Low Energy House - Draught Proofing - Airtightness
In cold weather, warm air from inside the home passes naturally through the building
envelope into the cold air outside. This warm air draws in cold air from the outside which enters the
home as draughts. This is uncomfortable for occupants and an expensive waste of energy
Heat Loss from Houses - Cracks, Gaps and
The exchange of warm and cold air, which produces draughts through the building envelope, can take
place dramatically where there are cracks, gaps and holes in the roof, walls and floors.
The main sources of draughts are:
- External Doors
- Suspended floors
Draught Proofing an Existing House
Draught proofing is one of the least expensive and most effective energy efficient measures in the
home. It is particularly effective when combined with insulation.
Many cracks and holes in the plasterwork and finishes can be filled in the regular decorating
process. Other sources of draughts can be stopped-up using draught proof seals.
Large holes, which often occur where cables and pipes pass through the loft
floor, can be filled with expanding foam sealants.
If you are carrying out a comprehensive draught proofing scheme make sure you provide controllable
ventilation to bathrooms, kitchens and utility rooms to remove water vapour and prevent damaging