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High Performance Retrofit Scheme, Guston, Dover

This eco refurbishment was assessed using Passivhaus software and based on the EnerPhit principles.

External wall insulation was added using 200mm expanded cork, and finished with lime plaster.

Roofs were upgraded with 50mm polyurethane between rafters, plus 200mm sheeps wool under, with vapour control layer and plasterboard.

New passivhaus certified triple glazed aluminium/wood windows were installed, and a new comfort ventilation system (MVHR) from Itho.

Thermal bridges and air leakage were carefully addressed and rectified.  Air leakage was reduced in excess of 10 ach down to 2.8 ach.