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Ember attack, not the flame front, is the most common cause of bushfire damage to buildings, and embers get in through gaps, so the garage door check worth doing this season is its bottom, side and top seals against YourHome's guidance of gaps no more than 2 mm for external openings, with the threshold kept clear of anything that burns.
NSW keeps its current building code until NCC 2025 takes over next year, and the new edition changes little for an ordinary garage: housing energy efficiency is effectively unchanged, and the garage-door wind clause applies only in wind regions the code labels cyclonic.
A damaging wind warning means the Bureau of Meteorology expects gusts of 90 km/h or more, well short of its destructive tier but strong enough to lift roof tiles and snap branches, so when one is issued, close and secure your garage door, clear the driveway, and check the door once the storm has passed.