Where part of the basement wall encloses a cold cellar or unheated garage, apply the insulation inside the basement, against the cold cellar or garage walls, treating them like exterior basement walls. Weatherstrip and insulate the doorway from the basement. Finally, insulate the ceiling of the cold cellar or garage. (See Open foundations, for information about exposed floors.)

Extend the outside insulation around the rest of the basement by at least 610 mm (24 in.) beyond the inside wall junction to minimize heat loss at these points. (For information about insulating a cold cellar, see Insulating the basement from the inside).

If a concrete porch is butted against a basement wall, a paved driveway or some other obstruction, the insulation should switch to the inside around these obstacles. Allow at least 610 mm (24 in.) of overlap to provide continuous coverage and reduce the heat loss through the thermal bridge.