How to Draught-Proof Your Home for Winter (Melbourne Guide)

What You’ll Need

Tools

Materials

Why Draught-Proofing Matters in Melbourne

Melbourne’s housing stock is famously draughty. Roughly 60% of homes in suburbs like Frankston, Dandenong, Pakenham and Mornington were built before 1980, with single-glazed timber-framed windows, hollow doors, and minimal floor insulation over suspended timber subfloors. On a 7°C July morning, the gaps around just one badly-sealed external door can leak the equivalent of leaving a window open all day.

The Sustainability Victoria building data shows that the average uninsulated Melbourne home loses 15–25% of its heat through air leakage alone — before you even count radiative losses through windows and walls. That’s the difference between $80 and $120 on every winter gas bill. Draught-proofing is also the one envelope upgrade that doesn’t require Victorian Building Authority licensing, doesn’t need a permit, and works in rentals (with landlord approval for permanent seals; removable products for tenants).

Older weatherboards in coastal SE suburbs (Frankston, Mornington, Mt Eliza) face an extra challenge — salt air corrodes metal weather strips faster than inland. Use stainless-steel-backed seals or pure rubber/EPDM, not aluminium-channel products, if you’re within 5km of the bay.

Where Heat Actually Escapes

Step-by-Step: Draught-Proof Your Home in a Weekend

Step 1: Find the Leaks First

On a cold, still morning (under 10°C, no wind), close every external door and window. Light a long match or thin incense stick and slowly move it around door frames, window sashes, floor edges, power-point and switch faces on external walls, and skirting joins. Where the smoke bends or pulls, you’ve found a draught. Mark each spot with painter’s tape so you can prioritise.

For renters or anyone wanting hard data, a $40 hardware-store smoke pen or a hand-held infrared thermometer ($50–$80 from Total Tools) gives faster, repeatable results than incense.

Step 2: Seal External Door Frames

Start with the front and back doors — they leak the most. With the door open, run your finger along the rebate (the recessed lip the door closes against). Clean it with methylated spirits and a cloth, then cut self-adhesive EPDM foam tape to length and press it into the rebate. Close the door — if it’s hard to close, you chose too-thick a tape; step down a millimetre and re-do.

For the bottom of the door (the worst offender), fit a rubber compression seal screwed to the door bottom, or a brush-strip excluder if the floor is carpet. Cost: $20–$80 per door, twenty minutes work.

Step 3: Tackle Windows

Timber sash windows in older homes (typical of Frankston and Mornington Federation cottages) are the second-worst offenders. The sash sides, meeting rail, and bottom rail all need foam tape:

• Sash sides: 3mm EPDM tape pressed into the channel
• Meeting rail (where upper and lower sashes overlap): 6mm wool-pile draught strip on the inside edge
• Bottom rail: 6mm wool pile on the underside, pressed against the sill

Aluminium sliders need different products — a brush-strip insert that clips into the existing channel. Crucial: never seal weep holes (the small holes on the bottom track that drain rain water). Sealing them causes water pooling and frame rot.

Step 4: Seal Skirting Boards and Architraves

Run paintable acrylic gap filler along any gap wider than 1mm where skirting meets the floor or wall, and around door and window architraves. Wet your finger and smooth the bead within 30 seconds. Once dry (4–6 hours), paint to match. Don’t use silicone for paintable surfaces — paint won’t adhere and you’ll see ugly streaks forever.

For larger gaps (5mm+) around pipework entries under sinks, behind the toilet cistern, or where rangehood ducts pass through external walls, use expanding polyurethane foam in short bursts. It triples in volume, so don’t over-fill.

Step 5: Block the Chimney

An unused open fireplace pulls warm air up the chimney 24/7. A $35–$60 chimney balloon — inflated and wedged into the throat — stops 90% of that loss. Critical safety rule: the balloon must hang a tag visibly below the mantle. If anyone ever lights a fire without removing it, the balloon melts within seconds and the chimney back-fills the room with smoke and carbon monoxide.

Step 6: Address Exhaust Fans and Range Hoods

Ducted exhaust fans without back-draught flaps leak constantly. The DIY fix is a draught-stopper backdraft shutter ($25–$60) that fits in the ducting between the fan and the external vent. They open when the fan runs and close when it stops. Range hoods and bathroom fans both benefit.

Step 7: Seal Floor Gaps Under Skirtings

Suspended timber floors in pre-1970 homes often have 2–10mm gaps where the floorboards meet the wall under the skirting. Cold air from the subfloor pours in through these gaps. The fix is acrylic gap filler from below (if you can reach the subfloor) or pulling skirting boards off, laying a bead of caulk along the wall-floor join, and re-fixing.

