Over-rafter insulation

In contrast to thermal insulation between the rafters, with the over-rafter insulation system the insulation boards are laid on formwork over the rafters. This has the advantage that very large thicknesses of insulation can be achieved in this way (over-rafter insulation plus full-fill rafter insulation). The roof structure for this application is usually carried out as follows:

  1. Roof battens
  2. Roof covering
  3. Counter battens
  4. JACKODUR thermal insulation
  5. Breathable sarking membrane
  6. Timber formwork
  7. Rafters
  8. Fixing in place (e.g. Bierbach fastening technique)

Used as over-rafter insulation, the JACKODUR thermal insulation boards fulfil the minimum requirements of DIN 4108-10 DAD. Lay the insulation boards, with a shiplap or tongue-and-groove edge profile, fully over the formwork without gluing in place. Lay the boards in a bond pattern, laying them closely butted on a clean and even substrate. Discontinuities or open joints can be filled with cut-to-size strips of the insulation material or with PU foam as appropriate.

Recommended products

JACKODUR KF 300 Standard SF
JACKODUR DS 300 Standard NF

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