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  1. EWI Plinth Insulation to below ground

    Detail for an external wall insulation plinth detail to just below ground level. Intended to ensure water-tightness and prevent thermal bridging to zones under an existing floor by providing continuous insulation down to ground level.

    Woodfibre EWI to stop a minimum of 300mm from the external ground level, with XPS insulation fixed using adhesive bond to carry down to below ground level, a minimum 300mm below the internal floor level of the building.

    Target Values: 0.2 W/m2K for whole construction.

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  2. EWI to just below ground with plinth and ventilation detail

    Detail for external wall insulation to below ground floor level, with a periscopic vent and air-brick installed through EWI to ventilate a basement or cellar. Required where existing air-bricks to a sub-floor space/void would be blocked by the installation of External or Internal wall insulation. Periscopic vents should ensure continued clear air-path to sub-floor, to ensure adequate ventilation.

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  3. EWI Recessed Plinth to just below ground

    Detail for external wall insulation plinth to ground, where the internal floor of the building to be retrofitted is solid beneath the internal finished floor level. EWI is carried down to 300mm minimum below internal floor level to prevent cold bridging, but stopped short of external ground level.

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