and acoustics that are associated with other types of insulation
  • Water repellent and vapor permeable, helping to resist rot and mould

Product Properties

Compliance BS EN 13162
Reaction to fire Fire Classification Eurcoclass A1 (BS EN 13501-1)
Thermal conductivity 0.035WmK
Water repellent Repels water

Product range and ancillaries

Thickness (mm)

Width (mm)

Length (mm)

Item number External item number Country Thickness (mm) Width (mm) Length (mm) Pieces Per Pack Packs Per Pallet m² Per Pack m² Per Pallet
180894 180894 UK 140 600 1200 4 12 2.88 34.56

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Thermal Insulation Slab - v3

Thermal Insulation Slab Datasheet


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