IWI to retained window with secondary glazing

Detail for internal wall insulation to an existing window (single glazed), with a minimal frame depth. Where windows such sit outside the internal wall insulation, it is necessary to insulate the reveals to prevent a cold bridge. A secondary double glazed window unit is added to the inside face of the window for improved thermal performance.

Target Values: Psi cill value: 0.03W/m2k. Psi lintel value: 0.03 W/m2k. Target wall value: 0.3W/m2k.

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IWI to retained window with insulated reveal board

Detail for internal wall insulation to an existing window, to be retained, with a thin jamb profile, requiring a slimmer reveal board to provide continuous thermal insulation.

Target Values Cill: 0.045 W/mK. Lintel: 0.059 W/mK. Wall U-Value: 0.3 W/m²K

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IWI to new triple/double glazed window.

Detail for internal wall insulation to the head and base of new window, to be fitted in an existing window position, where the window sits outside the internal wall insulation. As such it is necessary to insulate the reveals to prevent a cold bridge.

Target Values Wall U-Value: 0.3 W/m²K

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IWI to new triple/double glazed window (inward opening)

Detail for internal wall insulation to the head and base of new window, to be fitted in an existing window position.

Where windows sit outside the internal wall insulation, it is necessary to insulate the reveals to prevent a cold bridge. This detail uses an insulated reveal board in order to prevent cold bridging through the external wall at the head and base of the new window.

Target Values Wall U-Value: 0.3 W/m²K

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