Gap Sealing and Draught Proofing: How to Slash Your Melbourne Winter Heating Bills

As Victoria moves toward higher energy efficiency standards for new builds, the older housing stock that makes up much of Melbourne's character-suburb housing is being left behind. In many Melbourne Victorian and Edwardian homes, the cumulative effect of air leaks through skirting boards, architraves, window frames, and plumbing entry points is equivalent to leaving a medium-sized window open all winter. Draught proofing is the single most cost-effective intervention available to these homeowners.

Where Your Heat Is Escaping

Most people focus on obvious draught sources, under doors and around window frames. But the most significant heat loss in older Melbourne homes often comes from less obvious locations.

• Skirting board gaps: The joint between the floor and the skirting board in homes with suspended timber floors sits directly above the sub-floor cavity, which is cold and often connected to outside air. This gap runs the entire perimeter of every room
• Architrave gaps: The junction between door and window frames and the surrounding plasterwork develops small cracks as timber moves seasonally. In aggregate across a whole house, these are significant
• Plumbing entry points: Gaps around pipes under sinks, behind washing machines, and at wall penetrations for gas lines are often left unsealed and connect directly to the sub-floor or exterior
• Cornices and ceiling junctions: In homes with suspended ceilings, the cornice line can have air movement from the roof cavity, particularly when the ceiling is not insulated
• Exhaust fan openings: Bathroom and kitchen exhaust fans without damper flaps draw cold air into the room continuously, even when not running

DIY Foam Strips vs. Professional Caulking

Hardware store foam weatherstripping and gap filler are better than nothing, but they have a limited lifespan in Melbourne's climate. The 20°C+ daily temperature swings of a Melbourne autumn compress and harden foam products within one or two seasons, restoring the original gap.

• Professional gap sealing uses high-flexibility polyurethane or silicone caulking compounds that are specifically formulated to move with the substrate, expanding and contracting with the timber without breaking the seal
• The correct compound varies by application: silicone for wet areas and window frames, paintable polyurethane for skirting and architraves, foam backer rod plus sealant for larger gaps
• A professional assessment identifies which gaps are contributing most to heat loss and prioritises them, not all gaps are equal, and a targeted approach gives the best return on investment

The Financial Payoff

A professionally draught-sealed Melbourne home typically sees a reduction of $200–$400 per year in winter heating costs, depending on the size of the home, the extent of air leakage, and the heating fuel type. The work pays for itself within one to three winters and continues delivering savings annually thereafter.

• Homes with ducted gas heating benefit most, as the system runs shorter cycles to maintain the set temperature in a sealed space
• Improved thermal comfort, fewer cold spots and draughts, also reduces the tendency to overheat the whole house to compensate for one uncomfortable area
• Draught sealing also reduces the amount of cold, dry outside air entering the home, which improves comfort and can reduce condensation on windows

Our gap sealing and caulking service covers skirting boards, window frames, door architraves, and plumbing penetrations across Melbourne. Work completed now will be doing its job from the first cold night. Don't get caught in the cold. Book your professional Melbourne property service with Spot On today.