Thermal insulation regulations may require insulating dpcs to
prevent cold bridging around window and door openings in cavity
wall construction (see pages 488 and 489). By locating a vertical
dpc with a bonded insulant at the cavity closure, the dpc prevents
penetration of dampness from the outside, and the insulation
retains the structural temperature of the internal reveal. This will
reduce heat losses by maintaining the temperature above dewpoint,
preventing condensation, wall staining and mould growth.Application ~Refs. Building Regulations, Approved Document L: Conservation of
fuel and power.
BRE Report † Thermal Insulation: avoiding risks (3rd. ed.).
Building Regulations, Approved Document B3, (Vol. 1), Section 6:
Concealed spaces (cavities).Insulating Damp-Proof Course