Rafter Roll


Rafter Roll is a semi-rigid roll of glass mineral wool with extra high thermal performance, designed for insulating between the rafters of pitched roofs in both new build and existing buildings.

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Product Datasheet
  • Very high thermal performance
  • Provides thermal and acoustic performance
  • Quick and easy installation
  • Friction fitting allows rafter spacing to be completely filled.
Thickness (mm) Width x Length (mm) Area Per Roll m2 R-Value (m2K/W) Thermal Conductivity
100 mm 1200 x 4000 4.80 3.10 0.032

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ECOSE® Technology

Knauf Insulation mineral wool products with ECOSE Technology are made with a formaldehyde-free binder derived from rapidly renewable materials, instead of traditional petro-based chemicals used in other insulation.

ECOSE Technology is up to 70% less energy intensive than traditional binders. Complementing the new sustainability benefits, the patented ECOSE Technology also produces a ‘super-soft’ and easier to handle wool. The technology has been developed for Knauf Insulation’s glass and rock mineral wool products, enhancing their environmental credentials without affecting the thermal, acoustic or fire performance.

Insulation products made with ECOSE Technology contain no dye or artificial colours – the colour is completely natural.


Rafter Roll is for insulating between the rafters of pitched roofs in both new build and existing buildings. It is easy to cut and friction fit between rafters.

When installing Rafter Roll it is necessary to add a separate vapour control layer on the warm side of the insulation. In accordance with Building Regulation requirements, a 50mm ventilation path must be preserved behind the insulation if the underlay has high vapour resistance, for example traditional roofing felt.

Rafter Roll can be used either as a single or double layer between rafters, or as the first layer of a two layer system in combination with Knauf PIR Laminate.

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PDF icon Rafter Roll Product Datasheet

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