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  1. IWI to upper floor with perpendicular joists

    Detail for internal wall insulation to an existing timber floor, where the existing floor joists are perpendicular to the wall to be insulated.

    This Internal wall insulation system uses an intelligent membrane to regulate vapour diffusion. This membrane should continue across intermediate floors, ensuring continuous insulation, vapour-control and air-tightness.

    The detail provides information on the packing of joist ends in wall, and air-tightness measures, in order to prevent cold-bridging at junctions between IWI and internal upper floors.

    Target Values Target wall U-Value: 0.3 W/m²K Target floor U-Value: 0.2 W/m²K

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