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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