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  1. IWI to suspended floor, perpendicular joists (access below)

    Detail for internal floor insulation to a suspended internal floor, accessible from underneath in order to retain an existing floor finish.

    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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