IWI to curved bay

Detail for internal wall insulation fixed to the inside face of a curved bay. Designed to retain the character of the existing curved face without compromising the thermal efficiency of the building envelope.

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

Target U-Value: 0.3W/m2K

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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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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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IWI to suspended floor, parallel joists

Detail for internal wall insulation, continuous to a suspended floor, or an internal floor; accessible from below to be in-filled with insulation; where the existing joists run parallel to the external 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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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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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 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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