Cheaper renter-friendly alternative: lay rubber-backed cork strips along the gap, then push the skirting tight against it.

Step 8: Power Points and Switch Plates on External Walls

Power outlets and light switches on external walls are surprisingly draughty — the cable hole in the wall plate lets subfloor or wall-cavity air through. Use foam gaskets ($2–$5 per outlet, sold as “outlet sealers”) between the plate and the wall. Five minutes per outlet.

Troubleshooting

When to Call a Professional

Draught-proofing itself is squarely a DIY job in Victoria — no licensing, no permits, no regulated trades required. However, three related upgrades need licensed help:

• New flue or vent penetrations through external walls: Builder or carpenter for structural cuts, electrician if wiring is moved.
• Gas heater work: Any modification to gas heaters or gas vents requires a Victorian Type A Gas Fitter (Victorian Building Authority licensed). Never seal a gas appliance flue.
• Underfloor insulation install: Not licensed per se, but a specialist installer ($40–$60/m² for R2.5 batts) is faster and safer than DIY under a low subfloor.

For older heritage-overlay homes in inner SE suburbs (parts of St Kilda, Brighton, Hampton), check with your council before fitting visible external products like brush-strip excluders — some heritage controls restrict door-bottom modifications.

Top 10 Tips and Gotchas

1. Ventilation isn’t optional. A well-sealed home needs deliberate ventilation — either trickle vents in windows, a heat-recovery ventilator, or a daily 5-minute window-open routine. Without it, condensation, mould, and indoor CO&sub2; build up fast.
2. Test before AND after. Repeat the smoke-pen test once you finish. A 70–90% reduction in flame deflection means you got the big leaks.
3. Avoid silicone on paintable surfaces. Use acrylic gap filler or hybrid polymer (Selleys No More Gaps or similar). Silicone refuses to take paint forever.
4. Don’t seal weep holes. Aluminium-frame windows and brick veneers have intentional drainage holes. Sealing them causes water damage that costs far more to fix than you save on heating.
5. Foam tape has a shelf life. EPDM foam lasts 10–15 years; PU (cheap) foam dries out and falls off in 2–3 years. Pay the extra dollar.
6. Re-test after the first cold snap. Materials shift slightly with temperature. Top up any gaps that re-open after the first frosty morning.
7. Renters: use removable products. Fabric door snakes, magnetic window seals, and clip-on brush excluders don’t damage paint or surfaces. Permanent caulking needs landlord permission.
8. Watch for back-draughts at the rangehood and bath fan. Hold a tissue against the vent indoors on a windy day — if it lifts, you need a backdraft shutter.
9. Coastal-zone homes need stainless or pure rubber seals. Within 5km of the bay (Frankston, Mornington), aluminium-channel seals corrode within 3 winters. Specify EPDM-only or stainless-backed.
10. Always disconnect power before touching outlets. A switch on a thicker external wall takes seconds longer to re-attach with a foam gasket. Don’t skip the circuit-breaker step.

Local Melbourne Resources

• Bunnings — EPDM tape, caulk, chimney balloons (Frankston, Pakenham, Cranbourne, Mornington stores)
• Mitre 10 — smaller specialist range, often better-quality wool-pile
• Total Tools — infrared thermometers, professional caulking guns, draught test kits
• Sustainability Victoria — free home-energy advice, rebate eligibility checks
• Victorian Energy Upgrades — potential rebates for draught-proofing through approved providers

FAQ

Final Thoughts

Draught-proofing is the cheapest, fastest, highest-ROI energy upgrade available to a Melbourne homeowner — full stop. $200 of materials, one weekend, no permits, no licensed trades, and savings every winter for a decade.

Here’s the bottom line:

• Start with external doors and windows — that’s 40–55% of total leakage
• Use EPDM foam, not cheap PU — it lasts 5× longer
• Don’t over-seal without planning ventilation — trickle vents or a daily 5-minute window-open
• Never seal anything that vents a gas appliance, combustion fireplace, or weep hole
• Re-test with a smoke pen after the first cold snap — small gaps re-open with temperature shift

Pair this work with: insulation cost guide, heater running cost comparison, and annual gas ducted heating service.

Bigger structural fixes — ceiling and wall insulation, double-glazing, underfloor batts — come later. Draught-proofing first — everything else builds on a sealed envelope.

See also on HomeUpkeep:

• How Much Does Draught-Proofing a House Cost in Melbourne?
• How to Draught-Proof Doors and Windows in Your Melbourne Home