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  1. Retained window to EWI, thin jamb (section)

    Detail for external wall insulation to an existing window to be retained, where the existing window sits up against the inside edge of existing window jamb. This detail proposes phenolic foam to be used where the existing window jamb and head is too narrow for standard 40mm woodfibre reveal boards.

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  2. Retained window to EWI, thin jamb (Plan)

    Detail for external wall insulation to an existing window to be retained, where the existing window sits up against the inside edge of existing window jamb. This detail proposes Aerogel insulation to be used where the existing window jamb and head is too narrow for standard 40mm woodfibre reveal boards.

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  3. Retained window to EWI, with sloping cill

    Detail for external wall insulation to an existing window, to be retained, with an existing sloping cill.This detail allows for the profile of the sloping cill to be retained whilst improving the thermal efficiency of the building envelope by allowing insulation to be carried up to the window frame underneath the tiled cill. Used in instances where the original window jamb is reduced in depth.

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