General Guidance
Retrofitting measures that would reduce air permeability
- Full double (or triple) glazing;
- Secondary glazing fitted;
- Effective closures on trickle vents and other controllable ventilation devices;
- All external doors with integral draught seals and letter box seals;
- Internal and external sealing around doors and window frames;
- Filled cavity or solid walls;
- External insulation fitted;
- Internal insulation plastered or with airtightness membrane fitted;
- Impermeable overlay and edge sealing of suspended ground floors;
- Careful sealing at junctions between building elements such as between walls and floors or ceilings;
- Careful sealing around loft hatch;
- Careful sealing around chimney or flue penetrations;
- Careful sealing around internal soil pipe;
- Careful sealing around domestic water and heating pipes passing into externally ventilated spaces;
- Careful sealing of all service penetrations in the building fabric (electricity, gas, water, drainage, phone, TV aerial, etc.);
- Internal warning pipe for WC;
- All cable channels for light switches and power sockets sealed;
- All cable entry for lighting and ceiling roses sealed. Recessed lighting should not penetrate ceilings below attic spaces.
appropriate permanent ventilation or seek specialist advice.