When winter rolls around in New Zealand, most of us reach for the heat pump remote without thinking twice. But if your windows are letting in draughts, you could be paying to warm the outdoors.
A surprising amount of household heat loss comes not from thin walls or poor insulation, but from small, hidden gaps around windows and frames. That’s where weatherstripping window seals come in a simple, low-cost upgrade that can make your home noticeably warmer, quieter, and cheaper to run.
Weatherstripping refers to any material used to seal the gaps where window sashes or frames meet. The idea is to block unwanted air movement while still allowing windows to open and close smoothly.
Common materials include rubber, foam, silicone, vinyl, and brush seals, each designed to compress slightly when the window shuts, creating an airtight barrier that keeps warm air in and cold air out.
According to the Energy Efficiency and Conservation Authority (EECA), up to 35 % of a home’s heat loss occurs through windows and doors. Even a few millimetres of air leakage can undermine the insulation in your walls and ceiling.
By properly sealing those gaps, weatherstripping can:
With New Zealand’s electricity prices continuing to rise, sealing your windows is one of the easiest ways to cut costs without compromising comfort.
Think of it as adding a soft gasket around your window. When you close the window, the seal compresses, filling gaps that would otherwise let air, moisture, and sound through.
In winter, it keeps warm air in and draughts out. In summer, it prevents hot air and dust from sneaking inside.
The result is a home that stays comfortable with less reliance on heating or cooling, reducing both your power bill and carbon footprint.
There are plenty of weatherstripping options on the market, but for lasting performance and compatibility with New Zealand conditions, we recommend the following solutions available through Doric’s Weather Stripping and Seals range:
Visit Our Weather Stripping & Seals Range to explore our window and door sealing solutions.
You might not see a gap, but you’ll definitely feel it. Check your windows for these common signs:
A simple DIY test is to close a sheet of paper in the window, if it slides out easily, the seal isn’t tight enough.
Most homeowners can install adhesive foam or brush seals with a few basic tools:
If your windows are warped or you’re unsure which material suits your joinery, it’s worth calling a professional glazier or insulation specialist.
Weatherstripping may not look like a major upgrade, but it’s one of the best returns on investment for home comfort.
If you’re unsure which seal is right for your windows or doors, get in touch with with us for expert advice and to explore their full range of weatherstripping solutions designed for New Zealand conditions.
Most good-quality rubber or silicone seals last 5–10 years, while foam strips may need replacing every 1–2 years depending on exposure.
Yes, adhesive foam and brush seals are easy DIY options. For silicone or compression seals, professional installation ensures a tighter, longer-lasting fit.
No. It seals unintentional leaks, not your home’s designed ventilation. Kitchens and bathrooms will still vent normally.
Absolutely. Even double-glazed windows lose efficiency if the frame isn’t sealed properly. Weatherstripping complements double glazing for maximum insulation.
Your window should close firmly with no movement or rattling. You’ll also notice fewer draughts, less condensation, and a more stable indoor temperature.
