He's even had to enlist the help of a trusty sidekick, Quake Kid - and a flatmobile - to keep up with demand, and continue with his work, conducted under the cloak of darkness.
Now, with a third winter already underway for the post-disaster city, Flat Man wants help in raising $10,000 so he can create winter packs and secretly deliver them to people who could do with them the most.
"New Zealand winter is hard enough, without having to live in garages and backs of cars," he says.
"Sometimes it takes too long for the help to get to where it is needed - it gets caught up in politics and people in suits and hard hats sitting around blaming each other.
"And before you think, 'Oh but it's been two-and-a-half years, who cares', come and talk to the people I've met and you'll understand just how hard it's been and continues to be.
"If I can do something to bring just a little joy to those in need, then why not? After all, that's what it's all about - getting out there and helping others in any way we're capable."
The University of Canterbury student from Christchurch, who was inspired by the Student Volunteer Army's work in the wake of the city's earthquakes, has designed his own Flat Man costume, lighting bolt logo, and has a popular Facebook profile.
Click here to learn more and support his crusade.