Rigid panel insulation panel / wood fiber / interior / with vapor barrier
MULTIPLEX TOP Ecological Building Systems


  • Form:

    rigid panel

  • Composition:

    wood fiber

  • Type of vapor barrier:

    with vapor barrier


GUTEX Multiplex-top is a rain-tight vapour diffusion open sarking board. It is a dense, rain-tight, durable, insulating non bituminous woodfibre sarking board which features a homogenous single-layer raw density profile. It is designed for new roofs, roof refurbishments and external wall insulation behind a ventilated façade. The board may also be applied for interior applications.

GUTEX Multiplex-top has an exceptionally high density and has a unique tongue and groove format for increased wind and water tightness. The boards offer effective protection against heat loss in winter and heat protection in summer months. GUTEX Multiplex-top is available in thicknesses of up to 35mm in one single ply. The boards have an extremely low vapour resistance (µ = 3), ensuring vapour diffusion is optimized for the most breathable constructions. This minimized risks associated with condensation within building elements. Externally insulating a building with GUTEX Multiplex-top can make significant reductions in the U value of a building whilst also eliminating non repeating thermal bridges at key junctions (i.e. windows, doors, separating floors, at foundation level, etc.)

GUTEX Multiplex-top also improves the acoustic performance of the external fabric of the building based on its fibrous nature and high density


Other Ecological Building Systems products


Airtight Membranes

Windtight Membranes



Climate board