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Used in addition to traditional insulation, thin insulation limits heat loss and radiation transmissions.

Thin insulation technique

It is recommended to lay the first layer of thin insulation directly under the cover, between the battens and the rafters, and then complete with a second layer of traditional insulation, on the inside.

  • To be effective, a thin insulation requires imperatively the presence of two blades of air.
  • A first air gap is left between the cover and the thin insulation.
  • Its thickness varies from 2 to 4 cm minimum depending on the ventilation or not of the roof.
  • A second layer of air with a minimum thickness of 2 cm interposes between the thin insulation and the traditional insulation.

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In the case of single-layer installation of thin insulation, this second air gap must be inserted between the thin insulation and the finishing facing.

Attic insulation: laying a thin insulation: thin

  • Tension and staple the insulation strips under the rafters creating a sufficient air gap between the insulation and the cover.

Attic insulation: laying a thin insulation: attic

  • Overlap the strips 5 to 10 cm and staple every 5 cm on a wooden support.

Attic insulation: laying a thin insulation: insulation

  • Treat the fittings with a suitable adhesive.
  • For more sealing, it is possible to fix a batten against faults.

Attic insulation: laying a thin insulation: laying

  • Cut the insulation with the cutter at the places where the lines hosting the furs must pass.


Video Instruction: How to install loft Insulation with Wickes