Where should I look for cracks?
- On old walls
- Around installed appliances
- Areas of pipe or cable fittings
How to draught proof cracks
Older properties tend to have a few visible cracks in their walls. If you have any really significant cracks, we would advise booking an appointment with a building surveyor to ensure the structural integrity of the building
If they are small and don’t pose any structural threat then you can fill them to stop draughts, which will help improve the energy efficiency and thermal comfort of the property. While the amount of heat loss that may occur through these cracks is relatively small compared with that of windows and doors, the ease in which they can be draught-proofed makes them a popular focus.
Cracks can change size, depending on seasonal changes or shifting pressures on the structure. This means they need to be filled using flexible filler products that allow for a certain level of movement – if you just use Polyfilla, the crack will reopen.
If it’s a crack that will stay at a constant width, rigid filler provides a smoother, more professional finish and effectively removes any draught that may have been present previously. Once the crack is filled and the filler has dried, it can be sanded down and painted to match the rest of the wall.
For larger cracks and gaps, foam-based filler products should be used. This foam expands once it is squeezed into the crack, creating an airtight seal. Once the foam has set solid it can be sanded down and painted to match the surrounding area. It is difficult to get the same level of professional finish as with a rigid filler.