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Flat roofing insulation | Evatherm L

Evatherm L

Evatherm L is a high performance rigid polyisocyanurate (PIR) foam board with rebated ends for use in warm roofs under a Liquid Applied Waterproofing system, such as the ICB Mariseal PU system and ICB PMMA FLEET System.

The board is tongue and grooved, but taping the joints is still essential and may provide a better finish with less ghosting of the joints being visible. For tapered roofing, we recommend anormal tapered system using Evatherm A is installed with a finishing 50m layer of Evatherm L. Currently Evatherm L is only available in thicknesses of 50mm, 90mm, 110mm, 130mm, 150mm; in 2.4m x 1.2m board sizes. These boards are bonded using a PU adhesive such as ICB Instastick.


  • Wide range of thicknesses
  • Low thermal conductivity
  • Reduced risk of condensation
  • Rot proof, durable and maintenance free
  • Lightweight and easy to cut
  • Fire safe
  • Available with lap joint edge profile
  • Manufactured to ISO 9001

Call us on 01202 785200