What Is Draught Proofing?
Draught proofing involves sealing gaps and cracks to prevent cold air entry and warm air escape. While it's often confused with insulation, the two are different. Insulation prevents heat loss through the building's fabric (walls, floors, roof) by slowing down heat transfer. Draught proofing, on the other hand, deals with the movement of air itself, which can carry a significant amount of heat out of your home through a process called convection.
Addressing draughts represents the most cost-effective first step in making a home more energy-efficient and comfortable, especially in Ireland, where older homes can be particularly leaky.
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Where Do Draughts Occur in My House?
Draughts can be found in many places, both obvious and not.
Common areas for draughts:
- Windows: Gaps around frame, between sashes, or where glass meets frame
- Doors: Gaps around edges, through keyhole, or under door
- Chimneys and Fireplaces: Open chimney acts as constant vent
- Floorboards and Skirting Boards: Gaps between boards or where skirting meets floor
- Loft Hatches: Unsealed hatches cause major heat loss
- Pipes and Electrical Fittings: Gaps where pipes/wires enter from unheated spaces
- Airbricks and Vents: Damaged or improperly sealed airbricks
Detection Method: On a windy day, hold a lit candle or an incense stick near a suspected gap and watch for the flame or smoke to flicker.
How Do I Draught Proof a Window?
- Self-Adhesive Foam or Rubber Strips: These strips are cut to size and stuck to the inside of the window frame where the window closes against it. It's a cheap fix, but the strips can wear out or become unstuck over time.
- Brush Strips: Ideal for sash windows where there is a sliding movement. These have a metal or plastic backing with a brush that creates a seal while still allowing the window to be opened and closed. They are more durable than foam strips.
- Silicone Sealant or Caulk: For windows that don't open, you can apply a bead of silicone sealant or decorator's caulk around the frame to create a permanent seal. This is a very effective solution for fixed windows.
- Window Film: A DIY window insulation kit involves applying a clear plastic film to the inside of the window frame and shrinking it with a hairdryer. This creates an insulating layer of still air, similar to double glazing, and is a great temporary measure.
- Heavy Curtains: While not a permanent seal, heavy, lined curtains or thermal blinds can act as a significant barrier against cold air, especially if they reach the floor.
How Do I Draught Proof a Door?
- Draught Strips: Apply self-adhesive foam, rubber, or brush strips to the door frame where the door closes. Ensure strip thickness provides tight seal without difficult closing.
- Door Bottom Strips: For the gap under the door, a hinged flap or a brush strip screwed to the bottom of the door is highly effective. Alternatively, a simple fabric door snake or draught excluder placed at the base can be used as a temporary or quick fix.
- Keyhole Cover: A small metal disc that pivots over the keyhole can prevent a surprising amount of cold air from coming through.
- Letterbox Brush or Flap: A well-fitted brush or a spring-mounted flap on the inside of the letterbox will keep the wind out while still allowing post to be delivered.
How Do I Prevent a Draught From a Chimney?
An open fireplace is one of the biggest sources of heat loss in a home. Even with a closed damper, a lot of warm air can be lost.
- Chimney Balloon: This is an inflatable device that you push up into the chimney flue and inflate to create a tight seal. You must remember to remove it before lighting a fire.
- Chimney Sheep: A more breathable alternative to the balloon, this product is made of dense wool and is inserted into the chimney to block draughts while allowing a small amount of ventilation to prevent condensation.
- Permanent Sealing: If you never use the fireplace, you can have a professional permanently seal it off. This is a more involved solution but is the most effective for a disused chimney.
- Chimney Cap: A chimney cap, installed by a professional on the top of the chimney pot, can block a lot of wind and rain while still allowing some airflow.
Is Draught Proofing Worth It?
Absolutely. Draught proofing is arguably the single most cost-effective and impactful home energy upgrade you can make, offering a rapid return on investment and immediate improvements in comfort.
A house with draughts, even if the heating is on, will feel cold and uncomfortable, with noticeable cold spots and a constant feeling of a breeze. By sealing these leaks, you create a more stable and pleasant indoor environment, allowing your central heating system to work more efficiently and effectively. You are no longer heating the outdoors.
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How Much Does Draught Proofing Cost?
DIY Costs
| Item | Estimated Cost (€) | Notes |
|---|---|---|
| Self-adhesive foam/rubber strips | €5 - €15 | A roll of 5-10 meters is enough for several windows and doors. |
| Door bottom seals/brush strips | €10 - €30 per door | Cost varies depending on the material and design. |
| Silicone sealant or caulk | €5 - €10 per tube | Used for sealing gaps around fixed frames. |
| Chimney balloon/sheep | €20 - €40 | A simple and effective solution for disused chimneys. |
A homeowner could realistically spend between €30 and €100 on materials to tackle the main draughts in a standard Irish home.
Professional Costs
| Service | Estimated Cost (€) | Notes |
|---|---|---|
| Sash window draught proofing | €150 - €300 per window | Specialised service involving a brush-pile system fitted into the frame. |
| Full house service | €500 - over €1,000 | Includes all windows, doors, and a chimney, depending on house size. |
| Specialised services | Varies significantly | Often required for very old or listed buildings to avoid damage. |
The choice is clear: for a quick, cheap, and effective solution, the DIY route is an excellent choice. For a permanent, high-quality, and more aesthetically integrated result, particularly with period properties, professional services offer a worthwhile investment.
Will Draught Proofing Lower My Heating Bills?
The financial impact of draught proofing is significant and often underestimated. The Sustainable Energy Authority of Ireland (SEAI) and other energy experts consistently highlight draught proofing as one of the most effective ways to reduce heating bills.
A common estimate is that you can save up to 20% on your heating costs.
Based on a €1,500 average Irish gas bill: A 20% saving would equate to €300 per year.
Payback scenarios:
- DIY Payback: With a DIY investment of just €50, you could see a full return in just a couple of months.
- Professional Payback: Even with a professional service costing €600, the payback period would only be about two years.
After the initial investment, every subsequent year represents a pure saving. This is a crucial point that makes draught proofing such a powerful tool in managing household finances.
Are There Alternatives to Draught Proofing?
While draught proofing is the first step, homeowners with a larger budget can consider more extensive upgrades for a more energy-efficient home. These measures tackle heat loss through the building's fabric.
- Insulation: Upgrading your attic insulation, cavity wall insulation, or even external wall insulation will have the largest impact on your heating bills.
- New Windows and Doors: While expensive, replacing old, single-glazed windows and doors with modern, energy-efficient double or triple-glazed units can drastically reduce heat loss and improve your home's BER (Building Energy Rating).
- Heat Pump and Ventilation Systems: For a new build or a major renovation, installing a high-efficiency heat pump and a balanced mechanical ventilation system (MVHR) ensures a constant supply of fresh, filtered air while recovering up to 90% of the heat that would otherwise be lost.